[Gluster-users] uninterruptible processes writing to glusterfsshare

Tue Jun 7 06:15:38 UTC 2011

I had similar problem, php-fpm sometime(once per 1 - 2 weeks ) hang,
process is waiting for some IO, gluster itself is working ok, server
reboot is only solution. Nothing in logs, nothing in dmesg. Gluster
version 3.2, kernel 2.6.34, running under xen, distribution gentoo. It
start after gluster installation, never had this problem with previous
openafs ( many other problems :))) ).

Matus

2011/6/6 Anthony J. Biacco <abiacco at formatdynamics.com>:
> Could be fuse, check 'dmesg' for kernel module timeouts.
>
> In a similar vein, has anyone seen signifigant performance/reliability with diff fuse versions? say, latest source vs. Rhel distro rpms vers.
>
> -Tony
>
>
>
> -----Original Message-----
> From: Mohit Anchlia <mohitanchlia at gmail.com>
> Sent: June 06, 2011 1:14 PM
> To: Markus Fröhlich <markus.froehlich at xidras.com>
> Cc: gluster-users at gluster.org <gluster-users at gluster.org>
> Subject: Re: [Gluster-users] uninterruptible processes writing to glusterfsshare
>
> Is there anything in the server logs? Does it follow any particular
> pattern before going in this mode?
>
> Did you upgrade Gluster or is this new install?
>
> 2011/6/6 Markus Fröhlich <markus.froehlich at xidras.com>:
>> hi!
>>
>> sometimes we've on some client-servers hanging uninterruptible processes
>> ("ps aux" stat is on "D" ) and on one the CPU wait I/O grows within some
>> minutes to 100%.
>> you are not able to kill such processes - also "kill -9" doesnt work - when
>> you connect via "strace" to such an process, you wont see anything and you
>> cannot detach it again.
>>
>> there are only two possibilities:
>> killing the glusterfs process (umount GFS share) or rebooting the server.
>>
>> the only log entry I found, was on one client - just a single line:
>> [2011-06-06 10:44:18.593211] I [afr-common.c:581:afr_lookup_collect_xattr]
>> 0-office-data-replicate-0: data self-heal is pending for
>> /pc-partnerbet-public/Promotionaktionen/Mailakquise_2009/Webmaster_2010/HTML/bilder/Thumbs.db.
>>
>> one of the client-servers is a samba-server, the other one a backup-server
>> based on rsync with millions of small files.
>>
>> gfs-servers + gfs-clients: SLES11 x86_64, glusterfs V 3.2.0
>>
>> and here are the configs from server and client:
>> server config
>> "/etc/glusterd/vols/office-data/office-data.gfs-01-01.GFS-office-data02.vol":
>> volume office-data-posix
>>    type storage/posix
>>    option directory /GFS/office-data02
>> end-volume
>>
>> volume office-data-access-control
>>    type features/access-control
>>    subvolumes office-data-posix
>> end-volume
>>
>> volume office-data-locks
>>    type features/locks
>>    subvolumes office-data-access-control
>> end-volume
>>
>> volume office-data-io-threads
>>    type performance/io-threads
>>    subvolumes office-data-locks
>> end-volume
>>
>> volume office-data-marker
>>    type features/marker
>>    option volume-uuid 3c6e633d-a0bb-4c52-8f05-a2db9bc9c659
>>    option timestamp-file /etc/glusterd/vols/office-data/marker.tstamp
>>    option xtime off
>>    option quota off
>>    subvolumes office-data-io-threads
>> end-volume
>>
>> volume /GFS/office-data02
>>    type debug/io-stats
>>    option latency-measurement off
>>    option count-fop-hits off
>>    subvolumes office-data-marker
>> end-volume
>>
>> volume office-data-server
>>    type protocol/server
>>    option transport-type tcp
>>    option auth.addr./GFS/office-data02.allow *
>>    subvolumes /GFS/office-data02
>> end-volume
>>
>>
>> --------------
>> client config "/etc/glusterd/vols/office-data/office-data-fuse.vol":
>> volume office-data-client-0
>>    type protocol/client
>>    option remote-host gfs-01-01
>>    option remote-subvolume /GFS/office-data02
>>    option transport-type tcp
>> end-volume
>>
>> volume office-data-replicate-0
>>    type cluster/replicate
>>    subvolumes office-data-client-0
>> end-volume
>>
>> volume office-data-write-behind
>>    type performance/write-behind
>>    subvolumes office-data-replicate-0
>> end-volume
>>
>> volume office-data-read-ahead
>>    type performance/read-ahead
>>    subvolumes office-data-write-behind
>> end-volume
>>
>> volume office-data-io-cache
>>    type performance/io-cache
>>    subvolumes office-data-read-ahead
>> end-volume
>>
>> volume office-data-quick-read
>>    type performance/quick-read
>>    subvolumes office-data-io-cache
>> end-volume
>>
>> volume office-data-stat-prefetch
>>    type performance/stat-prefetch
>>    subvolumes office-data-quick-read
>> end-volume
>>
>> volume office-data
>>    type debug/io-stats
>>    option latency-measurement off
>>    option count-fop-hits off
>>    subvolumes office-data-stat-prefetch
>> end-volume
>>
>>
>>  -- Mit freundlichen Grüssen
>>
>> Markus Fröhlich
>> Techniker
>>
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