You might consider testing with PDSE. In z/OS 2.1 there were a number of performance improvements made to PDSE processing including improved directory processing. If you do a google search, you'll find a number of Share presentations on the PDSE improvements.
Have a nice day, Dave Betten z/OS Performance Specialist Cloud and Systems Performance IBM Corporation email: [email protected] IBM Mainframe Discussion List <[email protected]> wrote on 04/28/2016 08:32:56 AM: > From: Kreiter IBM-Main <[email protected]> > To: [email protected] > Date: 04/28/2016 08:33 AM > Subject: PDS I/O Performance Improvement > Sent by: IBM Mainframe Discussion List <[email protected]> > > Hello, > > I'm looking for some suggestions on how to possibly improve I/O > performance to a PDS. A user is running a job that is reading a > large parmlib (through PROJCL I believe). I think the access is > random rather than sequential. The parmlib has ~180,000 members is > has an LRECL of 80/BLKSIZE of 27,920. The performance team has > reviewed a found ~ 6ms response time to the volume that houses the > PDS with most of the time being connect time. > > Thanks, > Chuck > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
