On Thu, Apr 28, 2016 at 7:32 AM, Kreiter IBM-Main < [email protected]> wrote:
> 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 > > This is probably a stupid idea. I get the impression that you can't change the program. So my logic is this: IEBCOPY is very fast in copying a PDS. Memory is faster than DASD thought: use IEBCOPY to make a temporary DSN copy of the parmlib on VIO (in-memory buffering) before the step doing the high I/O to the parmlib and use this temporary DSN instead. This assumes that your VIO set up is large enough to accommodate the DSN. -- The unfacts, did we have them, are too imprecisely few to warrant our certitude. Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
