Ted, You are talking about the IOSRVC statement in the IPS which is used to calculate IO Service Units. It doesn't change the EXCP count, it changes whether EXCP count or IO connect time are used as the basis for IO Service Units. SMF30BLK and SMF30TEP if IOSRVC is set to TIME.
I have to admit to not having looked at Type 30 records closely for a very, very long time. I noticed that there is an SMF30AIS field that is described as the SSCH count for the Address that was introduced in OS/390 2.4. That may be a good starting place to look for differences. The MXG variable is also called SMF30AIS. I'm not sure where you get 8.3ms of connect time for one EXCP. That's about 3MB in an EXCP on FE4, and pretty close to a half track block with BUFNO=5 on ESCON. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Ted MacNEIL > Sent: Thursday, August 13, 2009 1:37 PM > To: [email protected] > Subject: Re: [IBM-MAIN] Degraded I/O performance in 1.10? > > >For BSAM and QSAM looking at the EXCP will not tell you if buffering has > changed because it is the count of blocks processed. Set BUFNO to 1 or 8 and > you will still get the same EXCP count. > > I can't remember when exactly. > But, you have been able to change EXCP to service rather than blocks for a > long time. > So, each 'EXCP' becomes 8.3 ms of connect time, under that option. > I can't remember the exact option (or even release of the OS), but it's been > around for a long time. > > In that case, 1, or 8, BUFNO makes a difference. > - > Too busy driving to stop for gas! > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
