HP Integrity NonStop J-Series - Manual (Page 128)

Guardian Performance Analyzer (GPA) User Guide
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Glossary
#OUT
The GPA output file.
blocked request
A request that cannot be processed because another application has blocked access to a
record or file.
cache
A portion of memory used to store frequently-accessed information in order to save the
time otherwise required for disk I/O operations.
cache call
A request for disk data expected to be found in cache.
cache fault
An event that occurs when a disk process expects to find a data block in cache and
discovers that the memory manager has removed it.
cache hit
A successful retrieval of data from cache.
disk queue time
Average amount of time spent waiting for a disk process to service a request.
disk volume queuing
A buildup of disk I/O requests waiting to be completed.
dispatch
An event representing the allocation of CPU cycles to a process.
dynamic process control block
A Process Control Block (PCB) used for a process whose execution life is shorter than the
measurement period analyzed by GPA.