HP StorageWorks SAN Virtualization Services Platform 2.1 release notes (5697-8060, March 2009)

Virtual disk not added to async mirror group with
AddDiskToVirtualDiskGroupWithAsyncMirror command
With the AddDiskToVirtualDiskGroupWithSyncMirror command, a disk can be added to
a virtual disk group that has an asynchronous mirror, but an error message is received, and the disk
is not added to the asynchronous mirror group. The workaround is to perform this task with the VSM
GUI. HP is working to resolve this issue.
HP StorageWorks SAN Virtualization Services Platform 2.1 release notes 19