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Chapter 3 Preparing for Universal Replicator z/OS Operations 3-7
Hitachi Universal Replicator for IBM /OS User’s Guide
Minimum volume capacity 1 cylinder
50 cylinders for a non-OPEN-V
volume.
48.1 MB for an OPEN-V volume.
Note: A journal volume consists of
two types of areas, one for
containing journal data, and the
other for containing information for
managing remote copy operations.
Caution: Volumes containing a VMA (volume management area) cannot be used
as journal volumes. For detailed information about a VMA, please refer to the
Data Retention Utility User's Guide.
The table below explains emulation types and the capacity of volumes that can
form pairs. For details on the maximum number of pairs, see the next section.
Table 3-3 Specifications of Volumes that can Form Pairs
Item Support specifications
Emulation type Same emulation type.
Volume capacity The same capacity.
URz can copy data between volumes with the same emulation and capacity
(e.g., 3390-3R to 3390-3R). URz also supports the Virtual LVI/LUN feature of
the USP V storage system, enabling you to establish URz pairs with custom-
size emulation types as well as standard-size emulation types. When custom-
size emulation types are assigned to URz pairs, the secondary data volume
must have the same capacity as the primary data volume. The URz remote
console software displays the emulation type of the primary data volumes and
secondary data volumes.
URz supports the Virtual LVI/LUN feature of the USP V storage system, which
allows you to configure custom-size LDEVs which are smaller than standard-
size LDEVs. When custom-size LDEVs are assigned to a URz pair, the
secondary data volume must have the same capacity as the primary data
volume.
Table 3-4 shows the emulation types and capacity of master and restore
journal volumes that can be used for a URz software.
Table 3-4 Journal Volume Specifications
Item Support specifications
Emulation type Same emulation type.
Volume capacity
Does not matter whether the capacity is the
same or different.
Table 3-5 shows the RAID level combination of data volume and journal
volume in the journal group that can be used for URz.