DS1NOBDB DS XL1 NUMBER OF BYTES USED IN LAST * DIRECTORY BLOCK (PDS ONLY)
Learned something old today, thanks! Not sure how bad I needed to know that, but it makes me curious as to what that field is actually used for (other than to provide a way to break PDSes). sas On Fri, Jun 22, 2018 at 4:07 AM, Greg Price <greg.pr...@optusnet.com.au> wrote: > On 2018-06-22 7:53 AM, Jesse 1 Robinson wrote: > >> I have a dim memory of learning ages ago that a PDS with 1 directory >> block is somehow 'different', that certain updates to it require fiddling >> with the VTOC in addition to changing data on a track. Sound familiar? >> > > Once the last directory block has started to be used, its unused capacity > is maintained in the data set VTOC entry. If there is only one directory > block then then it is also the last directory block and so any member > addition or deletion will also require a VTOC entry update. > > Cheers, > Greg ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
