CLVM + DRBD dual primary? (was Re: replicated file system?)

[Michael ODonnell]

> To my knowledge DBRD can only do mirroring.  So no higher RAID
> levels are supported.

That's my understanding, too.  So, in an Active/Standby situation (at
least the ones in the configs we had rigged up) DRBD could provide you
with a hot block-level copy on the Standby machine that you'd hope to
carry on with after a failover.  However, being a hot copy means any
filesystem metadata would be in whatever state the failed node left
them, which may or may not be an acceptable risk in some situations.
Some sort of distributed filesystem (on redundant storage) shared among
all the machines in question seems preferable...