User guide

B–16 System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
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 .
Mode Category Description Default
MCU/
RCU