TimeFinder SnapVX sessions can be created on SRDF source and target units, i.e. snap units can be assigned to both the source and the target unit of a remote copy pair. The snap unit and the source/target unit then form a snap pair in the context of a snap session. The source/target unit is then also the original unit of the snap pair.
When a snap pair consists of a target unit and a snap unit, access to the snap pair via the VSN or pubset ID is not possible because the target unit is generally not readable. If the source unit is attached, the pubset ID of the source unit can also be specified in the snap session commands using the UNIT=*BY-PUBSET(...) operand in conjunction with SELECT=*TARGET-UNIT.
Prerequisites for addressing a snap pair with target unit via the pubset ID or VSN:
SRDF mirroring takes place between two VMAX3 systems (not between VMAX3 and Symmetrix).
The source unit is attached.
Synchronous or asynchronous (SRDF/A) process mode must be set for
/START-SNAP-SESSION.
In SRDF configurations TimeFinder SnapVX supports the same scenarios as TimeFinder/Snap, see section “TimeFinder/Snap and SRDF (Symmetrix)”. The following must be borne in mind here:
The
/START-SNAP-SESSIONcommand generates and activates the snap session.For VMAX3, RA groups can currently be displayed but not managed with SHC-OSD.
SRDF source and SRDF target units cannot be used as snap units for TimeFinder SnapVX.