Measure Reference Manual

READS
Number of read operations (from device to memory) performed by the I/O process. In addition
to programmatic read operations, internal operations (such as retries on I/O operations) also
modify this counter. A read operation to a key-sequenced file can result in multiple reads because
the index blocks must be read before the data blocks.
Counter type: Incrementing.
REQUESTS
Number of requests received by the I/O process. To determine how long requests were queued
before being read by the I/O process, measure the I/O process and examine the PROCESS
RECV-QTIME counter.
Counter type: Incrementing.
WRITE-QBUSY-TIME
Time spent in a state in which write requests of any number were queued to this device in this
processor.
Counter type: Queue Busy.
WRITE-QTIME
Total time spent by write requests queued to this device.
Counter type: Queue.
WRITES
Number of write operations (from memory to device) performed by the device process. In addition
to programmatic write operations, internal operations (such as writing volume labels) also modify
this counter. A write operation to a key-sequenced file can result in multiple writes because of block
splits or updates to the index blocks.
Counter type: Incrementing.
Legacy Style Only ID Field DDL Definitions for DEVICE Entities
These ID fields are used in Legacy Style DDL records only.
Fields are listed alphabetically.
CHANNEL
(Legacy Style only) In D-series RVUs, channel number of the device. In G-series RVUs, redefined.
See SERVERNET.
CTRL
(Legacy Style only) In D-series RVUs, controller number of the measured device. In G-series RVUs,
no longer used; returns zero.
UNIT
(Legacy Style only) In D-series RVUs, unit number of the measured device. In G-series and later
RVUs, no longer used; returns zero.
186 Entities and Counters