Should say " SMF30BLK and SMF30TEP do not change if IOSRVC is set to TIME."
> -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Ron Hawkins > Sent: Thursday, August 13, 2009 3:12 PM > To: [email protected] > Subject: Re: [IBM-MAIN] Degraded I/O performance in 1.10? > > 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 ---------------------------------------------------------------------- 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
