HP XP Business Copy Software - Manual (Page 14)

14 Business Copy XP (BC) for the XP10000/XP12000
BC requirements for XP12000 and XP10000
BC operations provide disk array-internal copies of UNIX/PC server volumes (LUs) on the disk array. The
following table describes the operational requirements for BC.
Table 3 BC operational requirements for XP12000 and XP10000
Parameter Requirement
Pair objects Logical devices (LDEVs): OPEN-x (such as OPEN-3, OPEN-9, OPEN-E, and OPEN-V),
including CVS and LUSE volumes. Devices must be installed and configured. The
P-VOL and S-VOL must be the same type (for example, OPEN-3 to OPEN-3 is allowed,
OPEN-3 to OPEN-9 is not allowed).
A custom size P-VOL must be paired with S-VOLs of the same type and capacity. A
LUSE P-VOL must be paired with S-VOLs of the same size and structure. For example, if
a LUSE P-VOL is connected to volumes of 1GB, 2GB, and 3GB in this order, you must
specify the LUSE volume that has exactly the same size and connection order as the
S-VOL.
BC does not support multiplatform devices (for example, 3390-3A, -3B, -3C).
Snapshot XP pairs, virtual volumes, and pool volumes cannot be specified as P-VOLs
or S-VOLs.
Journal volumes for HP StorageWorks Continuous Access XP Journal cannot be
specified as P-VOLs or S-VOLs.
Volumes that form a Flex Copy XP pair cannot be specified as P-VOLs. A Flex Copy XP
P-VOL can be specified as a Business Copy XP S-VOL under certain conditions. Refer
to the HP StorageWorks Flex Copy XP user guide for more information.
BC operations can be performed with External Storage XP operations to create pairs
that use the external volumes as BC S-VOLs (or mirroring volumes) under the same
conditions applied to the volumes in the local disk array. Refer to the HP StorageWorks
External Storage XP user guide for more information.
Number of copies Maximum of three copies (S-VOLs) per primary volume (P-VOL). Maximum of one
P-VOL per S-VOL (P-VOLs cannot share an S-VOL).
An additional six copies can be created by using the BC cascade function.
Maximum number of
pairs 1
A maximum of 8,192 pairs (8,192 P-VOLs and 8,192 S-VOLs) can be created per
disk array.
NOTE: The maximum number of pairs equals the total number of BC, Snapshot XP,
ShadowImage for z/OS, Hitachi FlashCopy Mirroring, Hitachi FlashCopy Mirroring
Version 2, Auto LUN XP, and Flex Copy XP volume pairs.
When you use RAID Manager, the maximum number of BC pairs is 8,191 (8,191
P-VOLs and 8,191 S-VOLs).
If some BC pairs contain LUSE volumes, or if an application other than BC is used, the
maximum number of BC pairs might be less than 8,192 (or 8,191).
Refer to ”
Maximum number of pairs for the XP10000/XP12000” on page 15 for
information about calculating the maximum number of BC pairs.
Maximum number of
S-VOLs
8,192 (8,191 if RAID Manager is used).
MU (mirror unit) numbers
of cascade pairs
L1 pairs = 0, 1, and 2 (a total of 3 pairs)
L2 pairs =1 and 2 (a total of 2 pairs)
Combinations of RAID
levels (primary-
secondary)
All combinations supported: RAID1-RAID1, RAID5-RAID5, RAID6-RAID6,
RAID1-RAID5, RAID1-RAID6, RAID5-RAID1, RAID5-RAID6, RAID6-RAID1,
RAID6-RAID5.