Prerequisite Information For 2Dc Configuration; Specifications And Restrictions For Continuous Access Journal Pair Operations - HP StorageWorks P9000 - Disk Arrays User Manual

Prerequisite information for 2DC configuration

P9500 must be installed at the local, Continuous Access Synchronous intermediate, and
Continuous Access Journal remote sites.
RAID Manager is recommended at all sites. If the intermediate site is not connected to a host,
a remote command device is required. See HP StorageWorks P9000 RAID Manager User
Guide for more information.
Remote Web Console is required at all sites.
The primary site requires the following:
Host application
◦
◦ Continuous Access Synchronous
Continuous Access Synchronous P-VOL, the primary production volume.
◦
The intermediate site requires the following:
Continuous Access Synchronous
◦
◦ Continuous Access Journal
Continuous Access Synchronous S-VOL = Continuous Access Journal P-VOL
◦
Continuous Access Journal master journal volume
◦
◦ Use the journal that was registered when 2DC Cascade was set to Enable in the Edit
Journal Volume dialog box. With it you specify whether to write Continuous Access
Synchronous P-VOL data to a shared Continuous Access Synchronous S-VOL/Continuous
Access Journal P-VOL, or to write only to the Continuous Access Journal master journal.
OFF — Data will be written to the shared Continuous Access Synchronous
S-VOL/Continuous Access Journal P-VOL on the intermediate site. The default is OFF.
ON — Data will be written only to Continuous Access Journal master journal volume on
the intermediate site.
The remote site requires the following:
◦ Continuous Access Journal
Continuous Access Journal S-VOL
◦
◦ Continuous Access Journal remote journal volume

Specifications and restrictions for Continuous Access Journal pair operations

The Continuous Access Journal pair depends on the Continuous Access Synchronous pair for
data. Data copying is not executed when the Continuous Access Journal pair is created, but
when the Continuous Access Synchronous pair is created.
About resynchronizing a Continuous Access Journal pair:
◦ The Continuous Access Synchronous S-VOL must be in PSUS or PSUE status (Error Level
field = Group).
Make sure the Continuous Access Journal S-VOL is not in SSWS status when
◦
resynchronizing with -swaps or -swapp options.
◦ If the Continuous Access Journal pair is suspended and in SSWS status, execute the
Pairsplit RB command on the Continuous Access Journal S-VOL, confirm that status
becomes PSUS, then resynchronize the pair from the primary site.
If a Continuous Access Journal pair is suspended when the Continuous Access Synchronous
S-VOL is in PAIR or COPY status, the Continuous Access Synchronous pair becomes suspended
by error.
A Continuous Access Journal pair cannot be released if cascaded with a Continuous Access
Synchronous pair. To release a Continuous Access Journal pair, release the Continuous Access
Synchronous pair, and then release the Continuous Access Journal pair.
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