Measure Reference Manual

Legacy Style Only Counter Field DDL Definitions for DEVICE Entities
These counter fields are used in Legacy Style DDL records only.
Fields are listed alphabetically.
INPUT-BYTES-F
(G-series Legacy Style only) Same as INPUT-BYTES but accommodates larger values (64 bits rather
than 32).
Counter type: Accumulating.
OUTPUT-BYTES-F
(G-series Legacy Style only) Same as OUTPUT-BYTES but accommodates larger values (64 bits
rather than 32).
Counter type: Accumulating.
READ-BUSY-TIME
(Legacy Style only) In D-series RVUs, the time spent reading from the device. In G-series and later
RVUs, no longer used; returns zero.
Counter type: Busy.
READ-QLEN-MAX
(Legacy Style only) Maximum number of read requests queued to this device at any time since the
counter record was allocated.
Counter type: Max queue.
WRITE-BUSY-TIME
(Legacy Style only) In D-series RVUs, the time spent writing to the device. In G-series RVUs, no
longer used; returns zero.
Counter type: Busy.
WRITE-QLEN-MAX
(Legacy Style only) Maximum number of write requests queued to this device at any time since the
counter record was allocated.
Counter type: Max queue.
Usage Notes for All DEVICE Entities
• The DEVICE counters track all device activity. Device activity includes both I/O from user and
system processes. It also includes internal activities such as writing to the free space table and
writing file and volume labels. To compare and balance the workload of two or more devices,
use the DEVICE counters.
• SUBSYSTEM-VERSION for ZMSDEV records is provided by the device I/O process; for example,
the tape process (OTPPROCP).
• DEVICE reports include fields that are calculated from DEVICE counters. These fields are not
defined in the DEVICE DDL record:
DEVICE-AST
(ZMS Style only) The average time that each request spends waiting or being processed
by DP2. DEVICE-QBUSY-TIME is divided by the sum of READS and WRITES.
Counter type: Service time.
DEVICE 187