HP XP7 Owner's Manual page 31

Table 1 1 System option modes (continued)
Mode Category
495 NAS
506 Continuous Access
Journal, Continuous
Access Journal Z
530 Continuous Access
Journal Z
Description
Note:
1. Make sure to apply mode 491 when the performance of
Business Copy/ Business Copy Z/ ShadowImage FCv1 is
considered to be important.
2. Make sure not to apply the mode when the host I/O
performance is considered to be important.
3. The mode will be noneffective if 3 or more pairs of DKAs are
not mounted.
4. Make sure to set mode 467 to OFF when using mode 491,
since the performance may not improve.
5. The mode is noneffective for the NSC model.
Function:
That the secondary volume where S-VOL Disable is set means the
NAS file system information is imported in the secondary volume.
If the user has to take a step to release the S-VOL Disable attribute
in order to perform the restore operation, it is against the policy
for the guard purpose and the guard logic to have the user
uninvolved. In this case, in the NAS environment, Mode 495 can
be used to enable the restore operation.
Mode 495 = ON:
The restore operation ?Reverse Copy, Quick Restore) is allowed
on the secondary volume where S-VOL Disable is set.
Mode 495 = OFF (default):
The restore operation ?Reverse Copy, Quick Restore) is not
allowed on the secondary volume where S-VOL Disable is set.
This option is used to enable Delta Resync with no host update
I/O by copying only differential JNL instead of copying all data.
The HUR Differential Resync configuration is required.
Mode 506 = ON:
Without update I/O: Delta Resync is enabled.
With update I/O: Delta Resync is enabled.
Mode 506 = OFF (default):
Without update I/O: Total data copy of Delta Resync is
performed.
With update I/O: Delta Resync is enabled.
Note:
Even when mode 506 is set to ON, the Delta Resync may fail
and only the total data copy of the Delta Resync function is
allowed if the necessary journal data does not exist on the primary
subsystem used for the Delta Resync operation.
When aContinuous Access Journal Z pair is in the Duplex state,
this option switches the display of Consistency Time (C/T) between
the values at JNL restore completion and at JNL copy completion.
Mode 530 = ON:
- C/T displays the value of when JNL copy is completed.
Mode 530 = OFF (default):
C/T displays the value of when JNL restore is completed.
Note:
At the time of Purge suspend or RCU failure suspend, the C/T of
Continuous Access Journal Z displayed by Business Continuity
System option modes, host modes, and host mode options
Default MCU/RCU
OFF
OFF MCU/RCU
OFF RCU
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