The BLKSIZE shown is not the physical block size. It is the __emulated__ blocksize which your normal BPAM program would use. I am fairly sure that the actual PDSE is physically blocked at 4K pages on the device itself. Like zFS, HFS, and some other things, PDSE seems to have been influenced by LINEAR VSAM in its choice to do physical DASD in 4K pages.
-- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:ibm-m...@bama.ua.edu] On Behalf Of Eric Bielefeld > Sent: Thursday, February 11, 2010 11:21 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: PDS vs. PDSE > > I was just thinking - I wonder if the blocksize I used is bad > for PDS/E, givin the 4096 page six. Will it write blocks at > 7520, or just write 4K blocks? Should I make the blocksize > something with a closer multiple of 4096? > > Eric > > -- > Eric Bielefeld > Systems Programmer > IBM MVS Technical Services > Dubuque, Iowa > 563-845-4363 > > ---- Wayne Driscoll <wdri...@us.ibm.com> wrote: > > Eric, > > This is probably due to the fact that PDS/E's require a > minimum of 1 page > > per member (Point 14 in Radalsow's summary). Since these > are JCL members, > > I would imagine that a fair number of them are 15-20 line > members, with > > the 4K minimum member size,for an FB-80 dataset that works > out to just > > over 51 records, so any JCL that is under 51 lines will > still take up 4K > > each, while in a PDS an 80 byte member takes 80 bytes in > the PDS itself > > (after the directory of course). > > > > =============================================== > > Wayne Driscoll > > OMEGAMON DB2 L3 Support/Development > > wdrisco(AT)us.ibm.com > > =============================================== > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
