[Linux-cluster] best qdisk location

[emmanuel segura]

Sorry i don't have any document about this topic, but the problem it's
logical

example: if my database make intensive IO on the lun where my qdisk reside
the node take fencing because cannot write to the qdisk

2012/1/25 Jan Huijsmans <Jan.Huijsmans at interaccess.nl>

> > I always used the second option and I never found any problem
>
> Sounds good, but is there any documentation on this subject? I would like
> to advise a
> conversion to the separate LUN set-up, but I need to convince the
> administrators to
> switch from the current set-up. (which presumable was advised by RedHat)
>
> 2012/1/25 Jan Huijsmans <Jan.Huijsmans at interaccess.nl<mailto:
> Jan.Huijsmans at interaccess.nl>>
> Hello,
>
> When checking the RedHat cluster set-up I was surprised to find the quorum
> disk located
> on the same LUN as the database. This location was chosen because the
> database LUN
> needs to be accessible for the node to be able to service the environment.
> It's a logical choice.
>
> However, at this moment we're experiencing latency on the storage, which
> also hinders
> the usage of the qdisk. There are lots of time-outs on disk activity which
> won't hinder the
> application much, at least when the cluster won't reboot due to time-outs
> on the qdisk.
>
> For me the logical choice for the qdisk would be a separate LUN on a fast
> disk, we have
> a quorum disk library for the SAN with unused disks, instead on the same
> LUN that's
> being used by the application. (in a cabinet that's used by the complete
> environment.
>
> This way the qdisk can be fast and it's a real quorum LUN, as it's located
> on the quorum
> location of the SAN controllers.
>
> My main question is which method would give the most stable environment
> for the cluster.
>
> 1. qdisk on same LUN as application
> 2. qdisk on separate, isolated, LUN
>
> I would choose the second option, but I'm not sure which would give the
> stability I'm seeking.
>
> Greetings,
>
> Jan Huijsmans
>
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esta es mi vida e me la vivo hasta que dios quiera
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