[ClusterLabs] Two-Node OCFS2 cluster keep rebooting each other

Digimer lists at alteeve.ca
Wed Jun 10 00:13:44 EDT 2015

On 10/06/15 12:03 AM, Andrei Borzenkov wrote:
> В Tue, 9 Jun 2015 21:53:41 -0600
> Jonathan Vargas <jonathan.vargas at alkaid.cr> пишет:
>> Thanks,
>> Those nodes do not need coordination between them. They have been working
>> so far until now without HA and OCFS2. A load balancer distributes the
>> requests between both nodes, they do not know about the existence of each
>> other.
>> However, they do require shared storage to work with the same data. Before
>> setting up the OCFS2 cluster, we have been syncing disks using rsync, but
>> it syncs each minute, not real time.
>> So, our requirement would depend on OCFS2, and it works, but not of an HA
>> and stonith setup I think. I see no way how it could add value to the
>> required solution. Or it does?
> You need coordination between nodes on write and even if you mount your
> system read-only you still have at least boot time journal replay. So
> no, your nodes cannot free run.
> You probably want to use NFS for this.


Shared storage requires coordination, full stop. If a node enters an
unknown state, fencing must be invoked to force it into a known state.
If you do not want to use fencing, then as Andrei says, use NFS.

Of course, NFS is then a SPoF.

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