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

Business Copy XP user guide for the XP128/XP1024 33
representative to ensure that your disk array is optimized for your configuration of concurrent
operations. Each disk array feature can affect disk array performance and/or operation of other
features. For example, BC and
Continuous Access XP operations both involve initial copy and update
copy operations to secondary/remote volumes in addition to host I/O workload.
• Identify the volumes (LUs) you will use for BC operations. For each volume, write down the full SCSI
path (port, target ID (TID), and LUN), whether the volume will be a P-VOL or S-VOL, and the other
volumes in its pair (see Table 12 for a sample). LUN Manager displays this information. Volumes that
will be P-VOLs remain fully accessible to all hosts throughout normal BC operations, but volumes that
will be S-VOLs must be unmounted before being reserved for BC operations.
Combining BC with other data management operations
BC supports concurrent operations with the following data management functions:
• LU Size Expansion (LUSE). LUSE volumes can be assigned to BC pairs if the P-VOL and S-VOL have the
same LU type and number of LDEVs (same size). If you must perform LUSE operations on an existing BC
P-VOL or S-VOL, delete the pair first to return the volume to SMPL status.
• CVS. CVS volumes can be assigned to BC pairs if the S-VOL has the same capacity as the P-VOL. If you
must perform CVS operations on an existing BC P-VOL or S-VOL, delete the pair first to return the
volume to SMPL status.
• LUN Security. LUN Security operations do not affect BC operations. Volumes under secure ports and/or
assigned to World Wide Name (WWN) groups and/or LUN groups can also be assigned to BC
pairs. Volumes assigned to BC pairs can also be assigned to secure ports, WWN groups, and/or LUN
groups for LUN Security.
NOTE: BC S-VOLs cannot be accessed by any host except when the pair is split.
• Cache LUN. Cache LUN XP volumes can be assigned to BC pairs. Cache LUN XP operations can be
performed on BC P-VOLs and S-VOLs.
Table 12 Identifying the volumes for BC operations
CU Port TID:
LUN
L1
P-VOL
Assoc.
L1
S-VOLs
L1
S-VOL
Assoc.
L1
P-VOL
L2
P-VOL
Assoc.
L2
S-VOLs
L2
S-VOL
Assoc.
L2
P-VOL
0 1A 0:00 Yes 1B-0:00,
2A-0:00,
2B-0:00
No — No — No —
0 1A 0:01 Yes 1B-0:01,
2A-0:01,
2B-0:01
No — No — No —
etc.
0 1B 0:00 No — Yes 1A-0:00 Yes 3A-0:00,
3A-0:01
No —
0 1B 0:01 No — Yes 1A-0:01 Yes 3B-0:00,
3B-0:01
No —
etc.
0 2A 0:00 No — Yes 1A-0:00 Yes 4A-0:00,
3B-0:01
No —
0 2A 0:01 No — Yes 1A-0:01 Yes 4B-0:00,
3B-0:01
No —
etc.
0 3A 0:00 No — No — No — Yes 1B-0:00
0 3A 0:01 No — No — No — Yes 1B-0:00