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.
