HP StorageWorks XP Business Copy Software user guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1713-96027, April 2010)

NOTE:
BC leaf volumes (L2 cascade pair) also function as S-VOLs and must be reserved prior to being
assigned to an L2 cascade pair.
Reset reserve attribute operation
This operation unreserves a volume so it can be mounted and accessed by all hosts. After you reset
the reserve attribute, the disk array accepts all subsequent I/O operations to the volume. Use the Reset
Reserve Attribute window (see Resetting reserve attributes) to unreserve volumes.
Paircreate operation
This operation establishes the new BC pairs. The volume that will be the P-VOL must be in the SMPL
(simplex) state, and the volume that will be the S-VOL must be in the SMPL state before being added
to a BC pair.
NOTE:
You can reserve the S-VOL before creating a pair, but you can also create a pair with an unreserved
S-VOL. Use the Paircreate window (see Creating BC pairs (Paircreate)) to create new BC volume
pairs.
Initial copy operation
This operation occurs when you create a new volume pair (see Figure 2). The BC initial copy operation
copies all data on the P-VOL to the associated S-VOL. The P-VOL remains available to all hosts for
read and write I/Os throughout the initial copy operation. After the initial copy is complete, the update
copy operation duplicates write operations performed on the P-VOL during the initial copy operation
at the S-VOL.
Before the initial copy operation, the status of a pair is SMPL. The status of the pair is COPY(PD) (PD
= pending) while the initial copy operation is in progress. The status changes to PAIR when the initial
copy is complete. Write operations performed on the P-VOL during the initial copy operation are
duplicated at the S-VOL by update copy operations after the initial copy is complete.
CAUTION:
Even if a copy operation is completed without any host I/O, the data in the P-VOL and S-VOL may
not be identical. Whether the P-VOL and the S-VOL have the same data depends on the condition
of the disk array. To make the P-VOL and S-VOL data the same, split the pair and make the pair
status PSUS.
NOTE:
When creating pairs, you can select the pace for the initial copy operation: slower, medium, and
faster. The slower pace minimizes the impact of BC operations on disk array I/O performance, while
the faster pace completes the initial copy operation as quickly as possible.
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