Hitachi VSP G200 System Administration Manual page 375
Virtual storage platform gx00 and fx00
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Also See for VSP G200:
- User manual (326 pages) ,
- User and reference manual (531 pages) ,
- System administrator manual (368 pages)
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937
Dynamic
Provisioning
Dynamic Tiering
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
Description
* Zero data page reclamation by WriteSame and UNMAP
functions, and IO synchronous page reclamation are not
disabled.
Mode 930 = ON: All of the zero data page reclamation
operations in processing are stopped at once. (Also the zero
data reclamation cannot be newly started.)
Mode 930 = OFF (default): The zero data page
reclamation is performed.
For details about interactions with SOM 755, contact
customer support (see SOM930 sheet).
Notes:
1.
This SOM is applied when stopping or disabling zero
data page reclamation by user request is required.
2.
When this SOM is set to ON, the zero data page
reclamation does not work at all.
* Zero data page reclamation by Write Same and
UNMAP, and IO synchronous page reclamation can
work.
3.
When downgrading micro-program to a version that
does not support this SOM while this SOM is set to ON,
set this SOM to OFF after the downgrade.
* Because the zero data page reclamation does not
work at all while this SOM is set to ON.
4.
This SOM is related to SOM 755.
By setting this SOM to ON, HDT monitoring data is collected
even if the pool is a DP pool.
Mode 937 = ON: HDT monitoring data is collected even if
the pool is a DP pool.
Only Manual execution mode and Period mode are supported.
Mode 937 = OFF (default): HDT monitoring data is not
collected if the pool is a DP pool
Notes:
1.
This SOM is applied when HDT monitoring data
collection is required in DP environment.
2.
When HDT is already used, do not set this SOM to ON.
3.
For HDT monitoring data collection, shared memory for
HDT must be installed. For details, contact customer
support (see SOM937 sheet).
4.
If monitoring data collection is performed without
shared memory for HDT installed, an error is reported
and the monitoring data collection fails.
5.
Before removing the shared memory for HDT, set this
SOM to OFF and wait for 30 minutes.
6.
Tier relocation with monitoring data collected when this
SOM is set to ON is disabled.
7.
When DP is converted into HDT (after purchase of
software license), the collected monitoring data is
discarded.
System option modes
Default
MCU/RCU
OFF
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375
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