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Chapter 3 Preparing for Universal Replicator z/OS Operations 3-5
Hitachi Universal Replicator for IBM /OS User’s Guide
Duplicate VOLSER (Volume Serial Number)
When you select Entire as the initial copy option, the URz initial copy
operation copies the VOLSER of the primary data volume to the secondary
data volume, and therefore the primary data volume and secondary data
volume of the URz pair will have the same VOLSER. Since the host operating
system does not allow duplicate VOLSERs, the host system administrator must
take precautions to prevent system problems related to duplicate VOLSERs.
For example, the URz secondary data volumes must be defined in the system
generation so they do not come online automatically (see WARNING below).
WARNING: If the volumes which will become URz secondary data volumes are
physically attached to the same system images as the production volumes
which will become the URz primary data volumes, the following problems can
occur:
When a URz pair is released, the old secondary data volume is usually offline.
When a host system is IPL’d (initial program loaded), the operator will be
offered both volumes and asked which volume should be left offline – the old
duplicate volser message. This can be confusing and is prone to error. To
avoid duplication of VOLSER,
1. Identify the volumes that will not be accessed by the host system.
2. Perform CHP OFF or some other operation to ensure that the volumes are
inaccessible.
3. When performing IPL, you must perform LOAD CLEAR.
Volume Types
The following DKC and DKU emulation types can be used for the URz software.
Table 3-1 Supported Emulation Types
Emulation Support type
DKC All CU images that can be used with USP V
DKU (Drive) All mainframe volumes that can be used with USP V
All DKC and DKU (drive) emulation types for USP V can be used for URz
software. In URz, the emulation types of primary and secondary data volumes
are indicated.
The following CU emulation types can be used for MCUs (primary storage
systems) and RCUs (secondary storage systems): 3990-3, 3990-6, 3990-6E,
2105, 2107, A-65A2, H-65A2, A-65C1, A-65C2.
The CU emulation type of an MCU can be different from the CU emulation type
of the corresponding RCU.