[Gluster-users] [gluster] possible split-brain issue

[Jifeng Li]

Hi ,

[issue]:  To ensure the glusterFS mount point work, a script will periodically using HTTP put a file to subdirectory under mount point which is used as  Apache DocumentRoot. But after running some time,  some errors show below:
[2015-01-14 09:18:40.915639] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /mpdis
[2015-01-14 09:18:41.924584] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 20 ] [ 21 0 ] ]
[2015-01-14 09:18:41.925182] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /
[2015-01-14 09:18:41.934827] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/mpdis' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 4 ] [ 2 0 ] ]
[2015-01-14 09:18:41.935375] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /mpdis
[2015-01-14 09:18:42.943742] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 20 ] [ 21 0 ] ]
[2015-01-14 09:18:42.944432] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /
[2015-01-14 09:18:42.946664] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/mpdis' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 4 ] [ 2 0 ] ]
[2015-01-14 09:18:42.947323] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /mpdis
[2015-01-14 09:18:43.955929] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 20 ] [ 21 0 ] ]
[2015-01-14 09:18:43.956701] E [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 0-gv0-replicate-0:  metadata self heal  failed,   on /
[2015-01-14 09:18:43.958874] E [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 0-gv0-replicate-0: Unable to self-heal contents of '/mpdis' (possible split-brain). Please delete the file from all but the preferred subvolume.- Pending matrix:  [ [ 0 4 ] [ 2 0 ] ]

Besides, I find  Input/output error shown below  when listing the files of under mount point:


[root at dmf-wpst-2 mpdis]# ll

total 0

-rwxr-xr-x. 1 apache apache 0 Jan 14 04:21 test.rep.00.00.00.00.dmf1

-rw-r--r--. 1 apache apache 0 Jan 14 04:21 test.rep.00.00.00.00.dmf2



[root at dmf-wpst-2 mpdis]# ll

total 0

-rwxr-xr-x. 1 apache apache 0 Jan 14 04:21 test.rep.00.00.00.00.dmf1

-rw-r--r--. 1 apache apache 0 Jan 14 04:21 test.rep.00.00.00.00.dmf2



[root at dmf-wpst-2 mpdis]# ll

ls: cannot open directory .: Input/output error



[root at dmf-wpst-2 mpdis]# ll

ls: cannot access test.rep.00.00.00.00.dmf1: Input/output error

ls: cannot access test.rep.00.00.00.00.dmf2: Input/output error

total 0

?????????? ? ? ? ?            ? test.rep.00.00.00.00.dmf1

?????????? ? ? ? ?            ? test.rep.00.00.00.00.dmf2
    Any tips about debugging further or getting this fixed up would be appreciated.

[version]: 3.5.3
[environment]:  two virtual server each has one brick :


root at dmf-wpst-2 mpdis]# gluster volume status

Status of volume: gv0

Gluster process                                                                                                Port       Online   Pid

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

Brick dmf-ha-1-glusterfs:/export/vdb1/brick                      49152    Y              332

Brick dmf-ha-2-glusterfs:/export/vdb1/brick                      49154    Y              19396

Self-heal Daemon on localhost                                                  N/A        Y              19410

Self-heal Daemon on 10.175.123.246                                       N/A        Y              999



[root at dmf-wpst-1 mpdis]# gluster volume info

Volume Name: gv0

Type: Replicate

Volume ID: 51de44c3-f01e-486d-a6b7-10c7b7a270d7

Status: Started

Number of Bricks: 1 x 2 = 2

Transport-type: tcp

Bricks:

Brick1: dmf-ha-1-glusterfs:/export/vdb1/brick

Brick2: dmf-ha-2-glusterfs:/export/vdb1/brick

Options Reconfigured:

nfs.disable: ON

network.ping-timeout: 2

storage.bd-aio: on

storage.linux-aio: on

cluster.eager-lock: on

performance.client-io-threads: on

performance.cache-refresh-timeout: 60

performance.io-thread-count: 64

performance.cache-size: 8GB

cluster.server-quorum-type: none


  [mount-point info]:

1.       mount command

glusterfs -p /var/run/glusterfs.pid --volfile-server=dmf-ha-1-glusterfs --volfile-server=dmf-ha-2-glusterfs --volfile-id=gv0 /dmfcontents





2.       mount point directory hierarchy
[root at dmf-wpst-2 /]# ls -ld /dmfcontents/
drwxr-xr-x. 5 root root 71 Jan 14 04:39 /dmfcontents/
               [root at dmf-wpst-2 /]# ls -ld /dmfcontents/mpdis/
              drwxr-xr-x. 2 apache apache 89 Jan 14 04:39 /dmfcontents/mpdis/



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