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

[Samuel Aparicio]

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