Following up on this post:
Assume I have a system set up as described in the post above. I have one server - Server1 - in a cluster that has directly attached storage and the other - server2 - sees that directly attached storage as ISCSI or via some virtualized ISCSI arrangement or any other protocol that would allow clustering of drives. In that situation the directly attached storage on server 1 is a single point of failure. Assume I have the resources to attach an equivalent amount of directly attached storage to server B. Would any of the Virtual Storage Appliance software described in the original post - or any other software - allow me to mirror the directly attached storage on server A to the directly attached storage on server B? I am willing to look at both 'live' synchronization and not-so-live but very frequent synchronization - no more than an hour between synchronizations?