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Chapter 2. Host Software Component Functions 57
1st ed., 6/30/04 - 312579601
Swapping Library Transports - New Model Types
When you physically upgrade or change tape transports, a mismatch can occur between
the model types stored in the CDS and the updated model types specified in the UNITDEF
command. If this situation arises, you receive an error message:
SLS1628I UNITDEF: Record 1 ...MODEL is incompatible with UNIT
Follow this procedure to avoid the problem:
1. Terminate the HSC on all hosts by issuing the MVS STOP command.
2. Physically replace the tape transports.
3. Run the SET SLIDRIVS utility to omit the device numbers being replaced. It is only
necessary to specify the device numbers being replaced, not all device numbers on
the panel. Example:
SET SLIDRIVS(,,,,,,2307,2308,2309,230A),FORLSMID(0000),FORPANEL(01)
4. Run SET SLIDRIVS again to add the device numbers back in. This action clears the
model type in the CDS and allows the UNITDEF command to load at HSC startup.
Example:
SET SLIDRIVS(2301,2302,2303,2304,2305,2306,2307,2308,2309,230A),+
FORLSMID(0000),FORPANEL(01)
5. Update the UNITATTR statements to reflect the new model type.
6. Start the HSC on one host by executing the HSC start procedure.
7. When the HSC reaches the full service level, start the HSC on all remaining hosts.