HP XP P9000 Business Copy User Guide (AV400-96573, July 2013)

Table 3 Volume Information for BC
Associated L2
P-VOL
AssociatedL2
S-VOLs
Associated L1
P-VOLs
Associated L1
S-VOLs
Pair Volume
Type
GID: LUNPortCU
NANANA1B-0:00,
2A-0:00,
2B-0:00
L1 P-VOL0:001A0
NANANA1B-0:01,
2A-0:01,
2B-0:01
L1 P-VOL0:011A0
NANANANANANANAetc...
NA3A-0:00,
3A-0:01
1A-0:00NAL1 S-VOL
L2 P-VOL
0:001B0
NA3B-0:00, 3B-0:011A-0:00NAL1 S-VOL0:011B0
L2 P-VOL
NANANANANANANAetc...
NA4A-0:00, 3B-0:011A-0:00NAL1 S-VOL0:002A0
L2 P-VOL
NA4B-0:00, 3B-0:011A-0:00NAL1 S-VOL0:012A0
L2 P-VOL
NANANANANANANAetc...
1B-0:00NANANAL2 S-VOL0:003A0
1B-0:00NANANAL2 S-VOL0:013A0
Planning for performance
Pair operations affect I/O performance on the storage system. The following information is provided
to help calibrate your system:
• Performance versus number of pairs. Compare the importance of performance with the number
of pairs and copy pace (rate at which data is copied).
◦ Assigning multiple S-VOLs to a P-VOL uses more system resources and lowers performance.
◦ The slower the copy pace, the less impact on I/O performance; a fast pace has a greater
impact on performance. (You assign copy pace while creating, splitting, and
resynchronizing pairs.)
• Load sharing on parity groups.
A parity group should contain an even distribution of P-VOLs and S-VOLs, rather than a
concentration of one or the other.
◦
◦ If you plan to perform multiple pair operations simultaneously, place the pairs in different
parity groups.
◦ For copy pace, specify Slower when you create, split, or resynchronize.
◦ If you plan to perform a copy operation on multiple pairs on the same parity group,
perform the operation on one pair at a time.
◦ If the system is overloaded, increase parity groups, cache, channel adapters (CHAs),
and/or disk adapters (DKAs). Assign S-VOLs to newly installed parity groups.
Planning for performance 17