HP StorageWorks XP Remote Web Console Software User Manual

Page 32

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Figure 6 Selecting and Settling the Journal at the Secondary Storage System

The secondary storage system settles and restores the journal data to the secondary data volume
as follows:

Journal data stored in the cache

The journal data is copied to the corresponding cached track and promoted to formal data.

Journal data stored in the restore journal volume

The journal data is read from the restore journal volume to cache. The journal data that is
read to cache is copied to the existing cache track and promoted to formal data. After that,
the space for the restore journal volume is released.

Universal Replicator for Mainframe Delta Resync Operation

When you are using Universal Replicator for Mainframe and TrueCopy for Mainframe Synchronous
in a 3DC multi-target configuration, Universal Replicator for Mainframe provides the delta resync
operation as one of the solutions for failures in the primary site. In a 3DC multi-target configuration,
there are three sites: one primary and two secondary. These constitute the TrueCopy for Mainframe
Synchronous and Universal Replicator for Mainframe secondary sites. For detailed information
about the 3DC multi-target configuration, see

“TrueCopy for Mainframe Synchronous (3DC

Multi-target Configuration)” (page 83)

.

If a failure occurs on the primary site in 3DC multi-target configuration, use Business Continuity
Manager to reorder the TrueCopy for Mainframe Synchronous secondary site as the primary site.
If you perform a delta resync operation after the TrueCopy for Mainframe Synchronous secondary
site becomes a primary site, the Universal Replicator for Mainframe pair will be restored quickly.
You will not need to wait for a long time before you can use the Universal Replicator for Mainframe
data volumes again.

The delta resync operation consists of the following two processes:

Preparation before the failure occurs (see

“Journal Obtain in TrueCopy for Mainframe

Synchronous Secondary Site” (page 33)

),

Recovery after the failure (see

“Switching the Master Journal Group of Universal Replicator

for Mainframe” (page 34)

).

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About Universal Replicator for Mainframe Operations

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