[Gluster-users] After reboot, one brick is not being seen by clients
Ravishankar N
ravishankar at redhat.com
Thu Nov 28 17:32:16 UTC 2013
On 11/28/2013 09:30 PM, Patrick Haley wrote:
> Hi Ravi,
>
> I'm pretty sure the clients use fuse mounts. The relevant line from /etc/fstab is
>
> mseas-data:/gdata /gdata glusterfs defaults,_netdev 0 0
>
>
> gluster-data sees the other bricks as connected. The other bricks see each
> other as connected but gluster-data as disconnected:
>
> ---------------
> gluster-data:
> ---------------
> [root at mseas-data ~]# gluster peer status
> Number of Peers: 2
>
> Hostname: gluster-0-1
> Uuid: 393fc4a6-1573-4564-971e-1b1aec434167
> State: Peer in Cluster (Connected)
>
> Hostname: gluster-0-0
> Uuid: 3619440a-4ca3-4151-b62e-d4d6bf2e0c03
> State: Peer in Cluster (Connected)
>
> -------------
> gluster-0-0:
> --------------
> [root at nas-0-0 ~]# gluster peer status
> Number of Peers: 2
>
> Hostname: gluster-data
> Uuid: 22f1102a-08e6-482d-ad23-d8e063cf32ed
> State: Peer in Cluster (Disconnected)
>
> Hostname: gluster-0-1
> Uuid: 393fc4a6-1573-4564-971e-1b1aec434167
> State: Peer in Cluster (Connected)
>
> -------------
> gluster-0-1:
> --------------
> [root at nas-0-1 ~]# gluster peer status
> Number of Peers: 2
>
> Hostname: gluster-data
> Uuid: 22f1102a-08e6-482d-ad23-d8e063cf32ed
> State: Peer in Cluster (Disconnected)
>
> Hostname: gluster-0-0
> Uuid: 3619440a-4ca3-4151-b62e-d4d6bf2e0c03
> State: Peer in Cluster (Connected)
>
> Does any of this suggest what I need to look at next?
Hi Patrick,
If gluster-data is pingable from the other bricks, you could try
detaching and retttaching it from gluster-0-0 or 0-1.
1) On gluster-0-0:
`gluster peer detach gluster-data`, if that fails, `gluster peer
detach gluster-data force`
2) On gluster-data:
`rm -rf /var/lib/glusterd`
`service glusterd restart`
3) Again on gluster-0-0:
'gluster peer probe gluster-data'
Now check if things work.
PS:You should really do a 'reply-to-all' so that your queries reach a
wider audience, getting you faster responses from the community. Also
serves as a double-check in case I goof up :)
I'm off to sleep now.
>
> Thanks.
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Pat Haley Email: phaley at mit.edu
> Center for Ocean Engineering Phone: (617) 253-6824
> Dept. of Mechanical Engineering Fax: (617) 253-8125
> MIT, Room 5-213 http://web.mit.edu/phaley/www/
> 77 Massachusetts Avenue
> Cambridge, MA 02139-4301
>
>
> ________________________________________
> From: Ravishankar N [ravishankar at redhat.com]
> Sent: Thursday, November 28, 2013 2:48 AM
> To: Patrick Haley
> Cc: gluster-users at gluster.org
> Subject: Re: [Gluster-users] After reboot, one brick is not being seen by clients
>
> On 11/28/2013 12:52 PM, Patrick Haley wrote:
>> Hi Ravi,
>>
>> Thanks for the reply. If I interpret the output of gluster volume status
>> correctly, glusterfsd was running
>>
>> [root at mseas-data ~]# gluster volume status
>> Status of volume: gdata
>> Gluster process Port Online Pid
>> ------------------------------------------------------------------------------
>> Brick gluster-0-0:/mseas-data-0-0 24009 Y 27006
>> Brick gluster-0-1:/mseas-data-0-1 24009 Y 7063
>> Brick gluster-data:/data 24009 Y 2897
>> NFS Server on localhost 38467 Y 2903
>> NFS Server on gluster-0-1 38467 Y 7069
>> NFS Server on gluster-0-0 38467 Y 27012
>>
>> For completeness, I tried both "service glusterd restart" and
>> "gluster volume start gdata force". Neither solved the problem.
>> Note that after "gluster volume start gdata force" the gluster volume status
>> failed
>>
>> [root at mseas-data ~]# gluster volume status
>> operation failed
>>
>> Failed to get names of volumes
>>
>> Doing another "service glusterd restart" let the "gluster volume status"
>> command work, but the clients still don't see the files on mseas-data.
> Are your clients using fuse mounts or NFS mounts?
>> A second piece of data, on the other bricks, "gluster volume status"does not
>> show gluster-data:/data:
> Hmm, could you check if all 3 bricks are connected ? `gluster peer
> status` on each brick should show the others as connected.
>> [root at nas-0-0 ~]# gluster volume status
>> Status of volume: gdata
>> Gluster process Port Online Pid
>> ------------------------------------------------------------------------------
>> Brick gluster-0-0:/mseas-data-0-0 24009 Y 27006
>> Brick gluster-0-1:/mseas-data-0-1 24009 Y 7063
>> NFS Server on localhost 38467 Y 27012
>> NFS Server on gluster-0-1 38467 Y 8051
>>
>> Any thoughts on what I should look at next?
> Also noticed the NFS server process on gluster-0-1 (on which I guess no
> commands were run ) seems to have changed it's pid from 7069 to 8051.
> FWIW, I am able to observe a similar bug
> (https://bugzilla.redhat.com/show_bug.cgi?id=1035586) which needs to be
> investigated.
>
> Thanks,
> Ravi
>> Thanks again.
>>
>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>> Pat Haley Email: phaley at mit.edu
>> Center for Ocean Engineering Phone: (617) 253-6824
>> Dept. of Mechanical Engineering Fax: (617) 253-8125
>> MIT, Room 5-213 http://web.mit.edu/phaley/www/
>> 77 Massachusetts Avenue
>> Cambridge, MA 02139-4301
>>
>>
>> ________________________________________
>> From: Ravishankar N [ravishankar at redhat.com]
>> Sent: Wednesday, November 27, 2013 11:21 PM
>> To: Patrick Haley; gluster-users at gluster.org
>> Subject: Re: [Gluster-users] After reboot, one brick is not being seen by clients
>>
>> On 11/28/2013 03:12 AM, Pat Haley wrote:
>>> Hi,
>>>
>>> We are currently using gluster with 3 bricks. We just
>>> rebooted one of the bricks (mseas-data, also identified
>>> as gluster-data) which is actually the main server. After
>>> rebooting this brick, our client machine (mseas) only sees
>>> the files on the other 2 bricks. Note that if I mount
>>> the gluster filespace (/gdata) on the brick I rebooted,
>>> it sees the entire space.
>>>
>>> The last time I had this problem, there was an error in
>>> one of our /etc/hosts file. This does not seem to be the
>>> case now.
>>>
>>> What else can I look at to debug this problem?
>>>
>>> Some information I have from the gluster server
>>>
>>> [root at mseas-data ~]# gluster --version
>>> glusterfs 3.3.1 built on Oct 11 2012 22:01:05
>>>
>>> [root at mseas-data ~]# gluster volume info
>>>
>>> Volume Name: gdata
>>> Type: Distribute
>>> Volume ID: eccc3a90-212d-4563-ae8d-10a77758738d
>>> Status: Started
>>> Number of Bricks: 3
>>> Transport-type: tcp
>>> Bricks:
>>> Brick1: gluster-0-0:/mseas-data-0-0
>>> Brick2: gluster-0-1:/mseas-data-0-1
>>> Brick3: gluster-data:/data
>>>
>>> [root at mseas-data ~]# ps -ef | grep gluster
>>>
>>> root 2781 1 0 15:16 ? 00:00:00 /usr/sbin/glusterd -p
>>> /var/run/glusterd.pid
>>> root 2897 1 0 15:16 ? 00:00:00 /usr/sbin/glusterfsd
>>> -s localhost --volfile-id gdata.gluster-data.data -p
>>> /var/lib/glusterd/vols/gdata/run/gluster-data-data.pid -S
>>> /tmp/e3eac7ce95e786a3d909b8fc65ed2059.socket --brick-name /data -l
>>> /var/log/glusterfs/bricks/data.log --xlator-option
>>> *-posix.glusterd-uuid=22f1102a-08e6-482d-ad23-d8e063cf32ed
>>> --brick-port 24009 --xlator-option gdata-server.listen-port=24009
>>> root 2903 1 0 15:16 ? 00:00:00 /usr/sbin/glusterfs -s
>>> localhost --volfile-id gluster/nfs -p
>>> /var/lib/glusterd/nfs/run/nfs.pid -l /var/log/glusterfs/nfs.log -S
>>> /tmp/d5c892de43c28a1ee7481b780245b789.socket
>>> root 4258 1 0 15:52 ? 00:00:00 /usr/sbin/glusterfs
>>> --volfile-id=/gdata --volfile-server=mseas-data /gdata
>>> root 4475 4033 0 16:35 pts/0 00:00:00 grep gluster
>>> [
>>>
>> From the ps output, the brick process (glusterfsd) doesn't seem to be
>> running on the gluster-data server. Run `gluster volume status` and
>> check if that is indeed the case. If yes, you could either restart
>> glusterd on the brick node (`service glusterd restart`) or restart the
>> entire volume (`gluster volume start gdata force`) which should bring
>> back the brick process online.
>>
>> I'm not sure why glusterd did not start the brick process when you
>> rebooted the machine in the first place. You could perhaps check the
>> glusterd log for clues).
>>
>> Hope this helps,
>> Ravi
>>
>>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>>> Pat Haley Email: phaley at mit.edu
>>> Center for Ocean Engineering Phone: (617) 253-6824
>>> Dept. of Mechanical Engineering Fax: (617) 253-8125
>>> MIT, Room 5-213 http://web.mit.edu/phaley/www/
>>> 77 Massachusetts Avenue
>>> Cambridge, MA 02139-4301
>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
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