Mode
Category
Description
Default
MCU/RCU
For pair volumes of 4 TB (open)/262,668 Cyl (mainframe)
or less, differential BMP is managed in hierarchical memory
that performs caching to CM/PM using HDD as a master
and enables creation of pairs using user capacity in excess
of 1.8 PB per system.
Mode 1050= OFF (default):
For pair volumes of 4TB (OPEN)/262,668 Cyl (Mainframe)
or less, differential BMP is managed in SM as usual so that
the user capacity to create pairs is limited to 1.8 PB per
system. Also, differential MPB management can be
switched from the hierarchical memory to SM by
performing a resync operation for pairs whose volume
capacity is 4 TB (open)/ 262,668 Cyl (mainframe) or less.
Notes.
1.
This mode is related to SOM 1058.
2.
The hierarchical memory is used for volumes over 4
TB (open)/262,668 Cyl (mainframe) even when the
mode is set to OFF.
3.
When the mode is turned OFF after operating with
the mode set to ON, if resynchronizing pairs whose
volume capacity is 4TB (open)/262,668Cyl
(Mainframe) or less managed in the hierarchical
memory, the pair resync operation may fail due to
lack of the SM capacity.
4.
If a pair resync operation fails, the pairs exceeding
1.8 PB of user capacity need to be deleted.
5.
Open non-DP VOLs do not support hierarchical
memory differential management so that the mode
cannot be applied.
6.
To downgrade the microcode, the procedure
described in Maintenance Manual (Function ID 01:03
described in 03 MICRO-FC) is required. Refer to the
manual before applying the mode.
7.
The mode is applied when pair creation using user
capacity exceeding 1.8 PG per system is desired.
8.
Depending on the I/O pattern, I/O response might be
affected.
9.
Depending on the condition, initial copy time might
be affected
10.
The differential BMP managed in hierarchical memory
does not use the shared memory, but the differential
data is managed in a pool with which the volumes
are associated. For the pool capacity necessary for
the differential data management, refer to
“Differential Data” in the Hitachi TrueCopy® User
Guide, Hitachi TrueCopy® for Mainframe User Guide,
Hitachi Universal Replicator User Guide, Hitachi
Universal Replicator for Mainframe User Guide, and
the Global-Active Device User Guide.
11.
Before using this SOM to increase pair volumes on
the storage system, check the resources on the
storage system to make sure all performance
requirements are met.
170
System option modes
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Содержание F1500
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Страница 132: ...132 Specifications Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 182: ...182 System option modes Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 204: ...204 Glossary Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
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