In <[email protected]>, on
12/14/2013
at 07:30 PM, DASDBILL2 <[email protected]> said:
>The SMF EXCP counting code counts all EXCPs but not necessarily
>all I/O requests. If your wayward job is using the STARTIO
>"access method" or the Media Manager to do its output I/O to tape,
Isn't MM strictly DASD?
>BSAM, QSAM, BPAM, and BDAM all use EXCP
BPAM, BSAM and QSAM for DASD have used EXCPVR since SAM-E.
>so all their I/Os are counted by SMF.
Non sequitor. Even before SAM-E there was chained scheduling; the
access methods update the SMF data to reflect multiple blocks written
under a single EXCP[VR].
>I don't know about VSAM.
The same as with BPAM, BSAM and QSAM; the access method is responsible
for updating the counts. For VSAM, of course, there are no EXCPs, just
I/O through the MM.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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