Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

2-50 About TrueCopy for z/OS Operations
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
GDPS Support
TrueCopy for z/OS provides remote copy support for IBM’s Geographically
Dispersed Parallel Sysplex
®
(GDPS) facility. GDPS is an IBM service offering for
mirroring data and balancing workload on storage systems spread across two
or more sites up to 40 km (~20 miles) apart. With this support, users who are
running IBM Parallel Sysplex systems can take advantage of the USP V’s suite
of remote copy options for data availability.
GDPS operations feature automatic control of groups of PPRC-managed
volumes using host-based scripts and PPRC commands (e.g., CGROUP
(FREEZE/RUN)). GDPS support may have additional installation requirements
for the USP V TCz MCUs and RCUs, depending on USP V microcode levels and
program product versions. Please check the following items with your Hitachi
representative:
• System option modes (e.g., 104).
Mode 104 must be ON for 3990 controller emulation (not valid for 2105 and
2107 emulation).
For further information on USP V system option modes related to TCz
operations, please refer to Table 2-2.
Mode 104 must be set before any TCz pairs are established in a GDPS
environment. If TCz pairs have already been established, you must release all
pairs and logical paths (CDELPAIR, CDELPATH), change the SSIDs and mode
settings on the MCUs and RCUs, and then re-establish the paths and pairs
(CESTPATH, CESTPAIR).
Note on LINK definitions in GDPS:
The USP V does not support controlling
the ‘Freeze Option’ through the CESTPATH LINK parameter. The ‘Freeze
Option’ must be controlled using the CGROUP option of CESTPATH. Please
make changes as needed to the CESTPATH LINK definitions in your GDPS
configuration files or configuration database.
For further information on GDPS, please refer to the following IBM
publications: Geographically Dispersed Parallel Sysplex: the S/390
®
Multi-site
Application Availability Solution, Executive Summary (GF22-5114); and
Geographically Dispersed Parallel Sysplex: the S/390 Multi-site Application
Availability Solution (GF22-5063).