On Wed, 23 Nov 2022 at 15:17, Tom Brennan <[email protected]> wrote:
> > but it is mere waste on DASD, as 55,996 - 32760 = 23,236 bytes left > > over, and because tracks can't be shared between other files > > Great overview, but is the note above still true with modern DS8000 > boxes? It's just hard for me to imagine 3390 emulation logic holding > that 23K hostage. > Yes and no. Doubtless at the storage box level that space is not wasted. The box will surely take advantage of what it knows about unused 3390 track space to gain efficiencies in space and time for backups, copies, compression, and so on. But z/OS knows nothing about any of that, and the space is still unusable at the architected 3390 level. So your allocation will fill up when the 3390 space, however virtual it may be in reality, is full. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
