[Gluster-users] self-heal failed

[Liang Ma]

Hi There,

I'd like to test and understand the self heal feature of glusterfs. This is
what I did with 3.3.1-ubuntu1~precise4 on Ubuntu 12.04.1 LTS.

gluster volume create gtest replica 2 gluster3:/zfs-test gluster4:/zfs-test

where zfs-test is a zfs pool on partition /dev/sda6 in both nodes.

To simulate a random corruption on node gluster3

dd if=/dev/urandom of=/dev/sda6 bs=1024 count=20480

Now zfs detected the corrupted files

  pool: zfs-test state: ONLINEstatus: One or more devices has
experienced an error resulting in data        corruption.
Applications may be affected.action: Restore the file in question if
possible.  Otherwise restore the        entire pool from backup.
see: http://zfsonlinux.org/msg/ZFS-8000-8A scan: none requestedconfig:
       NAME        STATE     READ WRITE CKSUM        zfs-test   ONLINE
      0     0 2.29K          sda6     ONLINE       0     0
4.59Kerrors: Permanent errors have been detected in the following
files:        /zfs-test/<xattrdir>/trusted.gfid
/zfs-test/.glusterfs/b0/1e/b01ec17c-14cc-4999-938b-b4a71e358b46
/zfs-test/.glusterfs/b0/1e/b01ec17c-14cc-4999-938b-b4a71e358b46/<xattrdir>/trusted.gfid
       /zfs-test/.glusterfs/dd/8c/dd8c6797-18c3-4f3b-b1ca-86def2b578c5/<xattrdir>/trusted.gfid


Now the gluster log file shows the self heal can't fix the corruption
[2013-01-08 12:46:03.371214] W
[afr-common.c:1196:afr_detect_self_heal_by_iatt] 2-gtest-replicate-0:
/K.iso: gfid different on subvolume
[2013-01-08 12:46:03.373539] E
[afr-self-heal-common.c:1419:afr_sh_common_lookup_cbk] 2-gtest-replicate-0:
Missing Gfids for /K.iso
[2013-01-08 12:46:03.385701] E
[afr-self-heal-common.c:2160:afr_self_heal_completion_cbk]
2-gtest-replicate-0: background  gfid self-heal failed on /K.iso
[2013-01-08 12:46:03.385760] W [fuse-bridge.c:292:fuse_entry_cbk]
0-glusterfs-fuse: 11901: LOOKUP() /K.iso => -1 (No data available)

where K.iso is one of the sample files affected by the dd command.

So could anyone tell me what is the best way to repair the simulated
corruption?

Thank you.

Liang
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