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List:       ocfs2-users
Subject:    [Ocfs2-users] OCFS2 CLUSTER HANG
From:       Javier Mugueta <javier.mugueta () oracle ! com>
Date:       2010-10-27 13:35:38
Message-ID: 5ef4e187-bb5b-4edf-bc10-2b99db2648be () default
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Hi,

IHAC with an OCFS2 1.4 2-node cluster in RedHat 5.3 x86-64.

Basically for explanation simplicity the software uses the cluster for writing in a \
log file up to 500Mb size, among other things (file read, etc)

Last monday there was a problem somewhere (software is a two-node application server) \
that caused the software to hang, and it seems both application servers was waiting \
each other for writing. Just restarting the application servers, the hypothetical \
deadlock was resolved.

Question: Is ocfs2 capable to detect the deadlock and fence one of the nodes in this \
situation?

The configuration is:

# 2010-02-10: OCFS2 cluster-aware filesystem configuration

kernel.panic_on_oops = 1

kernel.panic = 30

…


 [oracle@mapcms1 ocfs2]$ /etc/init.d/o2cb status

Driver for "configfs": Loaded

Filesystem "configfs": Mounted

Driver for "ocfs2_dlmfs": Loaded

Filesystem "ocfs2_dlmfs": Mounted

Checking O2CB cluster ucmcluster: Online

Heartbeat dead threshold = 31

  Network idle timeout: 30000

  Network keepalive delay: 2000

  Network reconnect delay: 2000

Checking O2CB heartbeat: Active


Regards

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