Kreiter IBM-Main wrote: >I'm looking for some suggestions on how to possibly improve I/O performance to >a PDS.
You already got good suggestions including moving to PDSE and compressing of that 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. Do you need *all* those members for that single job? Grouping your members into different PDS / PDSE may help. Perhaps you should redesiging that job to read the contents sequential instead of randomly. >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. Is that volume cached? If all these members are just being read, caching may help marginally. If that volume is heavily used, consider moving your PDS to an inactive volume. Ask your storage admin about this. Groete / Greetings Elardus Engelbrecht ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
