Hello A general question
A non-sms dataset cannot span over volume count of more than 6 ? Cause I was able to allocate using ISPF 3.2 dataset on 11 mod27 but the job failed with the below error spanning not more than 6 volumes. I used IDCAMS repro to copy IEC032I E37-08 , IFG0554P. On Sat, 20 Dec 2025, 20:24 Radoslaw Skorupka, < [email protected]> wrote: > W dniu 20.12.2025 o 01:08, Michael Watkins pisze: > > From memory: No z/OS dataset can span more than 59 volumes. 16 extents > can reside on each volume unless the data set is SMS-managed and the > DSNTYPE is defined as 'EXTENDED', in which case up to 123 extents can > reside on each volume. However, unless Extent Constraint Removal is > specified as 'Y' in the DATACLAS, the total number of extents spanning all > volumes is 255. > > Not exactly. > Datasets are limited to 16 or 123 extents per volume. > Some datasets can be multi-volume, other datasets are single-volume > only. Maximum is 59 volumes (on DASD). > Some datasets are limited to 64k TRK per volume, other are not limited. > The limits depends on dataset organisation and type. Examples: > basic PS - 16 ext, 59 vol, 64k TRK > large PS - 16 ext, 59 vol, 16M TRK > extended format PS - 123 ext, 59 vol, no known limit for size. > PDSE - 123 ext, 1 vol, no practical limit for size. > VSAM - 123 ext, 59 vol, 4GB limit size (with exception for ZFS) > ext-fmt & ext-addr VSAM - 123 ext, 59 vol, 4G CI size (up to 128 TB), > other interesting features. > > (the above is not full list) > > SMS is pre-req for extended format, however as we can see it is not > pre-req for 123 extents. > Extent constraint removal is for VSAM only and for VSAM-specific limit > (255 ext per dataset or rather component). > > > -- > Radoslaw Skorupka > Lodz, Poland > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
