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320 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Unselect Utility
The UNSElect utility allows you to ‘‘unselect’’ a volume that the HSC leaves in a selected
state. Usually, this is an error. The ‘‘unselect’’ operation is performed without cycling the
HSC.
Note: Use this utility only if you are certain that the HSC has incorrectly left the volume
selected. Incorrect use of this utility can result in HSC abends and errant volumes.
Issue a Display Volume DEtail command to determine which host has the volume in
question. Then, issue Display DRives and Display Requests commands on the host that
has the volume in question to see if that volume is being used.
If the selected volume is mounted on a transport, issue a DISMount command for the
transport. If there is a request active to the LMU for the volume, wait for the request to
complete. If the overdue response handler indicates the request has timed out, you may
want to abort the request.
Note: For detailed information about the Display and DISMount commands, refer to
‘‘DISPLAY Command’’ and ‘‘DISMOUNT Command’’ in the HSC Operator’s Guide.
The HSC must be running on the same host that is running the UNSElect utility. If the
selected volume is selected by another active (not marked inactive in the CDS) host, the
HSC on that host must be running. Both hosts must be connected to the same LMU. In an
environment with multiple ACSs, this can be any LMU, as long as it is the same LMU.
If the FORCE option is specified, the volume is ‘‘unselected’’ regardless of the other host
being active. Using this option can result in a greater likelihood of abends if the host is
running.
If the host running UNSElect cannot communicate because both hosts are not connected to
the same LMU, rerun UNSElect on the host with the volume selected. Do not use the
FORCE parameter in this case.
Access to the UNSElect utility can be restricted by the SCP AUTHorize command. The
UNSElect utility must be invoked when the SLUADMIN program is executed by an
authorized Job Reader; that is, one STARTed with the program AUTHRDR. The load
module invoked by UNSElect is SLUNSEL.
Syntax
UNSElect VOLser(volser)
,FORCE
Unselect