Not mirroring certain volumes

[Dmitry@Rivermine]

Hi, would it make sense not to mirror certain types of volumes in an application. For example, a "swap" volume doesn't really need to be mirrored.

I'm also thinking that any instantiable class volumes don't need to be mirrored because if they get corrupted one can simply rebuild them from the catalog. (And nobody should keep any "perishable" data on instantiable volumes)

Do you think any of these can improve performance of an application?

[Chris]

Not mirroring a volume typically doesn't speed up performance, may want to check this thread out -

http://forum.3tera.com/showthread.php?t=224

I've also done some tests of my own and performance difference was negligible.

[PeterNic]

Thanks, Chris, for answering and providing the test data.

Also, another reason not to remove mirroring: if the only stream is on a server that dies, even if your appliance is not on it, it will stop working (as its boot and/or swap volumes will disappear). Keeping the volumes mirrored prevents this failure, as there will be another mirror that the appliance will continue using.

Regards,
-- Peter