Siemens SM2 monitoring system User Manual

U3585-J-Z125-8-76

41

SM2 monitoring programs

This monitoring program provides information on the number and average duration of file
access, provided that access was by way of the I/O output system of privileged PAM
(PPAM). This includes file access using the methods EAM (Evanescent Access Method)
and ISAM (Indexed Sequential Access Method).
In addition, data is recorded for the access methods SAM (Sequential Access Method) and
UPAM (User Primary Access Method), all disk access, and all access to magnetic tape files
with standard blocks.
The FILE statistics also contain the access times for files. The monitored time covers the
logical duration of I/O operations between start and end of a job from the point of view of
the software. For asynchronous I/O operations, this time can be considerably greater than
the hardware time.

In the case of multiprocessor systems, monitoring is restricted to I/O operations originating
in the local system running SM2.

This monitoring program supplies information on the migration of files to the background
level and the retrieval of files to the processing level.

This monitoring program provides information on read and write access to global storage
(GS), categorized by partitions.

This monitoring program provides information on read and write access to volumes which
are emulated on global storage.