HP StorageWorks XP Remote Web Console Software - Manual (Page 20)

The Number of Journal Volumes
One journal group can contain up to 64 journal volumes. Each of the journal volumes can have
different volume sizes and different RAID configurations. Journal data will be stored sequentially
and separately into each journal volume in the same journal group.
Specifications of Journal Volumes
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Types of LUs.
DKU emulation types that are allowed for journal volumes are shown in “Emulation Types for
Journal Volumes” (page 20) .
Table 2 Emulation Types for Journal Volumes
Supported Emulation Types Emulation Category
DKU (drive)
◦ OPEN-V
◦ All mainframe volumes that can be used with the XP disk array
NOTE: Status of mainframe volumes cannot be referenced.
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Volumes and their capacity.
You can use VLL volumes for journal volumes.
Journal volumes in the same journal group can be of different capacity. A master journal
volume and the corresponding restore journal volume can be of different capacity.
A journal volume consists of two areas: one area is used for storing journal data, and the
other area is used for storing metadata for remote copy.
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RAID configuration.
Journal volumes support all RAID configurations that are supported by the XP disk array.
Journal volumes also support all physical volumes that are supported by the XP disk array.
Restrictions on Journal Volumes
•
Registering journal volumes.
IMPORTANT: You must register journal volumes in a journal group before you create a data
volume pair for the first time in the journal group.
You can add journal volumes under any of the following conditions:
◦ When the journal group does not contain data volumes (that is, before you create a data
volume pair for the first time in the journal group or after all data volume pairs are
released).
◦ When all data volume pairs in the journal group are suspended.
◦ When processing for changing the status of a data volume pair (for example, release or
suspension of a data volume pair) is not in progress.
◦ When no Cache Residency Manager settings are set on the volumes.
NOTE: If a path is defined from a host to a volume, you cannot register the volume as a
journal volume.
You can use Remote Web Console computers to register journal volumes.
If you add a journal volume when a remote copy operation is in progress (that is, when at
least one data volume pair exists for data copying), the metadata area of the journal volume
(see the next section) will be unused and only the journal data area will be used. To make the
20 About Universal Replicator for Mainframe Operations