HP XP7 Owner's Manual page 49

Table 1 1 System option modes (continued)
Mode Category
Continuous Access
Journal Z
912 Smart Tiers
Smart Tiers Z
917 Thin Provisioning
Thin Provisioning Z
Smart Tiers
Smart Tiers Z
Description
The difference in CM allocation capacity among MPBs with
different workload is large.
Mode 908 = OFF (default):
The difference in CM allocation capacity among MPBs with
different workload is small (existing operation)
Notes:
1. 1. The mode is applied to a CLPR only used for UR JNLGs.
2. 2. Since CM capacity allocated to MPBs with low load is
small, the performance is affected by a sudden increase in
load.
When the mode is set to ON, Smart monitoring information of a
THP pool containing a THP VOL to which the per-page policy
setting is made is discarded
One hour or more is required from the time when the mode is set
to on to the time when the discarding processing is completed.
In addition, the per-page policy setting is prevented while the
mode is ON.
Mode 912 = ON:
Smart monitoring information of a THP pool containing a THP
VOL to which the per-page policy setting is made is discarded.
The following restrictions are applied to the THP pool.
1. When execution mode is Auto, monitoring the target THP pool
is disabled.
2. When execution mode is Manual, a request to start monitoring
the target THP pool is not accepted.
3. Monitoring information (weighted average information) of the
target THP pool is discarded.
Mode 912 = OFF (default):
Smart monitoring information of a THP pool containing a THP
VOL to which the per-page policy setting is made is not discarded.
Notes:
1. The mode is applied when the micro-program is downgraded
from V04 or higher to earlier than V04 while the per-page
policy setting has been made once. (including a case that the
per-page policy setting is once made and then released.)
2. After setting the mode to ON, wait for one hour or more until
the discarding processing is completed.
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
System option modes, host modes, and host mode options
Default MCU/RCU
ON
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