Table 7 System option modes (continued)
DescriptionMode
To create a Continuous Access Journal pair for delta resync operation in the 3DC
multitarget configuration, set this mode to ON.
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.
506
In the configuration where multiple MCUs share an RCU (Continuous Access Journal
Mx1 configuration), the mirror resynchronization or delta resync operation may fail
due to SSB=EB9D. SSB=EB9D is output as SSB log when the parameter of the
communication command is not saved in the shared memory. To reduce the number of
multiprocessing of the communication command issued from MCU to RCU for the status
transition of each pair, set this mode to ON. By setting this mode to ON, you can
prevent mirror resynchronization or delta resync operation from failing.
Mode 593 ON: The multiprocessing of the communication command issued from MCU
to RCU is up to 128 pairs per DKC.
Mode 593 OFF: The multiprocessing of the communication command issued from MCU
to RCU is up to 1024 pairs per DKC.
593
The host I/O response might decrease while the Continuous Access Journal pair is
resynchronized. To suppress increase in the MP utilization rate by the differential bitmap
retrieval processing when resynchronizing the pair, set this mode to ON.
Mode 760 ON: Decrease in host I/O response during the Continuous Access Journal
resync operation is reduced.
Mode 760 OFF: Normal operations are performed.
760
System option modes can only be changed by an HP representative.
34 Planning volumes and systems
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