HP XP P9500 Storage - Manual (Page 129)

1. Set up Cnt Ac-J at the primary, intermediate, and remote sites and configure ports. See:
“Configuring local and remote systems for Cnt Ac-J ” (page 45)
“Defining fibre-channel port attributes ” (page 44)
2. Configure Cnt Ac-J journals in the three sites. When you register a journal, CAJ 3DC is
automatically enabled in the Edit Journal Volumes dialog box. This setting allows registration
of two MUs in a journal, as required for the intermediate S-VOL/P-VOL. See
“Registering
journal volumes in a journal ” (page 50) for more information about registering journals.
NOTE: The Edit Journal Volumes dialog box setting, CAJ 3DC, cannot be changed in the
dialog box. To disable, it is necessary to delete the journal, disable the setting, and then
register the journal again.
3. Create the pair in the first mirror, from the primary to the intermediate site. Specify a value
from 0 to 3 as the Mirror ID.
4. When pair status becomes PAIR, create the pair in the second mirror, from the intermediate
to the remote site. Specify the secondary journal and S-VOL used in the first mirror as the
primary journal and P-VOL of the new pair.
Select a Mirror ID from 0 to 3, though not the one used for the local site pair.
Make sure pair status changes to PAIR before proceeding.
5. (Optional) Create a delta resync pair using the P-VOL in the local site mirror and the existing
S-VOL in the remote site mirror.
Select a Mirror ID from 0 to 3, though not those used in the other two mirrors in the
configuration.
6. Assign remote command devices to the following:
•
Local site’s primary-intermediate pair mirror ID
•
Local site’s delta resync pair mirror ID
•
Intermediate site’s primary-intermediate pair mirror ID
•
Intermediate site’s intermediate-remote pair mirror ID
•
Remote site’s intermediate-remote pair mirror ID
•
Remote site’s delta resync pair mirror ID
3 Cnt Ac-J DC multi-target configuration
In a multi-target configuration, data is copied from the local site to two remote sites.
The benefit of this configuration is that it provides a third copy of the data, helping to insure that
business can continue in the event of a failure at the other two sites.
You can also create a delta resync pair from one remote site S-VOL to the other remote site S-VOL.
Once created, the delta resync pair remains split unless the S-VOL is needed for disaster recovery.
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