Functional and Operational Characteristics
2–11
Hitachi VSP User and Reference Guide
64
(cont)
TrueCopy for
Mainframe
Notes:
1. When all the following conditions are met, set
Mode 64=ON.
2. When all the following conditions are met, set
Mode 64=ON.
- Customer requests to stop the update I/O
operation to the RCU of a TrueCopy for
Mainframe pair for the whole subsystem.
- Disaster Recovery function such as GDPS,
HyperSwap, or Fail Over/ Fail Back, which
requires compatibility with IBM storage, is not
used as this Mode 64 operates without having
compatibility with IBM storage.
- Only Peer-to-Peer-Remote-Copy operation.
(Do not use it in combination with Business
Continuity Manager.)
3. Even though the Failover command is not an
applicable criterion, when executing the
Failover command while Mode 114 is ON, since
ports are not automatically switched, the
Failover command fails.
4. With increase of Sync pairs in subsystem, the
time period to report the completion of Freeze
command and RUN command gets longer
(estimate of time to report completion: 1
second per 1000 pairs), and MIH may occur.
.MCU/RCU
80 ShadowImage
for Mainframe
• For RAID 300/400/450 (SI for OPEN or
Mainframe) In response to the Restore
instruction from the host or Storage Navigator,
the following operation is performed regardless
of specifying Quick or Normal.
• For RAID 500/600/700 (SI for OPEN) In
response to the Restore instruction from the
host, if neither Quick nor Normal is specified,
the following operation is performed
Mode 80 = ON: Normal Restore / Reverse Copy is
performed.
Mode 80 = OFF: Quick Restore is performed.
Notes.
1. This mode is applied when the specification for
Restore of SI is switched between Quick (default)
and Normal.
2. The performance of Restore differs depending on
the Normal or Quick specification.
OFF -
87 ShadowImage Determines whether NormalCopy or QuickResync, if
not specified, is performed at the execution of
pairresync by CCI.
Mode 87 = ON: QuickResync is performed.
Mode 87 = OFF: NormalCopy is performed.
OFF -
104 HRC Changes the default CGROUP Freeze option. OFF MCU
Mode Category Description Default MCU/RCU
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