I have a memory from 15-20 years ago that PDS directory search was done
connected, which meant high connect time indicated a directory search.
I don't know if this has changed since then - I would have assumed it
had, but perhaps not? In which case something that caches the directory
should help. I have a memory of a similar vintage that it could be done
with VLF, but I can't remember the details.
Sorry if this is too vague to be useful :-)
Andrew Rowley
Black Hill Software
On 28/04/2016 10:32 PM, Kreiter IBM-Main 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
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