HP StorageWorks Business Copy XP user guide for the XP128/XP1024 (December 2005)

34 Business Copy XP (BC) for the XP128/XP1024
CAUTION: See ”Pairresync operations” on page 19 for important information on performing quick
restore operations on Cache LUN XP volumes.
• Continuous Access XP. Continuous Access XP volumes can be assigned to BC pairs, and BC volumes
can be assigned to
Continuous Access XP pairs. See ”Combining BC and Continuous Access XP
operations” on page 34 for important information on BC and
Continuous Access XP shared volume
configurations.
• Auto LUN XP. BC can be assigned to Auto LUN XP migration volumes. However, if the BC P-VOL is
already paired with three S-VOLs, delete the BC pairs before migrating the volumes. Also, to assign BC
volumes to destination migration volumes or reserve BC volumes for Auto LUN XP, delete the BC
volumes or unreserve the BC volumes before using them with Auto LUN XP. If you assign a BC P-VOL
that is already paired with three S-VOLs to Auto LUN XP migration volumes, or assign BC volumes to
Auto LUN XP volumes other than migration volumes, the command will be rejected.
If you split the BC pair assigned to Auto LUN XP migration volumes, migration of those volumes will be
canceled.
NOTE: You cannot use Auto LUN XP migration, destination, and reserved volumes for BC pair
operations (the command will be rejected). To use Auto LUN XP volumes for BC pair operations, use
Auto LUN XP to release the volumes.
Combining BC and Continuous Access XP operations
BC and Continuous Access XP can function together in the same disk array to provide both internal and
remote backup for important data.
NOTE:
• BC is recommended for intra-disk array copy operations. If BC is not installed, use
Continuous Access XP
(synchronous only) to copy within the same local disk array. This
Continuous Access XP configuration
requires at least one external ESCON® cable loop (minimum of two is recommended).
• Combining BC L1 and L2 pairs with
Continuous Access XP volumes is allowed. Continuous Access XP
considers node and leaf volumes secondary volumes (S-VOLs).
NOTE: Reverse resync and quick restore operations cannot be performed on BC/Continuous Access XP
shared volume pairs.
The configuration shown in Figure 10 is an example of a volume functioning as both a Continuous Access
XP P-VOL and BC P-VOL. With this configuration, you can perform the following:
• Use BC to provide on-site backup copies of
Continuous Access XP P-VOLs