[Ocfs2-users] Avoid node reboot on timeout

[Sébastien RICCIO]

Hi,

Thanks for your answer. I think you're talking about that value:

O2CB_HEARTBEAT_THRESHOLD=100  (That we can't change when the cluster is up)

What I understood is that it's the value that is used for the node 
reboot ((100 * 2) + 1 seconds)
but isn't it also the delay that the other nodes, that are still up, 
lock the access (at least write)
to the storage in case a node goes down without without advertising it ?

I had the case that a node crashed completly and the other nodes were 
not allowing
writes to the storage and it seemed it was also about (100 * 2) + 1 seconds.

In that case, that would mean if I set a huge delay to avoid the reboot, 
it would raise another problem.
If a node crashes, the other nodes would never write again to the 
storage....

Maybe I'm wrong ...

Thanks again.

Cheers,
Sébastien




On 05.12.2012 18:56, srinivas eeda wrote:
> If you run ocfs2 file system in cluster mode, then all nodes have to
> heartbeat to each other on network and storage within a timeout value.
> You can increase the timeout values to tolerate huge delays.
>
> On 12/5/2012 1:47 AM, Sébastien RICCIO wrote:
>> Hi OCFS2 list :)
>>
>> We are currently using XCP (XenServer opensource) with mixed shared
>> storage (some NFS and some OCFS2).
>> Everything works quite well except that when we have a network
>> interruption or problem on the filer providing the ocfs2 iscsi target,
>> all the machines connected to it reboots after a certain amount of time,
>> instead of keeping to try  a reconnect.
>>
>> It seems it's due to ocfs2 that is fencing the node if it can't write to
>> the storage after an amount of time.
>>
>> With nfs we don't have this problem, if the nfs filer goes down it just
>> waits until it comes back and resume the operations.
>>
>> Since we use ocfs2 all the nodes are now rebooted, that means we have to
>> restart each VM and this take a long time.
>>
>> Is there a way to disable that ocfs2 behavior so our hosts doesn't
>> reboot automatically ?
>>
>> Thanks :)
>>
>> Cheers,
>> Sébastien
>>
>>
>>
>>
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