3 cnt ac-j z dc multi-target configuration – HP XP P9500 Storage User Manual
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Setting up the 3 Cnt Ac-J Z DC cascade configuration
Set up a 3 Cnt Ac-J Z DC cascade configuration using the following procedure. To set up a 3DC
cascade using Cnt Ac-J Z and Continuous Access Synchronous Z, see
.
1.
Set up Cnt Ac-J Z at the primary, intermediate, and remote sites and configure ports. See:
“Configuring local and remote systems for Cnt Ac-J Z ” (page 60)
“Defining fibre-channel port attributes ” (page 59)
2.
Configure Cnt Ac-J Z journals in the three sites. When you register a journal, CAJ Z 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
journal volumes in a journal ” (page 65)
for more information about registering journals.
NOTE:
The Edit Journal Volumes dialog box setting, CAJ Z 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 Duplex, 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 Duplex before proceeding.
3 Cnt Ac-J Z 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.
Mirror IDs are assigned to each pair. You assign arbitrary numbers as mirror IDs. For example:
•
Remote site1 mirror ID: M
•
Remote site2 mirror ID: N
The host issues an update to the production volume and, as with a standalone Cnt Ac-J Z system,
the update data is asynchronously written from the primary volume (P-VOL) to the remote S-VOLs.
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