HP XP P9500 Storage - Manual (Page 152)

•
The primary site requires the following:
Host application ◦
◦ Cnt Ac-S
◦ Cnt Ac-S P-VOL, the primary production volume.
•
The intermediate site requires the following:
Cnt Ac-S ◦
◦ Cnt Ac-J
◦ Cnt Ac-S S-VOL = Cnt Ac-J P-VOL
◦ Cnt Ac-J master journal volume
◦ Use a 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 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 Continuous Access Journal 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 primary site.
152 Configurations with Continuous Access Synchronous