HP StorageWorks SVSP Virtualization Adapter for VMware Site Recovery Manager Application Notes (5697-0319, March 2010)

Virtual disk groups
The virtual disk group makes sure that all data blocks from a set of virtual disks are sent in the same
order that they were written on the primary system. If a mirroring failure occurs, the virtual disk group
also makes sure of data integrity when related data resides on multiple virtual disks.
Resignaturing
Each virtual disk is internally referred to in ESX by its UUID. Snapshot virtual disks or mirrored virtual
disks have the same UUID as their parent virtual disk. Resignaturing lets ESX assign a new UUID to
a replicated virtual disk, permitting the replicated virtual disk to be mounted at the same time as the
parent virtual disk. During installation, Site Recovery Manager automatically changes this value to 1.
After a failover, the original name of the datastore will be preappended with snap-<uniq no.>,
which may be renamed to the original name, if desired.
SVSP Virtualization Adapter for VMware Site Recovery Manager Application Notes 19