Measure Reference Manual

Because the I/O process modifies this counter before the I/O operation, if the write fails, the byte
count might not be accurate.
In D-series and G-series RVUs, this is a 32-bit counter. In H-series and J-series RVUs, this is a 64-bit
counter.
In G-series RVUs, the OUTPUT-BYTES-F field is a 64-bit version of OUTPUT-BYTES.
Counter type: Accumulating.
READ-QTIME
Total time spent by read requests queued to this disk.
Counter type: Queue.
READ-QBUSY-TIME
Time spent in a state in which read requests of any number were queued to this disk in this processor.
Counter type: Queue Busy.
READS
Number of physical read operations (from disk to memory) performed by the disk process. In
addition to programmatic read operations, many commands (for example, LISTHEADERS and
LISTDEFECTS) also read from the disk.
Counter type: Incrementing.
REQUEST-QTIME
Time that requests spent on the disk process internal queue (includes any currently active requests).
When reading a request, the disk process places it on the internal queue. After processing the
request, the disk process removes the request from the internal queue. To determine the length of
the disk process external queue (requests waiting to be read by the disk process), measure the disk
process and examine the RECV-QTIME counter of the PROCESS entity.
Counter type: Queue.
REQUESTS
Number of I/O requests (READ, WRITE, FILEINFO) received by the disk process. The FILE entity
records most of these requests on a file-by-file basis. To determine how long the requests were
queued before being read by the disk process, measure the process and examine the RECV-QTIME
counter of the PROCESS entity. After reading a request, the disk process places it on an internal
queue. REQUEST-QTIME measures the length of the internal queue.
Counter type: Incrementing.
REQUESTS-BLOCKED
Number of times an operation had to wait because the requested file or record was already locked.
Typically, a record is locked by a LOCKFILE request, a LOCKREC request, or a TMF auditing
operation.
Counter type: Incrementing.
STARTING-FREE-BLOCKS
Number of free entries in the free space table for the volume when the measurement starts. The
free space table is an internal data structure maintained by DP2. 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.
200 Entities and Counters