Hi,
On 10/10/2016 10:46 PM, Ulrich Windl wrote:
Hi!
I observed an interesting thing: In a three node cluster (SLES11 SP4) with cLVM
and OCFS2 on top, one node was fenced as the OCFS2 filesystem was somehow busy
on unmount. We have (for paranoid reasons mainly) an excessive long fencing
timout for SBD: 180 seconds
While one node was actually reset immediately (the cluster was still waiting for the fencing
to "complete" through timeout), the other nodes seemed to freeze the filesystem.
Thus I observed a read delay > 140 seconds on one node, the other was also close to 140
seconds.
ocfs2 and cLVM are both depending on DLM. DLM deamon will notify them to stop service (which
means any cluster locking
request would be blocked) during the fencing process.
So I'm wondering why it takes so long to finish the fencing process?
Eric
This was not expected for a cluster filesystem (by me).
I wonder: Is that expected bahavior?
Regards,
Ulrich
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