Re: after hard reboot, split-brain happened, but nothing showed in gluster voluem heal info command !

Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> · Thu, 28 Sep 2017 11:32:17 +0530

Hi,

To resolve the gfid split-brain you can follow the steps at [1].
Since we don't have the pending markers set on the files, it is not showing in the heal info.
To debug this issue, need some more data from you. Could you provide these things?
1. volume info
2. mount log
3. brick logs
4. shd log

May I also know which version of gluster you are running. From the info you have provided it looks like an old version.
If it is, then it would be great if you can upgarde to one of the latest supported release.

[1] http://docs.gluster.org/en/latest/Troubleshooting/split-brain/#fixing-directory-entry-split-brain

Thanks & Regards,
Karthik

On Wed, Sep 27, 2017 at 9:42 AM, Zhou, Cynthia (NSB - CN/Hangzhou) <cynthia.zhou@xxxxxxxxxxxxxxx> wrote:

HI gluster experts,

I meet a tough problem about “split-brain” issue. Sometimes, after hard reboot, we will find some files in split-brain, however its parent directory or anything could be shown in command “gluster
volume heal <volume-name> info”, also, no entry in .glusterfs/indices/xattrop directory, can you help to shed some lights on this issue? Thanks!

Following is some info from our env,

Checking from sn-0 cliet, nothing is shown in-split-brain!

[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
# gluster v heal services info
Brick sn-0:/mnt/bricks/services/brick/
Number of entries: 0

Brick sn-1:/mnt/bricks/services/brick/
Number of entries: 0

[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
# gluster v heal services info split-brain
Gathering list of split brain entries on volume services has been successful 

Brick sn-0.local:/mnt/bricks/services/brick
Number of entries: 0

Brick sn-1.local:/mnt/bricks/services/brick
Number of entries: 0

[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
# ls -l /mnt/services/netserv/ethip/
ls: cannot access '/mnt/services/netserv/ethip/sn-2': Input/output error
ls: cannot access '/mnt/services/netserv/ethip/mn-1': Input/output error
total 3
-rw-r--r-- 1 root root 144 Sep 26 20:35 as-0
-rw-r--r-- 1 root root 144 Sep 26 20:35 as-1
-rw-r--r-- 1 root root 145 Sep 26 20:35 as-2
-rw-r--r-- 1 root root 237 Sep 26 20:36 mn-0
-????????? ? ?    ?      ?            ? mn-1
-rw-r--r-- 1 root root  73 Sep 26 20:35 sn-0
-rw-r--r-- 1 root root  73 Sep 26 20:35 sn-1
-????????? ? ?    ?      ?            ? sn-2
[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]

Checking from glusterfs server side, the gfid of mn-1 on sn-0 and sn-1 is different

[SN-0]
[root@sn-0:/mnt/bricks/services/brick/.glusterfs/53/a3]
# getfattr -m . -d -e hex /mnt/bricks/services/brick/netserv/ethip
getfattr: Removing leading '/' from absolute path names
# file: mnt/bricks/services/brick/netserv/ethip
trusted.gfid=0xee71d19ac0f84f60b11eb42a083644e4
trusted.glusterfs.dht=0x000000010000000000000000ffffffff

[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
# getfattr -m . -d -e hex mn-1
# file: mn-1
trusted.afr.dirty=0x000000000000000000000000
trusted.afr.services-client-0=0x000000000000000000000000
trusted.afr.services-client-1=0x000000000000000000000000
trusted.gfid=0x53a33f437464475486f31c4e44d83afd
[root@sn-0:/mnt/bricks/services/brick/netserv/ethip]
# stat mn-1
  File: mn-1
  Size: 237              Blocks: 16         IO Block: 4096   regular file
Device: fd51h/64849d    Inode: 2536        Links: 2
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2017-09-26 20:30:25.679000000 +0300
Modify: 2017-09-26 20:30:24.604000000 +0300
Change: 2017-09-26 20:30:24.610000000 +0300
 Birth: -
[root@sn-0:/mnt/bricks/services/brick/.glusterfs/indices/xattrop]
# ls
xattrop-63f8bbcb-7fa6-4fc8-b721-675a05de0ab3
[root@sn-0:/mnt/bricks/services/brick/.glusterfs/indices/xattrop]

[root@sn-0:/mnt/bricks/services/brick/.glusterfs/53/a3]
# ls
53a33f43-7464-4754-86f3-1c4e44d83afd
[root@sn-0:/mnt/bricks/services/brick/.glusterfs/53/a3]
# stat 53a33f43-7464-4754-86f3-1c4e44d83afd 
  File: 53a33f43-7464-4754-86f3-1c4e44d83afd
  Size: 237              Blocks: 16         IO Block: 4096   regular file
Device: fd51h/64849d    Inode: 2536        Links: 2
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2017-09-26 20:30:25.679000000 +0300
Modify: 2017-09-26 20:30:24.604000000 +0300
Change: 2017-09-26 20:30:24.610000000 +0300
 Birth: -

#
[SN-1]

[root@sn-1:/mnt/bricks/services/brick/.glusterfs/f7/f1]
#  getfattr -m . -d -e hex /mnt/bricks/services/brick/netserv/ethip
getfattr: Removing leading '/' from absolute path names
# file: mnt/bricks/services/brick/netserv/ethip
trusted.gfid=0xee71d19ac0f84f60b11eb42a083644e4
trusted.glusterfs.dht=0x000000010000000000000000ffffffff

[root@sn-1:/mnt/bricks/services/brick/.glusterfs/f7/f1]
#
[root@sn-1:/mnt/bricks/services/brick/netserv/ethip]
# getfattr -m . -d -e hex mn-1
# file: mn-1
trusted.afr.dirty=0x000000000000000000000000
trusted.afr.services-client-0=0x000000000000000000000000
trusted.afr.services-client-1=0x000000000000000000000000
trusted.gfid=0xf7f10f980acc4041a015e48018571d4a

[root@sn-1:/mnt/bricks/services/brick/netserv/ethip]
# stat mn-1
  File: mn-1
  Size: 237              Blocks: 16         IO Block: 4096   regular file
Device: fd41h/64833d    Inode: 2608        Links: 2
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2017-09-26 20:31:48.231000000 +0300
Modify: 2017-09-26 20:31:46.872000000 +0300
Change: 2017-09-26 20:31:46.875000000 +0300
 Birth: -
[root@sn-1:/mnt/bricks/services/brick/.glusterfs/indices/xattrop]
# ls
xattrop-240713ea-eda3-4914-a55d-7dd4aed724ed
[root@sn-1:/mnt/bricks/services/brick/.glusterfs/indices/xattrop]

[root@sn-1:/mnt/bricks/services/brick/.glusterfs/f7/f1]
# stat f7f10f98-0acc-4041-a015-e48018571d4a 
  File: f7f10f98-0acc-4041-a015-e48018571d4a
  Size: 237              Blocks: 16         IO Block: 4096   regular file
Device: fd41h/64833d    Inode: 2608        Links: 2
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2017-09-26 20:31:48.231000000 +0300
Modify: 2017-09-26 20:31:46.872000000 +0300
Change: 2017-09-26 20:31:46.875000000 +0300
 Birth: -

Best regards,

Cynthia （周琳）
MBB SM HETRAN SW3 MATRIX  
Storage         

Mobile: +86 (0)18657188311

Best regards,

Cynthia （周琳）
MBB SM HETRAN SW3 MATRIX  
Storage         

Mobile: +86 (0)18657188311

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