It is not recommended that changes be made to any of the default values. However, the following illustrate some circumstances under which you may wish to change them.
If the backup consistently takes longer than 300 seconds (5 minutes), and the TSS9123A message is always seen, the fourth parameter can be increased. A value of 1800 would allow 450 seconds (7.5 minutes) (after the first 16 seconds) for the backup:
TIMELOCK(25,64,128,1800)
If the Security File is shared among several systems, but the total amount of I/O from all of the systems is well under the capacity of the device, significant time may be lost to lock contention due to the quarter second delay any time the attempt to get the lock fails. In this case, reducing the first parameter will have little effect on the average response time for a security request but may reduce the peak response time considerably. If the first parameter is reduced, the second, third, and fourth should be increased so that the time intervals before issuing the messages remains constant. For example:
TIMELOCK(10,160,320,3000)
The two previous examples can be combined as follows:
TIMELOCK(10,160,320,4500)
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