HP XP7 Storage - Manual (Page 14)

Requirement Item
Mainframe related • IBM PPRC is supported.
•
Optional error report communications (ERC) function requires MVS/DFP 3.2.0 or later.
• If the S-VOL is associated with a Cnt Ac-J Z P-VOL, and the primary or secondary
systems consist of several CPU complexes, a SYSPLEX timer is required to provide a
common time reference for the host I/O time-stamping function.
•
ICKDSF R16 + PTF functions require VM/ESA 2.1.0 or later.
Contact your HP account team for the latest information.
A maximum of eight data paths are supported from primary system CU to secondary
system CU. Data path
Fibre Channel (FICON), direct or with switch connections. See “Data path requirements
and configurations” (page 46) .
Remote paths •
A maximum of eight remote paths are supported from the primary system CU to the
secondary system CU.
• A primary system CU supports a maximum of 32 remote paths (8 paths per secondary
system CU x 4 supported secondary system CUs per primary system CU).
•
Remote paths are established separately for primary and secondary system CUs.
Maximum number of
secondary systems (CU) • A primary system CU can be paired with up to four secondary system CUs.
•
A primary system can have up to 1,020 paired secondary system CUs (255 primary
system CUs x maximum of 4 secondary system CUs).
• Each secondary system CU must be added (paired) individually to a primary system
CU.
Pair volumes •
The S-VOL must be equal-to or larger-than the P-VOL. However, when the S-VOL is
larger than the P-VOL, the swap operation cannot be performed.
•
The maximum size of the P-VOL and S-VOL is 0.9TB each.
•
A P-VOL may be copied to only one S-VOL.
• P-VOL and S-VOL can be shared with other HP software product volumes. See “Volume
types that can be shared with Continuous Access Synchronous Z” (page 50) .
See “Planning pairs and pair volumes” (page 34) for more information.
Limited per XP7 storage system. See “Maximum number of pairs supported” (page 37) . Number of pairs
Maximum: 256 (0x00 to 0xFF) Number of consistency
groups
Must be ensured by the user. The track format for the P-VOL and S-VOL must meet the
following requirements: Disk track format
•
The P-VOL and S-VOL must have the same track format.
• Record zero (R0) must be standard format, with key length of zero and data length of
eight. The primary system aborts the initial copy operation if R0 is not standard format.
•
The CCHH (logical cylinder address and logical head address) of R0 must be identical
to the physical cylinder address and physical head address of the track.
• The CCHH of each user record in a track must be unique.
14 Requirements and specifications