Added all files

15 files changed, 654 insertions, 0 deletions

diff --git a/doc/examples/Makefile.am b/doc/examples/Makefile.am
new file mode 100644
index 000000000..b4c93f4c9
--- /dev/null
+++ b/doc/examples/Makefile.am
@@ -0,0 +1,8 @@
+EXTRA = README unify.vol replicate.vol stripe.vol protocol-client.vol protocol-server.vol posix-locks.vol trash.vol write-behind.vol io-threads.vol io-cache.vol read-ahead.vol filter.vol trace.vol
+EXTRA_DIST = $(EXTRA)
+
+docdir = $(datadir)/doc/$(PACKAGE_NAME)
+Examplesdir = $(docdir)/examples
+Examples_DATA = $(EXTRA)
+
+CLEANFILES = 
diff --git a/doc/examples/README b/doc/examples/README
new file mode 100644
index 000000000..4d472ac08
--- /dev/null
+++ b/doc/examples/README
@@ -0,0 +1,13 @@
+GlusterFS's translator feature is very flexible and there are quite a lot of ways one 
+can configure their filesystem to behave like. 
+
+Volume Specification is a way in which GlusterFS understands how it has to work, based 
+on what is written there. 
+
+Going through the following URLs may give you more idea about all these.
+
+* http://www.gluster.org/docs/index.php/GlusterFS
+* http://www.gluster.org/docs/index.php/GlusterFS_Volume_Specification
+* http://www.gluster.org/docs/index.php/GlusterFS_Translators
+
+Mail us any doubts, suggestions on 'gluster-devel(at)nongnu.org'
diff --git a/doc/examples/filter.vol b/doc/examples/filter.vol
new file mode 100644
index 000000000..ca5c59837
--- /dev/null
+++ b/doc/examples/filter.vol
@@ -0,0 +1,23 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+  option remote-subvolume brick        # name of the remote volume
+end-volume
+
+## In normal clustered storage type, any of the cluster translators can come here.
+#
+# Definition of other clients
+# 
+# Definition of cluster translator (may be unify, afr, or unify over afr)
+# 
+
+### 'Filter' translator is used on client side (or server side according to needs). This traslator makes all the below translators, (or say volumes) as read-only. Hence if one wants a 'read-only' filesystem, using filter as the top most volume will make it really fast as the fops are returned from this level itself.
+
+volume filter-ro
+ type features/filter
+ option root-squashing enable
+# option completely-read-only yes
+# translate-uid 1-99=0
+ subvolumes client
+end-volume
\ No newline at end of file
diff --git a/doc/examples/io-cache.vol b/doc/examples/io-cache.vol
new file mode 100644
index 000000000..5f3eca4c5
--- /dev/null
+++ b/doc/examples/io-cache.vol
@@ -0,0 +1,25 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+  option remote-subvolume brick        # name of the remote volume
+end-volume
+
+## In normal clustered storage type, any of the cluster translators can come here.
+#
+# Definition of other clients
+# 
+# Definition of cluster translator (may be unify, replicate, or unify over replicate)
+# 
+
+### 'IO-Cache' translator is best used on client side when a filesystem has file which are not modified frequently but read several times. For example, while compiling a kernel, *.h files are read while compiling every *.c file, in these case, io-cache translator comes very handy, as it keeps the whole file content in the cache, and serves from the cache.
+# One can provide the priority of the cache too.
+
+volume ioc
+  type performance/io-cache
+  subvolumes client         # In this example it is 'client' you may have to change it according to your spec file.
+  option page-size 1MB      # 128KB is default
+  option cache-size 64MB    # 32MB is default
+  option force-revalidate-timeout 5 # 1second is default 
+  option priority *.html:2,*:1 # default is *:0
+end-volume
diff --git a/doc/examples/io-threads.vol b/doc/examples/io-threads.vol
new file mode 100644
index 000000000..9954724e1
--- /dev/null
+++ b/doc/examples/io-threads.vol
@@ -0,0 +1,21 @@
+
+volume brick
+  type storage/posix                   # POSIX FS translator
+  option directory /home/export        # Export this directory
+end-volume
+
+###  'IO-threads' translator gives a threading behaviour to File I/O calls. All other normal fops are having default behaviour. Loading this on server side helps to reduce the contension of network. (Which is assumed as a GlusterFS hang). 
+# One can load it in client side to reduce the latency involved in case of a slow network, when loaded below write-behind.
+volume iot
+  type performance/io-threads
+  subvolumes brick
+  option thread-count 4 # default value is 1
+end-volume
+
+volume server
+  type protocol/server
+  subvolumes iot brick
+  option transport-type tcp     # For TCP/IP transport
+  option auth.addr.brick.allow 192.168.* # Allow access to "brick" volume
+  option auth.addr.iot.allow 192.168.* # Allow access to "p-locks" volume
+end-volume
diff --git a/doc/examples/posix-locks.vol b/doc/examples/posix-locks.vol
new file mode 100644
index 000000000..b9c9e7a64
--- /dev/null
+++ b/doc/examples/posix-locks.vol
@@ -0,0 +1,20 @@
+
+volume brick
+  type storage/posix                   # POSIX FS translator
+  option directory /home/export        # Export this directory
+end-volume
+
+### 'Posix-locks' feature should be added on the server side (as posix volume as subvolume) because it contains the actual file. 
+volume p-locks
+  type features/posix-locks
+  subvolumes brick
+  option mandatory on
+end-volume
+
+volume server
+  type protocol/server
+  subvolumes p-locks brick
+  option transport-type tcp
+  option auth.addr.brick.allow 192.168.* # Allow access to "brick" volume
+  option auth.addr.p-locks.allow 192.168.* # Allow access to "p-locks" volume
+end-volume
diff --git a/doc/examples/protocol-client.vol b/doc/examples/protocol-client.vol
new file mode 100644
index 000000000..43108f2c2
--- /dev/null
+++ b/doc/examples/protocol-client.vol
@@ -0,0 +1,17 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+# option transport-type ib-sdp  # for Infiniband transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+# option transport.socket.remote-port 6996              # default server port is 6996
+
+# option transport-type ib-verbs # for Infiniband verbs transport
+# option transport.ib-verbs.work-request-send-size  1048576
+# option transport.ib-verbs.work-request-send-count 16
+# option transport.ib-verbs.work-request-recv-size  1048576
+# option transport.ib-verbs.work-request-recv-count 16
+# option transport.ib-verbs.remote-port 6996              # default server port is 6996
+
+  option remote-subvolume brick        # name of the remote volume
+# option transport-timeout 30          # default value is 120seconds 
+end-volume
diff --git a/doc/examples/protocol-server.vol b/doc/examples/protocol-server.vol
new file mode 100644
index 000000000..88477511f
--- /dev/null
+++ b/doc/examples/protocol-server.vol
@@ -0,0 +1,25 @@
+
+### Export volume "brick" with the contents of "/home/export" directory.
+volume brick
+  type storage/posix                   # POSIX FS translator
+  option directory /home/export        # Export this directory
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp      # For TCP/IP transport
+# option transport.socket.listen-port 6996              # Default is 6996
+
+# option transport-type ib-verbs # For Infiniband Verbs transport
+# option transport.ib-verbs.work-request-send-size  131072
+# option transport.ib-verbs.work-request-send-count 64
+# option transport.ib-verbs.work-request-recv-size  131072
+# option transport.ib-verbs.work-request-recv-count 64
+# option transport.ib-verbs.listen-port 6996              # Default is 6996
+
+# option bind-address 192.168.1.10     # Default is to listen on all interfaces
+# option client-volume-filename /etc/glusterfs/glusterfs-client.vol
+  subvolumes brick 
+  option auth.addr.brick.allow 192.168.* # Allow access to "brick" volume
+end-volume
diff --git a/doc/examples/read-ahead.vol b/doc/examples/read-ahead.vol
new file mode 100644
index 000000000..3ce0d95ac
--- /dev/null
+++ b/doc/examples/read-ahead.vol
@@ -0,0 +1,22 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+  option remote-subvolume brick        # name of the remote volume
+end-volume
+
+## In normal clustered storage type, any of the cluster translators can come here.
+#
+# Definition of other clients
+# 
+# Definition of cluster translator (may be unify, replicate, or unify over replicate)
+# 
+
+### 'Read-Ahead' translator is best utilized on client side, as it prefetches the file contents when the first read() call is issued. 
+volume ra
+  type performance/read-ahead
+  subvolumes client            # In this example it is 'client' you may have to change it according to your spec file.
+  option page-size 1MB         # default is 256KB
+  option page-count 4          # default is 2
+  option force-atime-update no # defalut is 'no'
+end-volume
diff --git a/doc/examples/replicate.vol b/doc/examples/replicate.vol
new file mode 100644
index 000000000..8c9541444
--- /dev/null
+++ b/doc/examples/replicate.vol
@@ -0,0 +1,119 @@
+### 'NOTE'
+# This file has both server spec and client spec to get an understanding of stripe's spec file. Hence can't be used as it is, as a GlusterFS spec file. 
+# One need to seperate out server spec and client spec to get it working.
+
+#=========================================================================
+
+# **** server1 spec file ****
+
+### Export volume "brick" with the contents of "/home/export" directory.
+volume posix1
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export1        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick1
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix1
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp                      # For TCP/IP transport
+  option transport.socket.listen-port 6996       # Default is 6996
+# option client-volume-filename /etc/glusterfs/glusterfs-client.vol
+  subvolumes brick1
+  option auth.addr.brick1.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server2 spec file ****
+volume posix2
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export2        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick2
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix2
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp                  # For TCP/IP transport
+  option transport.socket.listen-port 6997   # Default is 6996
+  subvolumes brick2
+  option auth.addr.brick2.allow * # Allow access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server3 spec file ****
+
+volume posix3
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export3        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick3
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix3
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp                 # For TCP/IP transport
+  option transport.socket.listen-port 6998  # Default is 6996
+  subvolumes brick3
+  option auth.addr.brick3.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** Clustered Client config file ****
+
+### Add client feature and attach to remote subvolume of server1
+volume client1
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6996              # default server port is 6996
+  option remote-subvolume brick1        # name of the remote volume
+end-volume
+
+### Add client feature and attach to remote subvolume of server2
+volume client2
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6997              # default server port is 6996
+  option remote-subvolume brick2        # name of the remote volume
+end-volume
+
+volume client3
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6998              # default server port is 6996
+  option remote-subvolume brick3        # name of the remote volume
+end-volume
+
+## Add replicate feature.
+volume replicate
+  type cluster/replicate
+  subvolumes client1 client2 client3
+end-volume
+
diff --git a/doc/examples/stripe.vol b/doc/examples/stripe.vol
new file mode 100644
index 000000000..ea24cf860
--- /dev/null
+++ b/doc/examples/stripe.vol
@@ -0,0 +1,121 @@
+
+### 'NOTE'
+# This file has both server spec and client spec to get an understanding of stripe's spec file. Hence can't be used as it is, as a GlusterFS spec file. 
+# One need to seperate out server spec and client spec to get it working.
+
+#=========================================================================
+
+# **** server1 spec file ****
+
+### Export volume "brick" with the contents of "/home/export" directory.
+volume posix1
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export1        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick1
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix1
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6996              # Default is 6996
+# option client-volume-filename /etc/glusterfs/glusterfs-client.vol
+  subvolumes brick1
+  option auth.addr.brick1.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server2 spec file ****
+volume posix2
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export2        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick2
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix2
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6997              # Default is 6996
+  subvolumes brick2
+  option auth.addr.brick2.allow * # Allow access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server3 spec file ****
+
+volume posix3
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export3        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick3
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix3
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6998              # Default is 6996
+  subvolumes brick3
+  option auth.addr.brick3.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** Clustered Client config file ****
+
+### Add client feature and attach to remote subvolume of server1
+volume client1
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6996              # default server port is 6996
+  option remote-subvolume brick1        # name of the remote volume
+end-volume
+
+### Add client feature and attach to remote subvolume of server2
+volume client2
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6997              # default server port is 6996
+  option remote-subvolume brick2        # name of the remote volume
+end-volume
+
+volume client3
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6998              # default server port is 6996
+  option remote-subvolume brick3        # name of the remote volume
+end-volume
+
+## Add Stripe Feature.
+volume stripe
+  type cluster/stripe
+  subvolumes client1 client2 client3
+  option block-size 1MB
+end-volume
+
diff --git a/doc/examples/trace.vol b/doc/examples/trace.vol
new file mode 100644
index 000000000..3f4864db4
--- /dev/null
+++ b/doc/examples/trace.vol
@@ -0,0 +1,16 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+  option remote-subvolume brick        # name of the remote volume
+end-volume
+
+### 'Trace' translator is a very handy debug tool for GlusterFS, as it can be loaded between any of the two volumes without changing the behaviour of the filesystem. 
+# On client side it can be the top most volume in spec (like now) to understand what calls are made on FUSE filesystem, when a mounted filesystem is accessed.
+
+volume trace
+  type debug/trace
+  subvolumes client
+end-volume
+
+# 'NOTE:' By loading 'debug/trace' translator, filesystem will be very slow as it logs each and every calls to the log file.
diff --git a/doc/examples/trash.vol b/doc/examples/trash.vol
new file mode 100644
index 000000000..16e71be32
--- /dev/null
+++ b/doc/examples/trash.vol
@@ -0,0 +1,20 @@
+
+volume brick
+  type storage/posix                   # POSIX FS translator
+  option directory /home/export        # Export this directory
+end-volume
+
+### 'Trash' translator is best used on server side as it just renames the deleted file inside 'trash-dir', and it makes 4 seperate fops for one unlink call.  
+volume trashcan
+  type features/trash
+  subvolumes brick
+  option trash-dir /.trashcan
+end-volume
+
+volume server
+  type protocol/server
+  subvolumes trashcan brick
+  option transport-type tcp     # For TCP/IP transport
+  option auth.addr.brick.allow 192.168.* # Allow access to "brick" volume
+  option auth.addr.trashcan.allow 192.168.* # Allow access to "p-locks" volume
+end-volume
diff --git a/doc/examples/unify.vol b/doc/examples/unify.vol
new file mode 100644
index 000000000..4f7415a23
--- /dev/null
+++ b/doc/examples/unify.vol
@@ -0,0 +1,178 @@
+### 'NOTE'
+# This file has both server spec and client spec to get an understanding of stripe's spec file. Hence can't be used as it is, as a GlusterFS spec file. 
+# One need to seperate out server spec and client spec to get it working.
+
+
+#=========================================================================
+
+# **** server1 spec file ****
+
+### Export volume "brick" with the contents of "/home/export" directory.
+volume posix1
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export1        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick1
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix1
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6996              # Default is 6996
+# option client-volume-filename /etc/glusterfs/glusterfs-client.vol
+  subvolumes brick1
+  option auth.addr.brick1.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server2 spec file ****
+volume posix2
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export2        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick2
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix2
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6997              # Default is 6996
+  subvolumes brick2
+  option auth.addr.brick2.allow * # Allow access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** server3 spec file ****
+
+volume posix3
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export3        # Export this directory
+end-volume
+
+### Add POSIX record locking support to the storage brick
+volume brick3
+  type features/posix-locks
+  option mandatory on          # enables mandatory locking on all files
+  subvolumes posix3
+end-volume
+
+### Add network serving capability to above brick.
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6998              # Default is 6996
+  subvolumes brick3
+  option auth.addr.brick3.allow * 		# access to "brick" volume
+end-volume
+
+#=========================================================================
+
+# *** server for namespace *** 
+### Export volume "brick" with the contents of "/home/export" directory.
+volume brick-ns
+  type storage/posix                    # POSIX FS translator
+  option directory /home/export-ns      # Export this directory
+end-volume
+
+volume server
+  type protocol/server
+  option transport-type tcp     # For TCP/IP transport
+  option transport.socket.listen-port 6999              # Default is 6996
+  subvolumes brick-ns
+  option auth.addr.brick-ns.allow * 		# access to "brick" volume
+end-volume
+
+
+#=========================================================================
+
+# **** Clustered Client config file ****
+
+### Add client feature and attach to remote subvolume of server1
+volume client1
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+# option transport-type ib-sdp  # for Infiniband transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6996              # default server port is 6996
+  option remote-subvolume brick1        # name of the remote volume
+end-volume
+
+### Add client feature and attach to remote subvolume of server2
+volume client2
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+# option transport-type ib-sdp  # for Infiniband transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6997              # default server port is 6996
+  option remote-subvolume brick2        # name of the remote volume
+end-volume
+
+volume client3
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+# option transport-type ib-sdp  # for Infiniband transport
+  option remote-host 127.0.0.1      # IP address of the remote brick
+  option transport.socket.remote-port 6998              # default server port is 6996
+  option remote-subvolume brick3        # name of the remote volume
+end-volume
+
+
+volume client-ns
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+# option transport-type ib-sdp  # for Infiniband transport
+  option remote-host 127.0.0.1         # IP address of the remote brick
+  option transport.socket.remote-port 6999              # default server port is 6996
+  option remote-subvolume brick-ns     # name of the remote volume
+end-volume
+
+### Add unify feature to cluster the servers. Associate an
+### appropriate scheduler that matches your I/O demand.
+volume bricks
+  type cluster/unify
+  option namespace client-ns # this will not be storage child of unify.
+  subvolumes client1 client2 client3
+### ** ALU Scheduler Option **
+  option self-heal background # foreground off # default is foreground
+  option scheduler alu
+  option alu.limits.min-free-disk  5% #%
+  option alu.limits.max-open-files 10000
+  option alu.order disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage
+  option alu.disk-usage.entry-threshold 2GB
+  option alu.disk-usage.exit-threshold  128MB
+  option alu.open-files-usage.entry-threshold 1024
+  option alu.open-files-usage.exit-threshold 32
+  option alu.read-usage.entry-threshold 20 #%
+  option alu.read-usage.exit-threshold 4 #%
+  option alu.write-usage.entry-threshold 20 #%
+  option alu.write-usage.exit-threshold 4 #%
+  option alu.disk-speed-usage.entry-threshold 0 # DO NOT SET IT. SPEED IS CONSTANT!!!.
+  option alu.disk-speed-usage.exit-threshold 0 # DO NOT SET IT. SPEED IS CONSTANT!!!.
+  option alu.stat-refresh.interval 10sec
+  option alu.stat-refresh.num-file-create 10
+### ** Random Scheduler **
+# option scheduler random
+### ** NUFA Scheduler **
+# option scheduler nufa
+# option nufa.local-volume-name posix1
+### ** Round Robin (RR) Scheduler **
+# option scheduler rr
+# option rr.limits.min-free-disk 5% #%
+end-volume
+
diff --git a/doc/examples/write-behind.vol b/doc/examples/write-behind.vol
new file mode 100644
index 000000000..9c6bae11c
--- /dev/null
+++ b/doc/examples/write-behind.vol
@@ -0,0 +1,26 @@
+volume client
+  type protocol/client
+  option transport-type tcp     # for TCP/IP transport
+  option remote-host 192.168.1.10      # IP address of the remote brick
+  option remote-subvolume brick        # name of the remote volume
+end-volume
+
+## In normal clustered storage type, any of the cluster translators can come here.
+#
+# Definition of other clients
+# 
+# Definition of cluster translator (may be unify, replicate, or unify over replicate)
+# 
+
+
+### 'Write-behind' translator is a performance booster for write operation. Best used on client side, as its main intension is to reduce the network latency caused for each write operation.
+
+volume wb
+  type performance/write-behind
+  subvolumes client         # In this example it is 'client' you may have to change it according to your spec file.
+  option flush-behind on    # default value is 'off'
+  option window-size 2MB
+  option aggregate-size 1MB # default value is 0
+  option enable_O_SYNC no  # default is no
+  option disable-for-first-nbytes 128KB #default is 1 
+end-volume