Hitachi MP-96RD625-01 manual Specifications of Volumes that can Form Pairs, Support specifications

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.

Chapter 3 Preparing for Universal Replicator z/OS Operations 3-7

Hitachi Universal Replicator for IBM /OS User’s Guide