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author | Venky Shankar <vshankar@redhat.com> | 2015-05-06 16:26:03 +0530 |
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committer | Humble Devassy Chirammal <humble.devassy@gmail.com> | 2015-05-06 05:02:53 -0700 |
commit | 96871c7ddc39cdb502ebfb6d975fe8859fc3e0e9 (patch) | |
tree | f9c12c582ba53f9f8e0b588feea0ca8a0326b17d /doc/admin-guide/en-US | |
parent | cb11dd91a6cc296e4a3808364077f4eacb810e48 (diff) |
doc/admin-guide: BitRot command line usage
Change-Id: Ic3c9da566673f4d9b1d0974c5aa15121da087fba
BUG: 1170075
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/10607
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Tested-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Diffstat (limited to 'doc/admin-guide/en-US')
-rw-r--r-- | doc/admin-guide/en-US/markdown/admin_managing_volumes.md | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/doc/admin-guide/en-US/markdown/admin_managing_volumes.md b/doc/admin-guide/en-US/markdown/admin_managing_volumes.md index de77dac944b..f45567a1141 100644 --- a/doc/admin-guide/en-US/markdown/admin_managing_volumes.md +++ b/doc/admin-guide/en-US/markdown/admin_managing_volumes.md @@ -710,3 +710,61 @@ The NUFA scheduler also exists, for use with the Unify translator; see below. - subvolumes This option lists the subvolumes that are part of this 'cluster/nufa' volume. This translator requires more than one subvolume. + +<a name="bitrot-detection" /> +##BitRot Detection + +With BitRot detection in Gluster, it's possible to identify "insidious" type of disk +errors where data is silently corrupted with no indication from the disk to the storage +software layer than an error has occured. This also helps in catching "backend" tinkering +of bricks (where data is directly manipulated on the bricks without going through FUSE, +NFS or any other access protocol(s). + +BitRot detection is disbled by default and needs to be enabled to make use of other +sub-commands. + +1. To enable bitrot detection for a given volume <VOLNAME>: + + `# gluster volume bitrot <VOLNAME> enable` + + and similarly to disable bitrot use: + + `# gluster volume bitrot <VOLNAME> disable` + +NOTE: Enabling bitrot spanws the Signer & Scrubber daemon per node. Signer is responsible + for signing (calculating checksum for each file) an object and scrubber verifies the + calculated checksum against the objects data. + +2. Scrubber daemon has three (3) throttling modes that adjusts the rate at which objects + are verified. + + `# volume bitrot <VOLNAME> scrub-throttle lazy` + + `# volume bitrot <VOLNAME> scrub-throttle normal` + + `# volume bitrot <VOLNAME> scrub-throttle aggressive` + +3. By default scrubber scrubs the filesystem biweekly. It's possible to tune it to scrub + based on predefined frequency such as monthly, etc. This can be done as shown below: + + `# volume bitrot <VOLNAME> scrub-frequency daily` + + `# volume bitrot <VOLNAME> scrub-frequency weekly` + + `# volume bitrot <VOLNAME> scrub-frequency biweekly` + + `# volume bitrot <VOLNAME> scrub-frequency monthly` + +NOTE: Daily scrubbing would not be available with GA release. + +4. Scrubber daemon can be paused and later resumed when required. This can be done as + shown below: + + `# volume bitrot <VOLNAME> scrub pause` + +and to resume scrubbing + + `# volume bitrot <VOLNAME> scrub resume` + +NOTE: Signing cannot be paused (and resumed) and would always be active as long as + bitrot is enabled for that particular volume. |