HP 3PAR Application Software Suite for Microsoft Exchange - Manual (Page 65)

NOTE: VSS will wait for up to 10 seconds for the writers to freeze I/O, and this interval is not
configurable. In most cases 10 seconds is a sufficient window to successfully create a virtual copy.
However, in some circumstances under very heavy load, 10 seconds may not be enough and the
virtual copy will fail on this attempt, which is by design. VSS does not automatically retry the
shadow copy creation, you must retry the virtual copy creation using the Recovery Manager for
Exchange GUI or the command line.
NOTE: During virtual copy creation, Recovery Manager for Exchange dismounts and unmasks
the virtual copy device from the Windows server, and breaks the virtual copy away from VSS
control. During this process a “delayed write error” message may appear, or the message "the
system failed to flush data to the transaction log" may appear in the System Event Log. This is
normal.
NOTE: The -defer option defers log truncation until backup completion. This keeps the Exchange
writer in the “waiting for completion” state for that period.
(for Exchange 2007) If you specify the -both option during the CCR configuration, Recovery
Manager for Exchange first attempts to take a snapshot on the passive node, then it attempts to
take a snapshot on the active node. A success status indicates that at least one of the snapshots
was successfully created.
RMExch create 65