HP XP7 Storage - Manual (Page 135)

◦ Cnt Ac-J master journal volume
◦ Use the journal that was registered when 2DC Cascade was set to Enable in the Edit
Journal Volumes dialog box. With it you specify whether to write Cnt Ac-S P-VOL data
to a shared Cnt Ac-S S-VOL/Cnt Ac-J P-VOL, or to write only to the Cnt Ac-J master journal.
Enable — Data will be written only to the Cnt Ac-J master journal volume on the
intermediate site for use in the 2DC configuration.
Disable — Data will be written to the shared Cnt Ac-S S-VOL/Cnt Ac-J P-VOL on the
intermediate site.
◦ Updates to the Cnt Ac-S S-VOL/Cnt Ac-J P-VOL is prohibited.
◦ System option mode 707 must be set to ON. This allows Cnt Ac-S P-VOL data to be
written directly to the Cnt Ac-J master journal and not to the shared Cnt Ac-S S-VOL/Cnt
Ac-J P-VOL.
- Though it is possible to change option mode 707, the change is not reflected in the
system. You need to delete the journal then re-register it with the option mode set to ON.
- Remote Web Console does not show system option 707. Therefore, it is recommended
that all journals in the system have the same system option mode 707 setting.
•
The remote site requires the following:
Cnt Ac-J ◦
◦ Cnt Ac-J S-VOL
◦ Cnt Ac-J remote journal volume
Specifications and restrictions for Cnt Ac-J pair operations
•
Because the Cnt Ac-J pair depends on the Cnt Ac-S pair for data, data copying is not executed
when the Cnt Ac-J pair is created, but when the Cnt Ac-S pair is created.
•
About resynchronizing a Cnt Ac-J pair:
The Cnt Ac-S S-VOL must be in PSUS or PSUE status (Error Level field = Group). ◦
◦ Make sure the Cnt Ac-J S-VOL is not in SSWS status when resynchronizing with -swaps
or -swapp options.
◦ If the Cnt Ac-J pair is suspended and in SSWS status, execute the Pairsplit RB command
on the Cnt Ac-J S-VOL, confirm that status becomes PSUS, then re-synchronize the pair
from the local site.
•
If a Cnt Ac-J pair is suspended when the Cnt Ac-S S-VOL is in PAIR or COPY status, the Cnt
Ac-S pair becomes suspended by error.
•
A Cnt Ac-J pair cannot be released if cascaded with a Cnt Ac-S pair. To release a Cnt Ac-J
pair, first release the Cnt Ac-S pair, then release the Cnt Ac-J pair.
Specifications and restrictions for Cnt Ac-S pair operations
•
Specify a volume for the Cnt Ac-S P-VOL that is not used in a Cnt Ac-J pair In the 2DC
configuration, use the journal that was registered when 2DC Cascade was enabled.
•
The Cnt Ac-J P-VOL that is specified for the Cnt Ac-S S-VOL must be in PAIR status. The only
available differential management unit is tracks.
•
To re-synchronize the Cnt Ac-S pair, the Cnt Ac-J P-VOL must be in PAIR status.
•
You cannot use the takeover command on the Cnt Ac-S S-VOL when suspending the Cnt Ac-S
pair.
2 data center configuration 135