HP XP Business Copy Software - Manual (Page 43)

For more information about specifying the copy pace, see Copy Pace list . For more information
about the Host I/O Performance option, see Host I/O Performance option .
Preparing for BC operations
System requirements
BC operations involve the disk array containing the primary and secondary volumes and the licensed
BC feature enabled on the Command View XP management station or XP Remote Web Console.
System requirements for BC are:
• Disk array hardware, microcode, and software required for BC operations must be installed and
enabled.
• Command View XP management station (user-supplied Windows-based PC) or XP Remote Web
Console.
• BC license key installed.
Preparing for BC operations
To ensure that you and your disk arrays are ready for BC operations, perform the following tasks:
• BC operations affect I/O performance of the disk array because of copy operations to the S-VOLs.
If you have not already done so, consider the relative importance of the disk array's I/O perform-
ance and the BC backup copies. For example, assigning three S-VOLs to each P-VOL takes more
resources than assigning one or two. You can also use the copy pace option to control the impact
of BC initial copy operations. Using a slower copy pace minimizes the impact of BC operations
on I/O performance, while a faster copy pace produces copies more quickly, but may affect I/O
performance.
• If you are using more than one disk array data management feature (such as BC, Continuous
Access XP, or Cache LUN) at the same time in the same disk array, contact your HP account support
representative to ensure that your disk array is optimized for your configuration of concurrent op-
erations. 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 13 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.
Table 13 Identifying the volumes for BC operations
Assoc.
L2 P-
VOL L2 S-
VOL Assoc. L2
S-VOLs L2 P-
VOL Assoc.
L1 P-
VOL L1 S-
VOL Assoc. L1
S-VOLs L1 P-
VOL TID:
LUN Port CU
— No — No — No
1B-0:00,
2A-0:00,
2B-0:00
Yes 0:00 1A 0
— No — No — No
1B-0:01,
2A-0:01,
2B-0:01
Yes 0:01 1A 0
XP Business Copy User Guide 43