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Hi All,
I have a problem related to GFS deployment on a SAN volume,
SCENARIO:
Clustered Mail Server application
Environment: RedHat ES 3.0 Redhat Cluster Suite Cluster file system - GFS (ver 6.0) on ex3fs
DELL PowerEdge 1550 / 2650 / 1650 / 1750 EMC CX series HBA Qlogix 23xx
SET-UP DNS--> load balancer(s) --> cluster node + file lock management --> SAN (mutli LUN) single file lock manager in the cluster (one among the cluster nodes) 3 nodes in backend cluster to handle POP3 and SMTP requests data stored in SAN, block size 128K, read / write cache enabled
all the nodes have direct access to SAN through fibre channel
In the migration process , when there were 3 nodes , all the systems were running smoothly but ! when I added some more load (mailboxes) with 2 more backend nodes, after some time 2-3 nodes (any of the nodes in cluster) hanged with the following error:
Oct 24 11:04:29 c5 kernel: GFS: Assertion failed on line 599 of file inode.c Oct 24 11:04:29 c5 kernel: GFS: assertion: "(tmp_gh->gh_flags &GL_LOCAL_EXCL) || !(gh->gh_flags & GL_LOCAL_EXCL)" Oct 24 11:04:29 c5 kernel: GFS: time = 1095145469 Oct 24 11:04:29 c5 kernel: GFS: fsid=310farm:gfs01.2: glock = (4, 0) Oct 24 11:04:29 c5 kernel: Oct 24 11:04:29 c5 kernel: Kernel panic: GFS: Record message above and reboot.
(LOCK MANAGER STILL KEEPS RUNNING and other nodes function properly)
I tried with different configurations of Lock manager but failed to get it right.
Is the problem with
GFS (any limitations ?????????) I/O block size lock management or (my architecture itself)
How can i resolve this issue? I am unable to find out proper reason of this. Can someone of you who's had hands on this help me out?
Thanks for all those wonderful (non-witty) answers ! Thorough solutions on the above win a linux friend :-)!
- -- Regards Ritesh Agrawal -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
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