[Lustre-discuss] advice on OST journals in OSS failover pairs

[Andreas Dilger]

The external journal is an important part of whatever filesystem is using it, so it needs to be available on any node that is serving this filesystem (i.e. on the primary or failover OSS for each OST).

Cheers, Andreas

On 2011-02-13, at 16:54, Samuel Aparicio <saparicio at bccrc.ca> wrote:

> We are planning OSS failover pairs for a lustre deployment, the question of external journals comes up.
> testing showed that for our applications having an external journal for the OSTs provides a worthwhile increase in performance.
> 
> For a failover pair this presumably means that the OST journals should have to reside on an external storage target that each OSSs pair can see?
> Or would the MDS journal take over in the case of an OSS switchover?
> 
> thanks 
> 
> sam aparicio
> 
> Professor Samuel Aparicio BM BCh PhD FRCPath
> Nan and Lorraine Robertson Chair UBC/BC Cancer Agency
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