At one time there was a component called Actual Block Processor that was used both by VSAM and paging, and the paging data sets were CI format. I have no idea how much of that, if any, remains in z/OS, but essentially my question was whether pages were now stored in 4 KiB physical records.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי ________________________________________ From: IBM Mainframe Assembler List <[email protected]> on behalf of Bob Raicer <[email protected]> Sent: Monday, November 13, 2023 2:14 PM To: [email protected] Subject: Re: Is True Skip-Sequential Processing Possible with RECFM=FB,DSORG=PS? A PDSE is essentially a form of VSAM Linear, where the physical data set is a collection of 4K-byte blocks. It does not have the notion of CA's and CI's like other VSAM data sets. The notion of BLKSIZE is synthesized and mapped onto the internal PDSE structures; the BLKSIZE value is not the physical unit of transfer size as is the typical case for a traditional Physical Sequential data set. Here is a URL for a SHARE presentation that provides a nice explanation of how a PDSE is put together: https://share.confex.com/share/124/webprogram/Handout/Session16956/PDSE%20Nuts%20and%20Bolts.pdf Bob On 2023-11-13 7:48 AM, Seymour J Metz wrote: > > Does anybody know whether CI size = block size for PDSE and zFS (linear) data > sets? VSAM used to use multiple blocks for a CI. > > >
