[Gluster-users] [Gluster-devel] Gluster Brick Offline after reboot!!

[Atin Mukherjee]

On 04/05/2016 03:35 PM, ABHISHEK PALIWAL wrote:
> 
> 
> On Tue, Apr 5, 2016 at 2:22 PM, Atin Mukherjee <amukherj at redhat.com
> <mailto:amukherj at redhat.com>> wrote:
> 
> 
> 
>     On 04/05/2016 01:04 PM, ABHISHEK PALIWAL wrote:
>     > Hi Team,
>     >
>     > We are using Gluster 3.7.6 and facing one problem in which brick is not
>     > comming online after restart the board.
>     >
>     > To understand our setup, please look the following steps:
>     > 1. We have two boards A and B on which Gluster volume is running in
>     > replicated mode having one brick on each board.
>     > 2. Gluster mount point is present on the Board A which is sharable
>     > between number of processes.
>     > 3. Till now our volume is in sync and everthing is working fine.
>     > 4. Now we have test case in which we'll stop the glusterd, reboot the
>     > Board B and when this board comes up, starts the glusterd again on it.
>     > 5. We repeated Steps 4 multiple times to check the reliability of system.
>     > 6. After the Step 4, sometimes system comes in working state (i.e. in
>     > sync) but sometime we faces that brick of Board B is present in
>     >     “gluster volume status” command but not be online even waiting for
>     > more than a minute.
>     As I mentioned in another email thread until and unless the log shows
>     the evidence that there was a reboot nothing can be concluded. The last
>     log what you shared with us few days back didn't give any indication
>     that brick process wasn't running.
> 
> How can we identify that the brick process is running in brick logs?
> 
>     > 7. When the Step 4 is executing at the same time on Board A some
>     > processes are started accessing the files from the Gluster mount point.
>     >
>     > As a solution to make this brick online, we found some existing issues
>     > in gluster mailing list giving suggestion to use “gluster volume start
>     > <vol_name> force” to make the brick 'offline' to 'online'.
>     >
>     > If we use “gluster volume start <vol_name> force” command. It will kill
>     > the existing volume process and started the new process then what will
>     > happen if other processes are accessing the same volume at the time when
>     > volume process is killed by this command internally. Will it impact any
>     > failure on these processes?
>     This is not true, volume start force will start the brick processes only
>     if they are not running. Running brick processes will not be
>     interrupted.
> 
> we have tried and check the pid of process before force start and after
> force start.
> the pid has been changed after force start.
> 
> Please find the logs at the time of failure attached once again with
> log-level=debug.
> 
> if you can give me the exact line where you are able to find out that
> the brick process
> is running in brick log file please give me the line number of that file.

Here is the sequence at which glusterd and respective brick process is
restarted.

1. glusterd restart trigger - line number 1014 in glusterd.log file:

[2016-04-03 10:12:29.051735] I [MSGID: 100030] [glusterfsd.c:2318:main]
0-/usr/sbin/glusterd: Started running /usr/sbin/              glusterd
version 3.7.6 (args: /usr/sbin/glusterd -p /var/run/glusterd.pid
--log-level DEBUG)

2. brick start trigger - line number 190 in opt-lvmdir-c2-brick.log

[2016-04-03 10:14:25.268833] I [MSGID: 100030] [glusterfsd.c:2318:main]
0-/usr/sbin/glusterfsd: Started running /usr/sbin/            glusterfsd
version 3.7.6 (args: /usr/sbin/glusterfsd -s 10.32.1.144 --volfile-id
c_glusterfs.10.32.1.144.opt-lvmdir-c2-brick -p /
system/glusterd/vols/c_glusterfs/run/10.32.1.144-opt-lvmdir-c2-brick.pid
-S /var/run/gluster/697c0e4a16ebc734cd06fd9150723005.        socket
--brick-name /opt/lvmdir/c2/brick -l
/var/log/glusterfs/bricks/opt-lvmdir-c2-brick.log --xlator-option
*-posix.glusterd-       uuid=2d576ff8-0cea-4f75-9e34-a5674fbf7256
--brick-port 49329 --xlator-option c_glusterfs-server.listen-port=49329)

3. The following log indicates that brick is up and is now started.
Refer to line 16123 in glusterd.log

[2016-04-03 10:14:25.336855] D [MSGID: 0]
[glusterd-handler.c:4897:__glusterd_brick_rpc_notify] 0-management:
Connected to 10.32.1.144:/opt/lvmdir/c2/brick

This clearly indicates that the brick is up and running as after that I
do not see any disconnect event been processed by glusterd for the brick
process.

Please note that all the logs referred and pasted are from 002500.

~Atin
> 
> 002500 - Board B that brick is offline
> 00300 - Board A logs
> 
>     >
>     > *Question : What could be contributing to brick offline?*
>     >
>     >
>     > --
>     >
>     > Regards
>     > Abhishek Paliwal
>     >
>     >
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>     >
> 
> 
> 
>