HP XP7 Storage - Manual (Page 32)

Table 2 System option modes (continued)
Description Mode
3. If this mode is not set to ON for both sides, the behavior is as follows:
- ON in the primary system/OFF in the secondary system: Cnt Ac-S Sync pair creation
fails.
- OFF in the primary system/ON in the secondary system: The update data is copied
to the S-VOL synchronously.
4. This mode cannot be applied to a Cnt Ac-J pair that is the second mirror in a Cnt
Ac-JxCnt Ac-J multi-target configuration, Cnt Ac-JxCnt Ac-J cascade configuration, or
3DC multi-target or cascading configuration of three Cnt Ac-J sites. If applied, Cnt
Ac-S pair creation is rejected with SSB=CBED output.
Enables the delta resync operation. 506
Mode 506 ON: The delta resync operation is performed if there are no update I/Os.
Mode 506 OFF: The copy processing of all data is performed if there is no update
I/Os.
Restricts copy or restore operations performed in the background to protect host I/O
performance related to the secondary storage system. 690
Mode 690 ON: Copy or restore is restricted when the Write Pending Rate on the
secondary system reaches or exceeds 60% (of cache memory capacity).
• When the Write Pending Rate of the restore journal volume’s CLPR reaches or exceeds
60%, copy operations are restricted.
•
When the Write Pending Rate of the S-VOL’s CLPR reaches or exceeds 60%, restore
operations are restricted.
Mode 690 OFF: Copy or restore is not restricted when the Write Pending Rate on the
secondary system reaches or exceeds 60.
Changes cache memory (CM) capacity allocated to MPBs with different workloads. 908
Mode 908 ON: Difference in CM allocation capacity among MPBs with different
workloads is large.
Mode 908 OFF (default): Difference in CM allocation capacity among MPBs with
different workloads is small.
Notes:
1. Apply this SOM to CLPRs used only for Cnt Ac-J JNLGs.
2. Since CM capacity allocated to MPBs with low workload is small, the performance
is affected by a sudden increase in workload.
3. This SOM is effective for a CLPR. Therefore, when setting this SOM to ON/OFF,
select target "LPRXX (XX=00 to 31)". For example, even when CLPR0 is defined
(CLPR1 to 31 are not defined), select "LPR00" first and then set the SOM to ON/OFF.
32 Planning volumes, XP7 systems