Hitachi VSP User and Reference Guide
2–52
Functional and Operational Characteristics
917 Dynamic
Provisioning
Dynamic
Provisioning
for Mainframe
Dynamic
Tiering
Dynamic
Tiering for
Mainframe
The mode is used to switch the method to migrate
data at rebalancing.
Mode 917 = ON (default):
Page usage rate is averaged among parity groups or
external volume groups where pool volumes are
defined.
Mode 917 = OFF:
Page usage rate is averaged among pool volumes
without considering parity groups or external
volume groups.
Notes:
1. The mode is applied when multiple LDEVs are
created in a parity group or external volume
group.
2. If the mode setting is changed during pool
shrink, the shrink processing may fail.
3. When the mode is set to OFF, the processing to
average page usage rate among pool volumes
in a parity group or external volume group
works; therefore, the drive workload becomes
high because the migration source and target
are in the same parity group or external volume
group.
4. When pool shrink is performed per pool VOL
from a parity group with multiple pool VOLs
defined (or from an external volume group)
while the mode is set to ON, the pool shrink
takes longer time compared to when the mode
is set to OFF.
ON
Mode Category Description Default MCU/RCU
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