Air Cleaner User Manual

2. If the number specified is greater than the current specification, the
maximum number of tape units allowable for reading archive logs
increases.
3. If the number specified is less than the current specification, tape units
that are not being used are immediately deallocated to adjust to the
new value. Active, or premounted, tape units remain allocated.
4. A tape unit is a candidate for deallocation because of a lowered value
only if there is no activity for the unit.
DEALLCT
Specifies the length of time that an allocated archive read tape unit is
allowed to remain unused before it is deallocated. This overrides the value
for DEALLCT set by CSQ6LOGP in the archive system parameters.
This, together with the MAXRTU parameter, allows MQSeries to optimize
archive log reading from tape devices.
The possible values are:
minutes
Specifies the maximum time in minutes, between zero and 1439.
Zero means that a tape unit will be deallocated immediately.
NOLIMIT or 1440
Indicates that the tape unit will never be deallocated.
DEFAULT
Resets the MAXRTU and DEALLCT parameters to the values specified in
the archive system parameters set by CSQ6LOGP.
Usage notes
Notes:
1. You are recommended to specify the maximum possible values, within system
constraints, for both options to achieve the optimum performance for reading
archive tapes.
2. When you are asked to mount an archive tape and you reply “CANCEL”, the
MAXRTU value is reset to the current number of tape units.
For example, if the current value is 10, but you reply “CANCEL” to the request
for the seventh tape unit, the value is reset to six.
SET LOG
Chapter 2. The MQSeries commands 253
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