[Gluster-users] bitrot error correction in gluster 3.8 distributed dispersed setup

[itlinux_team]

Hi,

the procedure worked (had to execute a heal manually to heal both files 
as I don't have self heal enabled). Both files where also in 
.glusterfs/quarantine , I assume it is safe to delete them too or it 
will affect the next scrub?
Thanks for the info!

Regards,
Iñaki.
On 07/21/2016 07:45 AM, Kotresh Hiremath Ravishankar wrote:
> Hi,
>
> Please follow below steps to restore:
>
>
>    1. Determine the path of each corrupted object from gfid shown from bitrot status command
>
> 	# find /bricks/*/.glusterfs -name GFID
> 	/bricks/brick1/.glusterfs/path/to/GFID
>
> 	# find /bricks -samefile /bricks/brick1/.glusterfs/path/to/GFID
> 	/bricks/brick1/.glusterfs/path/to/GFID
> 	/bricks/brick1/path/to/corrupted_file
>
>    2. Delete the corrupted files including .glusterfs GFID link file
> 	Delete the corrupted files from the path output by the find command.
>
>    3. Heal the file
> 	If you have client self-heal enabled, the file is healed the next time that you access it.
> 	If you do not have client self-heal enabled, you must manually heal the volume with the following command.
>
> 	# gluster volume heal VOLNAME
>
> 	The next time that the bitrot scrubber runs, this GFID is no longer listed (unless it has become corrupted again).
>
> Thanks and Regards,
> Kotresh H R
>
> ----- Original Message -----
>> From: "Ashish Pandey" <aspandey at redhat.com>
>> To: "itlinux_team" <itlinux at imppc.org>
>> Cc: gluster-users at gluster.org, "Kotresh Hiremath Ravishankar" <khiremat at redhat.com>
>> Sent: Thursday, July 21, 2016 10:57:51 AM
>> Subject: Re: [Gluster-users] bitrot error correction in gluster 3.8 distributed	dispersed setup
>>
>>
>> Hi,
>>
>> "gluster v heal " command does not heal corrupt files detected by bitrot
>> feature.
>> You have modified a file from back end and corrupted it.
>>
>> I think to correct your corrupted files (in fact the part of file in case of
>> disperse volume) you have to delete that part and run gluster v heal
>> <volname> full
>> to correct the file.
>>
>> Keeping Kotresh in cc for better input of bitrot.
>>
>> Ashish
>>
>>
>> ----- Original Message -----
>>
>> From: "itlinux_team" <itlinux at imppc.org>
>> To: gluster-users at gluster.org
>> Sent: Wednesday, July 20, 2016 7:43:56 PM
>> Subject: [Gluster-users] bitrot error correction in gluster 3.8 distributed
>> dispersed setup
>>
>> Hi all,
>>
>> I'm testing the bitrot feature on a distributed dispersed setup: 3 x (8
>> + 4).
>> I simulated a bit-flip on the part of a couple of files in a brick,
>> having bitrot feature enabled before. The output from ''gluster volume
>> bitrot vol_1 scrub status'' shows that two files are corrupted as shown
>> below:
>>
>>
>> ---
>> Volume name : vol_1
>>
>> State of scrub: Active
>>
>> Scrub impact: normal
>>
>> Scrub frequency: daily
>>
>> Bitrot error log location: /var/log/glusterfs/bitd.log
>>
>> Scrubber error log location: /var/log/glusterfs/scrub.log
>>
>>
>> =========================================================
>>
>> Node: localhost
>>
>> Number of Scrubbed files: 564
>>
>> Number of Skipped files: 0
>>
>> Last completed scrub time: 2016-07-20 13:37:16
>>
>> Duration of last scrub (D:M:H:M:S): 0:0:0:50
>>
>> Error count: 0
>>
>>
>> =========================================================
>>
>> Node: glusterserver1
>>
>> Number of Scrubbed files: 562
>>
>> Number of Skipped files: 0
>>
>> Last completed scrub time: 2016-07-20 13:37:16
>>
>> Duration of last scrub (D:M:H:M:S): 0:0:0:51
>>
>> Error count: 2
>>
>> Corrupted object's [GFID]:
>>
>> e3cbffbe-12bd-4e1c-8dcf-2ef87ac99990
>>
>> 2550475e-cf9e-4781-9a05-9e11c1dd6b7a
>>
>>
>> =========================================================
>>
>> Node: glusterserver3
>>
>> Number of Scrubbed files: 564
>>
>> Number of Skipped files: 0
>>
>> Last completed scrub time: 2016-07-20 13:37:16
>>
>> Duration of last scrub (D:M:H:M:S): 0:0:0:50
>> ---
>>
>>
>> I have executed ''gluster volume heal vol_1 full'' but it does not seem
>> to fix the files, however the file that the client reads is the correct
>> one.
>>
>> How should I handle this kind of corruption within gluster?
>>
>> Thanks!
>> Iñaki.
>>
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>>
>>