Hitachi Virtual Storage Platform - Page 60

Hitachi VSP User and Reference Guide
2–32
Functional and Operational Characteristics
725
part 2
of 2
Universal
Volume
Manager
Notes: (continued)
3. While USP V/VM is used as an external
subsystem and its volume is DP-VOL, if SOM e Pool-
VOLs constituting the DP-VOL are blocked, external
path blockade and recovery occurs repeatedly.
4. When 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 Dynamic
Provisioning
Data Retention
Utility
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