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<?xml version='1.0' encoding='UTF-8'?>
<!-- This document was created with Syntext Serna Free. --><!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "docbookV4.5/docbookx.dtd" []>
<chapter id="chap-Administration_Guide-Monitor_Workload">
  <title>Monitoring your GlusterFS Workload</title>
  <para>You can monitor the GlusterFS volumes on different parameters. Monitoring volumes helps  in capacity planning and performance tuning tasks of the GlusterFS volume. Using these information, you can identify and troubleshoot issues. </para>
  <para>You can use Volume Top and Profile commands to view the performance and identify bottlenecks/hotspots of each brick of a volume. This helps system administrators to get vital performance information whenever performance needs to be probed. </para>
  <para>You can also perform statedump of the brick processes and nfs server process of a volume, and also view volume status and volume information.  </para>
  <section id="chap-Administration_Guide-Monitor_Workload-Profile">
    <title>Running GlusterFS Volume Profile Command</title>
    <para>GlusterFS Volume Profile command provides an interface to get the per-brick I/O information for each File Operation (FOP) of a volume. The per brick information helps in identifying bottlenecks in the storage system. 
</para>
    <para>This section describes how to run GlusterFS Volume Profile command by performing the following operations:
</para>
    <itemizedlist>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Profile-Start"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Profile-Display"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Profile-Stop"/></para>
      </listitem>
    </itemizedlist>
    <section id="chap-Administration_Guide-Monitor_Workload-Profile-Start">
      <title>Start Profiling</title>
      <para>You must start the Profiling to view the File Operation information for each brick.
</para>
      <para><emphasis role="bold">To start profiling: </emphasis></para>
      <itemizedlist>
        <listitem>
          <para>Start profiling using the following command:
 </para>
        </listitem>
      </itemizedlist>
      <para><command># gluster volume profile <replaceable>VOLNAME</replaceable> start </command></para>
      <para>For example, to start profiling on test-volume:
</para>
      <para><programlisting># gluster volume profile test-volume start
Profiling started on test-volume</programlisting></para>
      <para>When profiling on the volume is started, the following additional options are displayed in the Volume Info:
</para>
      <para><programlisting>diagnostics.count-fop-hits: on

diagnostics.latency-measurement: on</programlisting></para>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Profile-Display">
      <title>Displaying the I/0 Information</title>
      <para>You can view the I/O information of each brick. 
</para>
      <para>To display I/O information:
</para>
      <itemizedlist>
        <listitem>
          <para>Display the I/O information using the following command:
</para>
        </listitem>
      </itemizedlist>
      <para><command># gluster volume profile <replaceable>VOLNAME</replaceable> info</command>

</para>
      <para>For example, to see the I/O information on test-volume:

</para>
      <para><programlisting># gluster volume profile test-volume info
Brick: Test:/export/2
Cumulative Stats:

Block                     1b+           32b+           64b+
Size:
       Read:                0              0              0
       Write:             908             28              8

Block                   128b+           256b+         512b+
Size:
       Read:                0               6             4
       Write:               5              23            16

Block                  1024b+          2048b+        4096b+
Size:
       Read:                 0              52           17
       Write:               15             120          846

Block                   8192b+         16384b+      32768b+
Size:
       Read:                52               8           34
       Write:              234             134          286

Block                                  65536b+     131072b+
Size:
       Read:                               118          622
       Write:                             1341          594


%-latency  Avg-      Min-       Max-       calls     Fop
          latency   Latency    Latency  
___________________________________________________________
4.82      1132.28   21.00      800970.00   4575    WRITE
5.70       156.47    9.00      665085.00   39163   READDIRP
11.35      315.02    9.00     1433947.00   38698   LOOKUP
11.88     1729.34   21.00     2569638.00    7382   FXATTROP
47.35   104235.02 2485.00     7789367.00     488   FSYNC

------------------

------------------

Duration     : 335

BytesRead    : 94505058

BytesWritten : 195571980</programlisting></para>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Profile-Stop">
      <title>Stop Profiling</title>
      <para>You can stop profiling the volume, if you do not need profiling information anymore.
</para>
      <para><emphasis role="bold">To stop profiling</emphasis>
</para>
      <itemizedlist>
        <listitem>
          <para>Stop profiling using the following command:
</para>
          <para><command># gluster volume profile <replaceable>VOLNAME</replaceable> stop</command>
</para>
          <para>For example, to stop profiling on test-volume:</para>
          <para><command># gluster volume profile <replaceable>test-volume</replaceable> stop</command> </para>
          <para><computeroutput>Profiling stopped on test-volume</computeroutput></para>
        </listitem>
      </itemizedlist>
    </section>
  </section>
  <section id="chap-Administration_Guide-Monitor_Workload-Top">
    <title> Running GlusterFS Volume TOP Command </title>
    <para>GlusterFS Volume Top command allows you to view the glusterfs bricks’ performance metrics like
read, write, file open calls, file read calls, file write calls, directory open calls, and directory real
calls. The top command displays up to 100 results.
</para>
    <para>This section describes how to run and view the results for the following GlusterFS Top commands:
</para>
    <itemizedlist>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-Open_FD_Count"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-File_Read"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-File_Write"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-Open_Calls"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-Read_Calls"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-Read_Perf"/></para>
      </listitem>
      <listitem>
        <para><xref linkend="chap-Administration_Guide-Monitor_Workload-Top-Write_Perf"/></para>
      </listitem>
    </itemizedlist>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-Open_FD_Count">
      <title>Viewing Open fd Count and Maximum fd Count </title>
      <para>You can view both current open fd count (list of files that are currently the most opened and the
count) on the brick and the maximum open fd count (count of files that are the currently open and
the count of maximum number of files opened at any given point of time, since the servers are up
and running). If the brick name is not specified, then open fd metrics of all the bricks belonging to
the volume will be displayed.
</para>
      <para><emphasis role="bold">To view open fd count and maximum fd count: </emphasis></para>
      <itemizedlist>
        <listitem>
          <para>View open fd count and maximum fd count using the following command:</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> open [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>]</command>
</para>
          <para>For example, to view open fd count and maximum fd count on brick <replaceable>server:/export</replaceable> of <replaceable>test-volume</replaceable> and list top 10 open calls:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> open brick <replaceable>server:/export/</replaceable> list-cnt <replaceable>10</replaceable></command></para>
          <para><computeroutput>Brick: server:/export/dir1 </computeroutput></para>
          <para><computeroutput>Current open fd&apos;s: 34 Max open fd&apos;s: 209 </computeroutput><programlisting>             ==========Open file stats========

open            file name
call count     

2               /clients/client0/~dmtmp/PARADOX/
                COURSES.DB

11              /clients/client0/~dmtmp/PARADOX/
                ENROLL.DB

11              /clients/client0/~dmtmp/PARADOX/
                STUDENTS.DB

10              /clients/client0/~dmtmp/PWRPNT/
                TIPS.PPT

10              /clients/client0/~dmtmp/PWRPNT/
                PCBENCHM.PPT

9               /clients/client7/~dmtmp/PARADOX/
                STUDENTS.DB

9               /clients/client1/~dmtmp/PARADOX/
                STUDENTS.DB

9               /clients/client2/~dmtmp/PARADOX/
                STUDENTS.DB

9               /clients/client0/~dmtmp/PARADOX/
                STUDENTS.DB

9               /clients/client8/~dmtmp/PARADOX/
                STUDENTS.DB</programlisting></para>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-File_Read">
      <title>Viewing Highest File Read Calls </title>
      <para>You can view highest read calls on each brick. If brick name is not specified, then by default, list of
100 files will be displayed.
</para>
      <para><emphasis role="bold">To view highest file Read calls:</emphasis>
</para>
      <itemizedlist>
        <listitem>
          <para>View highest file Read calls using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> read [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>] </command></para>
          <para>For example, to view highest Read calls on brick server:/export of test-volume:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> read brick <replaceable>server:/export</replaceable> list-cnt <replaceable>10</replaceable></command></para>
          <para><computeroutput>Brick:</computeroutput> <replaceable>server:/export/dir1</replaceable><programlisting>          ==========Read file stats========

read              filename
call count

116              /clients/client0/~dmtmp/SEED/LARGE.FIL

64               /clients/client0/~dmtmp/SEED/MEDIUM.FIL

54               /clients/client2/~dmtmp/SEED/LARGE.FIL

54               /clients/client6/~dmtmp/SEED/LARGE.FIL

54               /clients/client5/~dmtmp/SEED/LARGE.FIL

54               /clients/client0/~dmtmp/SEED/LARGE.FIL

54               /clients/client3/~dmtmp/SEED/LARGE.FIL

54               /clients/client4/~dmtmp/SEED/LARGE.FIL

54               /clients/client9/~dmtmp/SEED/LARGE.FIL

54               /clients/client8/~dmtmp/SEED/LARGE.FIL</programlisting> </para>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-File_Write">
      <title>Viewing Highest File Write Calls </title>
      <para>You can view list of files which has highest file write calls on each brick. If brick name is not
specified, then by default, list of 100 files will be displayed.
</para>
      <para><emphasis role="bold">To view highest file Write calls:</emphasis>
</para>
      <itemizedlist>
        <listitem>
          <para>View highest file Write calls using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> write [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>] </command></para>
          <para>For example, to view highest Write calls on brick <replaceable>server:/export</replaceable> of <replaceable>test-volume</replaceable>:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> write brick <replaceable>server:/export</replaceable> list-cnt <replaceable>10</replaceable></command></para>
          <para><code>Brick: server:/export/dir1 </code><programlisting>               ==========Write file stats========
write call count   filename

83                /clients/client0/~dmtmp/SEED/LARGE.FIL

59                /clients/client7/~dmtmp/SEED/LARGE.FIL

59                /clients/client1/~dmtmp/SEED/LARGE.FIL

59                /clients/client2/~dmtmp/SEED/LARGE.FIL

59                /clients/client0/~dmtmp/SEED/LARGE.FIL

59                /clients/client8/~dmtmp/SEED/LARGE.FIL

59                /clients/client5/~dmtmp/SEED/LARGE.FIL

59                /clients/client4/~dmtmp/SEED/LARGE.FIL

59                /clients/client6/~dmtmp/SEED/LARGE.FIL

59                /clients/client3/~dmtmp/SEED/LARGE.FIL</programlisting></para>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-Open_Calls">
      <title>Viewing Highest Open Calls on Directories </title>
      <para>You can view list of files which has highest open calls on directories of each brick. If brick name is
not specified, then the metrics of all the bricks belonging to that volume will be displayed.
</para>
      <para>To view list of open calls on each directory</para>
      <itemizedlist>
        <listitem>
          <para>View list of open calls on each directory using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> opendir [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>] </command></para>
          <para>For example, to view open calls on brick server:/export/ of test-volume:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> opendir brick <replaceable>server:/export</replaceable> list-cnt <replaceable>10</replaceable></command></para>
          <para><code>Brick: server:/export/dir1 </code><programlisting>         ==========Directory open stats========

Opendir count     directory name

1001              /clients/client0/~dmtmp

454               /clients/client8/~dmtmp

454               /clients/client2/~dmtmp
 
454               /clients/client6/~dmtmp

454               /clients/client5/~dmtmp

454               /clients/client9/~dmtmp

443               /clients/client0/~dmtmp/PARADOX

408               /clients/client1/~dmtmp

408               /clients/client7/~dmtmp

402               /clients/client4/~dmtmp</programlisting></para>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-Read_Calls">
      <title>Viewing Highest Read Calls on Directory </title>
      <para>You can view list of files which has highest directory read calls on each brick. If brick name is not
specified, then the metrics of all the bricks belonging to that volume will be displayed.
</para>
      <para><emphasis role="bold">To view list of highest directory read calls on each brick</emphasis>
</para>
      <itemizedlist>
        <listitem>
          <para>View list of highest directory read calls on each brick using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> readdir [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>] </command></para>
          <para>For example, to view highest directory read calls on brick <replaceable>server:/export</replaceable> of <replaceable>test-volume</replaceable>:</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> readdir brick <replaceable>server:/export</replaceable> list-cnt <replaceable>10</replaceable></command> </para>
          <para><code>Brick: <replaceable>server:/export/dir1</replaceable></code><programlisting>==========Directory readdirp stats========

readdirp count           directory name

1996                    /clients/client0/~dmtmp

1083                    /clients/client0/~dmtmp/PARADOX

904                     /clients/client8/~dmtmp

904                     /clients/client2/~dmtmp

904                     /clients/client6/~dmtmp

904                     /clients/client5/~dmtmp

904                     /clients/client9/~dmtmp

812                     /clients/client1/~dmtmp

812                     /clients/client7/~dmtmp

800                     /clients/client4/~dmtmp</programlisting>
</para>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-Read_Perf">
      <title>Viewing List of Read Performance on each Brick </title>
      <para>You can view the read throughput of files on each brick. If brick name is not specified, then the
metrics of all the bricks belonging to that volume will be displayed. The output will be the read
throughput.
</para>
      <para><programlisting>       ==========Read throughput file stats========

read         filename                         Time
through
put(MBp
s)
 
2570.00    /clients/client0/~dmtmp/PWRPNT/      -2011-01-31
           TRIDOTS.POT                      15:38:36.894610  
2570.00    /clients/client0/~dmtmp/PWRPNT/      -2011-01-31
           PCBENCHM.PPT                     15:38:39.815310                                                             
2383.00    /clients/client2/~dmtmp/SEED/        -2011-01-31
           MEDIUM.FIL                       15:52:53.631499
                                              
2340.00    /clients/client0/~dmtmp/SEED/        -2011-01-31
           MEDIUM.FIL                       15:38:36.926198
                                              
2299.00   /clients/client0/~dmtmp/SEED/         -2011-01-31
          LARGE.FIL                         15:38:36.930445
                                             
2259.00   /clients/client0/~dmtmp/PARADOX/      -2011-01-31
          COURSES.X04                       15:38:40.549919

2221.00   /clients/client0/~dmtmp/PARADOX/      -2011-01-31
          STUDENTS.VAL                      15:52:53.298766
                                              
2221.00   /clients/client3/~dmtmp/SEED/         -2011-01-31
          COURSES.DB                        15:39:11.776780

2184.00   /clients/client3/~dmtmp/SEED/         -2011-01-31
          MEDIUM.FIL                        15:39:10.251764
                                              
2184.00   /clients/client5/~dmtmp/WORD/         -2011-01-31
          BASEMACH.DOC                      15:39:09.336572                                          </programlisting>This command will initiate a dd for the specified count and block size and measures the
corresponding throughput.
</para>
      <para><emphasis role="bold">To view list of read performance on each brick</emphasis>
</para>
      <itemizedlist>
        <listitem>
          <para>View list of read performance on each brick using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> read-perf [bs <replaceable>blk-size</replaceable> count <replaceable>count</replaceable>] [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>]</command>
</para>
          <para>For example, to view read performance on brick server:/export/ of test-volume, 256 block size
of count 1, and list count 10:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> read-perf bs 256 count 1 brick <replaceable>server:/export/ </replaceable>list-cnt <replaceable>10</replaceable></command></para>
          <para><computeroutput>Brick: server:/export/dir1 256 bytes (256 B) copied, Throughput: 4.1 MB/s </computeroutput></para>
          <programlisting>       ==========Read throughput file stats========

read         filename                         Time
through
put(MBp
s)

2912.00   /clients/client0/~dmtmp/PWRPNT/    -2011-01-31
           TRIDOTS.POT                   15:38:36.896486
                                           
2570.00   /clients/client0/~dmtmp/PWRPNT/    -2011-01-31
           PCBENCHM.PPT                  15:38:39.815310
                                           
2383.00   /clients/client2/~dmtmp/SEED/      -2011-01-31
           MEDIUM.FIL                    15:52:53.631499
                                           
2340.00   /clients/client0/~dmtmp/SEED/      -2011-01-31
           MEDIUM.FIL                    15:38:36.926198

2299.00   /clients/client0/~dmtmp/SEED/      -2011-01-31
           LARGE.FIL                     15:38:36.930445
                                                      
2259.00  /clients/client0/~dmtmp/PARADOX/    -2011-01-31
          COURSES.X04                    15:38:40.549919
                                           
2221.00  /clients/client9/~dmtmp/PARADOX/    -2011-01-31
          STUDENTS.VAL                   15:52:53.298766
                                           
2221.00  /clients/client8/~dmtmp/PARADOX/    -2011-01-31
         COURSES.DB                      15:39:11.776780
                                           
2184.00  /clients/client3/~dmtmp/SEED/       -2011-01-31
          MEDIUM.FIL                     15:39:10.251764
                                           
2184.00  /clients/client5/~dmtmp/WORD/       -2011-01-31
         BASEMACH.DOC                    15:39:09.336572
                                           </programlisting>
        </listitem>
      </itemizedlist>
    </section>
    <section id="chap-Administration_Guide-Monitor_Workload-Top-Write_Perf">
      <title>Viewing List of Write Performance on each Brick </title>
      <para>You can view list of write throughput of files on each brick. If brick name is not specified, then the
metrics of all the bricks belonging to that volume will be displayed. The output will be the write
throughput.
</para>
      <para>This command will initiate a dd for the specified count and block size and measures the
corresponding throughput.
To view list of write performance on each brick:
</para>
      <itemizedlist>
        <listitem>
          <para>View list of write performance on each brick using the following command:
</para>
          <para><command># gluster volume top <replaceable>VOLNAME</replaceable> write-perf [bs <replaceable>blk-size</replaceable> count <replaceable>count</replaceable>] [brick <replaceable>BRICK-NAME</replaceable>] [list-cnt <replaceable>cnt</replaceable>] </command></para>
          <para>For example, to view write performance on brick <replaceable>server:/export/</replaceable> of <replaceable>test-volume</replaceable>, 256 block size
of count 1, and list count 10:
</para>
          <para><command># gluster volume top <replaceable>test-volume</replaceable> write-perf bs 256 count 1 brick <replaceable>server:/export/ </replaceable>list-cnt <replaceable>10</replaceable></command></para>
          <para><code>Brick</code>: <replaceable>server:/export/dir1</replaceable>
</para>
          <para><code>256 bytes (256 B) copied, Throughput: 2.8 MB/s </code><programlisting>       ==========Write throughput file stats========

write                filename                 Time
throughput
(MBps)
 
1170.00    /clients/client0/~dmtmp/SEED/     -2011-01-31
           SMALL.FIL                     15:39:09.171494

1008.00    /clients/client6/~dmtmp/SEED/     -2011-01-31
           LARGE.FIL                      15:39:09.73189

949.00    /clients/client0/~dmtmp/SEED/      -2011-01-31
          MEDIUM.FIL                     15:38:36.927426

936.00   /clients/client0/~dmtmp/SEED/       -2011-01-31
         LARGE.FIL                        15:38:36.933177    
897.00   /clients/client5/~dmtmp/SEED/       -2011-01-31
         MEDIUM.FIL                       15:39:09.33628

897.00   /clients/client6/~dmtmp/SEED/       -2011-01-31
         MEDIUM.FIL                       15:39:09.27713

885.00   /clients/client0/~dmtmp/SEED/       -2011-01-31
          SMALL.FIL                      15:38:36.924271

528.00   /clients/client5/~dmtmp/SEED/       -2011-01-31
         LARGE.FIL                        15:39:09.81893

516.00   /clients/client6/~dmtmp/ACCESS/    -2011-01-31
         FASTENER.MDB                    15:39:01.797317
</programlisting></para>
        </listitem>
      </itemizedlist>
    </section>
  </section>
  <section id="sect-Administration_Guide-Monitor_Workload-Displaying_Volume_Information">
    <title>Displaying Volume Information </title>
    <para>You can display information about a specific volume, or all volumes, as needed.</para>
    <para><emphasis role="bold">To display volume information </emphasis></para>
    <itemizedlist>
      <listitem>
        <para>Display information about a specific volume using the following command:</para>
        <para><command># gluster volume info </command><varname>VOLNAME</varname></para>
        <para>For example, to display information about test-volume:</para>
        <para><programlisting># gluster volume info test-volume
Volume Name: test-volume
Type: Distribute
Status: Created
Number of Bricks: 4
Bricks:
Brick1: server1:/exp1
Brick2: server2:/exp2
Brick3: server3:/exp3
Brick4: server4:/exp4</programlisting></para>
      </listitem>
      <listitem>
        <para>Display information about all volumes using the following command:</para>
        <para><command># gluster volume info all</command></para>
        <para><programlisting># gluster volume info all

Volume Name: test-volume
Type: Distribute
Status: Created
Number of Bricks: 4
Bricks:
Brick1: server1:/exp1
Brick2: server2:/exp2
Brick3: server3:/exp3
Brick4: server4:/exp4

Volume Name: mirror
Type: Distributed-Replicate
Status: Started
Number of Bricks: 2 X 2 = 4
Bricks:
Brick1: server1:/brick1
Brick2: server2:/brick2
Brick3: server3:/brick3
Brick4: server4:/brick4

Volume Name: Vol
Type: Distribute
Status: Started
Number of Bricks: 1
Bricks:
Brick: server:/brick6

</programlisting></para>
      </listitem>
    </itemizedlist>
  </section>
  <section id="sect-Administration_Guide-Monitor_Workload-Performing_Statedump">
    <title>Performing Statedump on a Volume </title>
    <para>Statedump is a mechanism through which you can get details of  all internal variables and state of the glusterfs process at the time of  issuing the command.You can perform statedumps of the brick processes and nfs server process of a volume using the statedump command. The following options can be used to determine what information is to be dumped:</para>
    <itemizedlist>
      <listitem>
        <para><emphasis role="bold">mem</emphasis> - Dumps the  memory usage and memory pool details of the bricks.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">iobuf</emphasis> - Dumps iobuf details of the bricks.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">priv</emphasis> -  Dumps private information of loaded translators.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">callpool</emphasis> - Dumps the  pending calls of the volume.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">fd</emphasis> - Dumps the open fd tables of the volume.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">inode</emphasis> - Dumps the inode tables of the volume.</para>
      </listitem>
    </itemizedlist>
    <para><emphasis role="bold">To display volume statedump </emphasis></para>
    <itemizedlist>
      <listitem>
        <para>Display statedump of a  volume or NFS server using the following command:</para>
        <para> <command># gluster volume statedump <replaceable>VOLNAME</replaceable> [nfs] [all|mem|iobuf|callpool|priv|fd|inode]</command></para>
        <para>For example, to display statedump of test-volume:</para>
        <para><programlisting># gluster volume statedump test-volume
Volume statedump successful</programlisting></para>
        <para>The  statedump files are created on the brick servers in the<filename> /tmp</filename> directory or in the directory set using <command>server.statedump-path</command> volume  option.  The naming convention of the dump file is <filename>&lt;brick-path&gt;.&lt;brick-pid&gt;.dump</filename>.</para>
      </listitem>
      <listitem>
        <para>By defult, the output of the statedump  is stored at <filename> /tmp/&lt;brickname.PID.dump&gt;</filename> file on that particular server. Change the directory of the statedump file  using the following command:</para>
        <para><command># gluster volume set <replaceable>VOLNAME</replaceable> server.statedump-path <replaceable>path</replaceable></command></para>
        <para>For example,  to change the location of the statedump file of test-volume:</para>
        <para><programlisting># gluster volume set test-volume server.statedump-path /usr/local/var/log/glusterfs/dumps/
Set volume successful</programlisting></para>
        <para>You can view the changed  path of the statedump file using the following command:</para>
        <para><command># gluster volume info <replaceable>VOLNAME</replaceable></command></para>
      </listitem>
    </itemizedlist>
  </section>
  <section id="sect-Administration_Guide-Monitor_Workload-Displaying_Volume_Status">
    <title>Displaying Volume Status </title>
    <para>You can display the status information about a specific volume, brick  or all volumes, as needed. Status information can be used to understand the current status of the brick,  nfs processes, and overall file system. Status information can also be used to monitor and debug the volume information. You can view status of the volume along with the  following details:</para>
    <itemizedlist>
      <listitem>
        <para><emphasis role="bold">detail</emphasis> -  Displays additional information about the bricks.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">clients</emphasis> -  Displays the list of clients connected to the volume.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">mem</emphasis> - Displays the memory usage and memory pool details of the bricks.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">inode</emphasis> - Displays the inode tables of the volume.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">fd</emphasis> - Displays the open fd (file descriptors) tables of the volume.</para>
      </listitem>
      <listitem>
        <para><emphasis role="bold">callpool</emphasis> - Displays the  pending calls  of the volume.</para>
      </listitem>
    </itemizedlist>
    <para><emphasis role="bold">To display volume status </emphasis></para>
    <itemizedlist>
      <listitem>
        <para>Display information about a specific volume using the following command:</para>
        <para><command># gluster volume status [all|<replaceable>VOLNAME</replaceable> [<replaceable>BRICKNAME</replaceable>]] [detail|clients|mem|inode|fd|callpool]</command> </para>
        <para>For example, to display information about test-volume:</para>
        <para><programlisting># gluster volume status test-volume
STATUS OF VOLUME: test-volume
BRICK                           PORT   ONLINE   PID
--------------------------------------------------------
arch:/export/1                  24009   Y       22445
--------------------------------------------------------
arch:/export/2                  24010   Y       22450</programlisting></para>
      </listitem>
      <listitem>
        <para>Display information about all volumes using the following command:</para>
        <para><command># gluster volume status all</command>
</para>
        <para><programlisting># gluster volume status all
STATUS OF VOLUME: volume-test
BRICK                           PORT   ONLINE   PID
--------------------------------------------------------
arch:/export/4                  24010   Y       22455

STATUS OF VOLUME: test-volume
BRICK                           PORT   ONLINE   PID
--------------------------------------------------------
arch:/export/1                  24009   Y       22445
--------------------------------------------------------
arch:/export/2                  24010   Y       22450</programlisting></para>
      </listitem>
      <listitem>
        <para>Display additional information about the bricks  using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> detail</command>
</para>
        <para>For example, to display additional information about the bricks of test-volume:</para>
        <para><programlisting># gluster volume status test-volume details
STATUS OF VOLUME: test-volume
-------------------------------------------
Brick                : arch:/export/1      
Port                 : 24009              
Online               : Y                  
Pid                  : 16977              
File System          : rootfs              
Device               : rootfs              
Mount Options        : rw                  
Disk Space Free      : 13.8GB              
Total Disk Space     : 46.5GB              
Inode Size           : N/A                
Inode Count          : N/A                
Free Inodes          : N/A

Number of Bricks: 1
Bricks:
Brick: server:/brick6</programlisting></para>
      </listitem>
      <listitem>
        <para>Display the list of clients accessing the volumes using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> clients</command>
</para>
        <para>For example, to display the list of clients connected to test-volume:</para>
        <para><programlisting># gluster volume status test-volume clients
Brick : arch:/export/1
Clients connected : 2
Hostname          Bytes Read   BytesWritten
--------          ---------    ------------
127.0.0.1:1013    776          676
127.0.0.1:1012    50440        51200</programlisting></para>
      </listitem>
      <listitem>
        <para>Display the  memory usage and memory pool details of the bricks  using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> mem</command>
</para>
        <para>For example, to display the   memory usage and memory pool details of the bricks of test-volume:</para>
        <screen>Memory status for volume : test-volume
----------------------------------------------
Brick : arch:/export/1
Mallinfo
--------
Arena    : 434176
Ordblks  : 2
Smblks   : 0
Hblks    : 12
Hblkhd   : 40861696
Usmblks  : 0
Fsmblks  : 0
Uordblks : 332416
Fordblks : 101760
Keepcost : 100400

Mempool Stats
-------------
Name                               HotCount ColdCount PaddedSizeof AllocCount MaxAlloc
----                               -------- --------- ------------ ---------- --------
test-volume-server:fd_t                0     16384           92         57        5
test-volume-server:dentry_t           59       965           84         59       59
test-volume-server:inode_t            60       964          148         60       60
test-volume-server:rpcsvc_request_t    0       525         6372        351        2
glusterfs:struct saved_frame           0      4096          124          2        2
glusterfs:struct rpc_req               0      4096         2236          2        2
glusterfs:rpcsvc_request_t             1       524         6372          2        1
glusterfs:call_stub_t                  0      1024         1220        288        1
glusterfs:call_stack_t                 0      8192         2084        290        2
glusterfs:call_frame_t                 0     16384          172       1728        6</screen>
      </listitem>
      <listitem>
        <para>Display the inode tables of the volume using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> inode</command>
</para>
        <para>For example, to display the inode tables of the  test-volume:</para>
        <para><programlisting># gluster volume status test-volume inode
inode tables for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Active inodes:
GFID                                            Lookups            Ref   IA type
----                                            -------            ---   -------
6f3fe173-e07a-4209-abb6-484091d75499                  1              9         2
370d35d7-657e-44dc-bac4-d6dd800ec3d3                  1              1         2

LRU inodes: 
GFID                                            Lookups            Ref   IA type
----                                            -------            ---   -------
80f98abe-cdcf-4c1d-b917-ae564cf55763                  1              0         1
3a58973d-d549-4ea6-9977-9aa218f233de                  1              0         1
2ce0197d-87a9-451b-9094-9baa38121155                  1              0         2</programlisting></para>
      </listitem>
      <listitem>
        <para>Display the open fd tables of the volume using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> fd</command>
</para>
        <para>For example, to display the open fd tables of the   test-volume:</para>
        <para><screen># gluster volume status test-volume fd

FD tables for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Connection 1:
RefCount = 0  MaxFDs = 128  FirstFree = 4
FD Entry            PID                 RefCount            Flags              
--------            ---                 --------            -----              
0                   26311               1                   2                  
1                   26310               3                   2                  
2                   26310               1                   2                  
3                   26311               3                   2                  
 
Connection 2:
RefCount = 0  MaxFDs = 128  FirstFree = 0
No open fds
 
Connection 3:
RefCount = 0  MaxFDs = 128  FirstFree = 0
No open fds</screen></para>
      </listitem>
      <listitem>
        <para>Display the  pending calls of the volume  using the following command:</para>
        <para><command># gluster volume status <replaceable>VOLNAME</replaceable> callpool</command>
</para>
        <para>Each call has a call stack containing call frames.</para>
        <para>For example, to display the  pending calls of   test-volume:</para>
        <para><programlisting># gluster volume status test-volume

Pending calls for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Pending calls: 2
Call Stack1
 UID    : 0
 GID    : 0
 PID    : 26338
 Unique : 192138
 Frames : 7
 Frame 1
  Ref Count   = 1
  Translator  = test-volume-server
  Completed   = No
 Frame 2
  Ref Count   = 0
  Translator  = test-volume-posix
  Completed   = No
  Parent      = test-volume-access-control
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)-&gt;fops-&gt;fsync
 Frame 3
  Ref Count   = 1
  Translator  = test-volume-access-control
  Completed   = No
  Parent      = repl-locks
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)-&gt;fops-&gt;fsync
 Frame 4
  Ref Count   = 1
  Translator  = test-volume-locks
  Completed   = No
  Parent      = test-volume-io-threads
  Wind From   = iot_fsync_wrapper
  Wind To     = FIRST_CHILD (this)-&gt;fops-&gt;fsync
 Frame 5
  Ref Count   = 1
  Translator  = test-volume-io-threads
  Completed   = No
  Parent      = test-volume-marker
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)-&gt;fops-&gt;fsync
 Frame 6
  Ref Count   = 1
  Translator  = test-volume-marker
  Completed   = No
  Parent      = /export/1
  Wind From   = io_stats_fsync
  Wind To     = FIRST_CHILD(this)-&gt;fops-&gt;fsync
 Frame 7
  Ref Count   = 1
  Translator  = /export/1
  Completed   = No
  Parent      = test-volume-server
  Wind From   = server_fsync_resume
  Wind To     = bound_xl-&gt;fops-&gt;fsync</programlisting></para>
      </listitem>
    </itemizedlist>
  </section>
</chapter>