[ClusterLabs] OCFS2 on cLVM with node waiting for fencing timeout

emmanuel segura emi2fast at gmail.com
Mon Oct 10 10:49:54 EDT 2016


2016-10-10 16:46 GMT+02:00 Ulrich Windl <Ulrich.Windl at rz.uni-regensburg.de>:
> 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.
> This was not expected for a cluster filesystem (by me).
> I wonder: Is that expected bahavior?
> Regards,
> Ulrich
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