Re: volume process does not start - glusterfs is happy with it?

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Greetings,

I'm not sure if that's directly related to your problem, but on a general level, AFAIK, replica-2 vols are not recommended due to split brain possibility:
https://docs.gluster.org/en/latest/Administrator%20Guide/Split%20brain%20and%20ways%20to%20deal%20with%20it/

It's recommended to either use replica-3 or arbiter Arbiter.

Regards,

On Tue, Jun 30, 2020 at 1:14 PM lejeczek <peljasz@xxxxxxxxxxx> wrote:
Hi everybody.

I have two peers in the cluster and a 2-replica volume which seems okey if it was not for one weird bit - when a peer reboots then on that peer after a reboot I see:

$ gluster volume status USERs
Status of volume: USERs
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick swir.direct:/00.STORAGE/2/0-GLUSTER-U
SERs                                        N/A       N/A        N       N/A 
Brick dzien.direct:/00.STORAGE/2/0-GLUSTER-
USERs                                       49152     0          Y       57338
Self-heal Daemon on localhost               N/A       N/A        Y       4302
Self-heal Daemon on dzien.direct            N/A       N/A        Y       57359
 
Task Status of Volume USERs
------------------------------------------------------------------------------
There are no active volume tasks

I do not suppose it's expected.
On such rebooted node I see:
$ systemctl status -l glusterd
● glusterd.service - GlusterFS, a clustered file-system server
   Loaded: loaded (/usr/lib/systemd/system/glusterd.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/glusterd.service.d
           └─override.conf
   Active: active (running) since Mon 2020-06-29 21:37:36 BST; 13h ago
     Docs: man:glusterd(8)
  Process: 4071 ExecStart=/usr/sbin/glusterd -p /var/run/glusterd.pid --log-level $LOG_LEVEL $GLUSTERD_OPTIONS (code=exited, status>
 Main PID: 4086 (glusterd)
    Tasks: 20 (limit: 101792)
   Memory: 28.9M
   CGroup: /system.slice/glusterd.service
           ├─4086 /usr/sbin/glusterd -p /var/run/glusterd.pid --log-level INFO
           └─4302 /usr/sbin/glusterfs -s localhost --volfile-id shd/USERs -p /var/run/gluster/shd/USERs/USERs-shd.pid -l /var/log/g>

Jun 29 21:37:36 swir.private.pawel systemd[1]: Starting GlusterFS, a clustered file-system server...
Jun 29 21:37:36 swir.private.pawel systemd[1]: Started GlusterFS, a clustered file-system server.

And I do not see any other apparent problems nor errors.
On that node I manually:
$ systemctl restart glusterd.service
and...

$ gluster volume status USERs
Status of volume: USERs
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick swir.direct:/00.STORAGE/2/0-GLUSTER-U
SERs                                        49152     0          Y       103225
Brick dzien.direct:/00.STORAGE/2/0-GLUSTER-
USERs                                       49152     0          Y       57338
Self-heal Daemon on localhost               N/A       N/A        Y       103270
Self-heal Daemon on dzien.direct            N/A       N/A        Y       57359

Is not a puzzle??? I'm on glusterfs-7.6-1.el8.x86_64
I hope somebody can share some thoughts.
many thanks, L.

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