HP XP7 Storage - Manual (Page 22)

without interrupting access to the data. See the following IBM publications for important information
about the requirements and procedures for P/DAS operations: Planning for IBM Remote Copy
(SG24-2595), Advanced Copy Services (SC35-0355), DFSMS MVS V1 Remote Copy Guide and
Reference (SC35-0169).
Restrictions
The following restrictions apply to P/DAS use with Continuous Access Synchronous Z:
•
P/DAS through channel extenders is not supported.
•
P/DAS does not support CFW operations. You must stop CFW applications before performing
P/DAS operations on Continuous Access Synchronous Z volumes.
•
P/DAS swap option #2 (switch pair & swap) is supported for P/DAS between the P9500 and
XP12000 Disk Array/XP10000 Disk Array.
Contact your HP account team for the latest information about P/DAS support.
GDPS support
Continuous Access Synchronous Z provides remote copy support for IBM’s Geographically Dispersed
Parallel Sysplex® (GDPS) facility. GDPS is an IBM service 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 P9500’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; for example, CGROUP (FREEZE/RUN). GDPS support may have
additional installation requirements for Continuous Access Synchronous Z primary and secondary
systems, depending on the P9500 firmware and Continuous Access Synchronous Z versions. Check
with your HP representative.
The P9500 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 more information about GDPS, see 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).
RMF PPRC link path statistical information support
When you use the Resource Measurement Facility (RMF) and specify the IBM TotalStorage Enterprise
Storage Server® (ESS), you can acquire PPRC fibre link path statistical information.
If the total size of the data for the data-acquisition interval is 100 kB or less, zero may be reported
for the data size.
The P9500 storage system adaptor IDs (SAID) for the LINK parameters (ports) that display when
PPRC link path statistical information is acquired with RMF are shown in:
•
“SAID values for link path statistical information (CL1)”
•
“SAID values for link path statistical information (REAR CL2)”
22 Requirements and specifications