HP XP P9500 Owner's Manual page 30

Table 1 1 System option modes (continued)
Mode Category
484 Continuous Access
Synchronous Z
Business Copy Z
491 Business Copy
Business Copy Z
30 Functional and operational characteristics
Description
- Initial copy operation is prioritized over update I/O. Therefore,
the processing speed of the update I/O slows down by about
15?s per command.
3. If this mode is set to ON, the processing speed of update I/O
slows down by about 15?s per command, version downgrade
is disabled, and Take Over is not available.
4. If the mode is not set to ON for both or either sides, the
behavior is as follows.
- Without setting on both sides: Normal UR initial copy
performance.
- With setting on MCU/without setting on RCU: TC Sync pair
creation fails.
- Without setting on MCU/with setting on RCU: The update data
for P-VOL is copied to the S-VOL in synchronous manner.
- While the mode is set to ON, micro-program downgrade is
disabled.
- While the mode is set to ON, Take Over function is disabled.
- The mode cannot be applied to a UR pair that is the 2nd mirror
in URxUR multi-target configuration or URxUR cascade
configuration. If applied, TC pair creation is rejected with
SSB=CBEE output.
The IBM-compatible PPRC FC path interface has been supported
with RAID500 50-06- 1 1-00/00. As the specification of QUERY
display using this interface (hereinafter called New Spec) is
different from the current specification (hereinafter called Previous
Spec), this mode enables to display the PPRC path QUERY with
the New Spec or Previous Spec.
Mode 484 = ON:
PPRC path QUERY is displayed with the New Spec.
Mode 484 = OFF (default):
PPRC path QUERY is displayed with the Previous Spec
(ESCON interface).
Note:
(1) Set this mode to ON when you want to maintain compatibility
with the Previous Spec for PPRC path QUERY display under the
environment where IBM host function (such as PPRC and GDPS)
is used.
(2) When an old model or a RAID500 that doesn't support this
mode is connected using Cnt Ac-S Z, set this mode to OFF.
(3) If the display specification is different between MCU and RCU,
it may cause malfunction of host.
(4) When TPC-R is used, which is IBM software for disaster
recovery, set this mode to ON.
Mode 491 is used for improving the performance of Business
Copy/ Business Copy Z/ ShadowImage FCv1.
Mode ON: The option (Reserve05) of Business Copy/ Business
Copy Z is available. If the option is set to ON, the copy of
Business Copy/ Business Copy Z/ ShadowImage FCv1 will be
performed from 64 processes to 128 processes so that the
performance will be improved.
Mode OFF (default): The option (Reserve05) of Business Copy/
Business Copy Z is unavailable. The copy ofBusiness Copy/
Business Copy Z/ ShadowImage FCv1 is performed with 64
processes.
Default MCU/RCU
OFF MCU/RCU
OFF .