Measure Reference Manual

This counter is updated only for the primary path record. The primary path can be obtained from
the LIST DISC command (Measure H03 and later PVUs) or the SCF INFO DISCNAME, DETAIL
command.
Counter type: Snapshot.
STARTING-FREE-SPACE
Number of bytes free on the volume when the measurement starts. This counter is displayed by
MEASCOM when the REPORT STYLE is ZMS. It can be used in the IF and BY clauses as well as
with the PLOT commands.
This counter is updated only for the primary path record. The primary path can be obtained from
the LIST DISC command (Measure H03 and later PVUs) or the SCF INFO DISCNAME, DETAIL
command.
Counter type: Snapshot.
SWAPS
Number of swap operations (both into and out of memory) performed for the memory manager.
Unlike CPU swaps, which are not dependent on file block size, the disk process performs I/O
based on the block size of the file and might need to perform more than one I/O to swap the
needed data. The DISC SWAPS counter is advanced for each I/O. Therefore, total disk swaps
might be greater than total CPU swaps. Only updated pages are swapped. Because code pages
are never updated, they are never swapped out of memory.
Counter type: Incrementing.
VOLSEM-QTIME
Time that the requests spent waiting for the volume semaphore (exclusive and shared modes).
With REPORT RATE OFF, the value of this counter equals the total queue time for volume semaphore.
With REPORT RATE ON, the value of this counter equals the average number of requests in the
queue.
Under normal conditions, the value of this counter should be close to zero. Otherwise, it indicates
some operations are holding the volume semaphore in exclusive mode, causing all other request
operations that require the volume semaphore in share mode to wait.
Counter type: Queue.
WRITE-QBUSY-TIME
Time spent in a state in which write requests of any number were queued to this disk in this processor
Counter type: Queue Busy.
WRITE-QTIME
Total time spent by write requests queued to this disk.
Counter type: Queue.
WRITES
Number of physical write operations (from memory to disk) performed by the disk process. In
addition to programmatic write operations, many commands (for example, FORMAT and
LOADMICROCODE) also write to the disk.
Counter type: Incrementing.
DISC 201