Mode Category Description Default
MCU/R
CU
c. Applying this SOM is recommended when the
above condition (1) is not met and EMC CX series
or Fujitsu Fibre CAT CX series is used as an
external storage.(4) Applying this SOM is
recommended if the above condition
d. Is not met and a maintenance operation such as
firmware update causing controller reboot is
executed on the external storage side while a
storage system other than Hitachi product is used
as an external subsystem.
Continued
725 Universal
Volume
Manager
Continued
Notes (continued)
3. While USP V/VM is used as an external subsystem and
its volume is DP-VOL, if some Pool-VOLs constituting the
DP-VOL are blocked, a phenomenon of external path
blockade and recovery occurs repeatedly.
4. In the case that a virtual volume mapped by UVM is set
to pool-VOL and used as DP-VOL in local subsystem, this
SOM can be applied without problem.
OFF
729
up-
dated
Dynamic
Provisioning
To set the Protect attribute for the target DP-VOL using
Data Retention Utility (DRU), when any write operation is
requested to the area where the page allocation is not
provided at a time when the HDP Pool is full.
Mode 729 = ON: To set the Protect attribute for the target
DP-VOL using DRU, when any write operation is requested
to the area where the page allocation is not provided at a
time when the HDP pool is full. (Not to set in the case of
Read request.)
Mode 729 = OFF (default): Not to set the Protect attribute
for the target DP-VOL using DRU, when any write
operation is requested to the area where the page
allocation is not provided at a time when HDP pool is full.
Notes:
1. This SOM is applied when:
- The threshold of pool is high (e.g., 95%) and the
pool may be full.
- File system is used.
- Data Retention Utility is installed.
2. Since the Protect attribute is set for V-VOL, the Read
operation cannot be allowed as well.
3. When Data Retention Utility is not installed, the
desired effect is not achieved.
4. Protect attribute can be released from the Data
Retention window of Storage Navigator after releasing
the full status of the pool by adding a Pool-VOL.
OFF .
733 Volume
Migration
This option enables to suspend Volume Migration or Quick
Restore operation during LDEV-related
maintenance.RAID600:Mode 733 = ON:Volume Migration
OFF .
B-16
System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
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