[Ocfs2-devel] OVM: O2CB_HEARTBEAT_THRESHOLD recommended/max value

[Srinivas Eeda]

which kernel ?

On 10/21/2015 06:53 AM, tomaz kosir wrote:
> Hi All,
>
> cst has ovm crash 2 weeks ago due to network outage. This has been 
> somehow fixed now.
> Now we are searching for some hints how to prevent such issues in the 
> feature.
> What we are thinking about is to increase o2cb timeouts.  If we 
> increase those timeouts to ie. 1h, does this mean we'll have 1hour to 
> fix network outage? Disk are connected directly, we have no issues 
> with that during network outage.
>
> There is interesting note Increase OC2B Cluster Heartbeat Timeout on 
> Exalogic Virtual (Doc ID 1995593.1):
>
>     A detailed step-by-step procedure is provided in this document to
>     increase the O2CB cluster heartbeat timeout from 5 min to a very
>     large value of 24 hr. The increased timeout effectively prevents a
>     catastrophic reboot of all compute nodes on an Exalogic rack in a
>     virtual configuration due to fencing, in the event of ZFS taking a
>     long time to complete a takeover.
>
>
> If O2CB_HEARTBEAT_THRESHOLD and O2CB_IDLE_TIMEOUT_MS are huge, OVS 
> servers will survive long network outage.
> What is much better then to get node crash which couse a lot of work 
> to setup cluster back to working state.
>
> Many thanks,
> Tomaž
>
> -- 
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