Measure Reference Manual

Legacy Style Only ID Field DDL Definitions for DISC 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 and later RVUs,
redefined. See SERVERNET.
CTRL
(Legacy Style only) In D-series RVUs, controller number of the device. In G-series RVUs, no longer
used; returns zero.
UNIT
(Legacy Style only) In D-series RVUs, unit number of the device. In G-series RVUs, no longer used;
returns zero.
Legacy Style Only Counter Field DDL Definitions for DISC Entities
These counter fields are used in Legacy Style DDL records only.
Fields are listed alphabetically; subfields are listed in the order they occur in the field.
ABLKS-INUSE-MAX
(Legacy Style only) No longer used.
ABLKS-INUSE-QTIME
(Legacy Style only) No longer used.
C
(Legacy Style only) Disk cache metrics. While the C field is included in both the Legacy Style DDL
and the ZMS Style DDL records, the subfield contents and the sequence of the subfields varies
based on the style of the record. For the subfield contents and sequence of the C field for ZMS
Style DDL records, see Common and ZMS Style Only Counter Field DDL Definitions for DISC Entities
(page 196). In the Legacy Style DDL record, this field is divided into these subfields:
Counter TypeDescriptionSubfield
IncrementingNumber of times a required block is found in cache on a
read or buffered write operation, which saves a disk I/O.
HITS
This counter includes cache hits on both read and write
operations.
IncrementingNumber of times a required block is not found in cache
on a read operation, which causes a disk I/O. Read
MISSES
operations that do not go through cache are not included
in this counter.
IncrementingNumber of times the cache tables indicate a required block
is in cache, but not because the memory manager is using
FAULTS
it for another purpose. Faults occur when a cache is too
large or physical memory is too small for a given
application. Fault rates greater than 5% of all I/O
operations generally indicate you need more memory.
IncrementingNumber of times the disk process had to write to the
audit-trail volume before it could write a dirty cache block
AUDIT-BUF-FORCES
and thereby free that block for another use. This value
should be close to zero.
202 Entities and Counters