Measure Reference Manual

STORAGE-POOL
Name of the SMF storage pool to which the measured disk is assigned (process name of the storage
pool process).
Common and ZMS Style Only Counter Field DDL Definitions for DISKFILE Entities
These counter fields are used in both styles of DDL records. Fields that are used in ZMS Style DDL
records only are noted.
Fields are listed alphabetically.
BLOCK-SPLITS
Number of block splits during writes to the file.
Counter type: Incrementing.
CACHE-READ-HITS
Number of times a read operation found the required block in cache, which saves a disk I/O. The
DRIVER-INPUT-CALLS counter counts all read operations, both cache hits and misses.
Counter type: Incrementing.
CACHE-WRITE-CLEANS
Number of times a write operation found the required block clean in cache, which saves a read
operation to bring the block into cache.
Counter type: Incrementing.
CACHE-WRITE-HITS
Number of times a write operation found the required block in cache and saved a read I/O (to
bring the block into cache). A write I/O can also be saved if the file has the buffered option set
to ON. (That is, if multiple writes can occur to a dirty block before it is physically written.)
Counter type: Incrementing.
DBIO-INPUT-CALLS
Number of direct bulk I/O read operations to a requesting processor. This counter is a subset of
DRIVER-INPUT-CALLS.
Counter type: Incrementing.
DBIO-OUTPUT-CALLS
Number of direct bulk I/O write operations from a requesting processor. This counter is a subset
of DRIVER-OUTPUT-CALLS.
Counter type: Incrementing.
DRIVER-INPUT-CALLS
Number of read operations, including cache hits. The CACHE-READ-HITS counter counts cache
hits on read operations.
Counter type: Incrementing.
DRIVER-OUTPUT-CALLS
Number of write operations, including cache hits. The CACHE-WRITE-HITS counter counts cache
hits on write operations.
Counter type: Incrementing.
222 Entities and Counters