The whole disk is NOT in your virtual storage; The track window IS (IIRC).
Cheers, Martin Sent from my iPad > On 19 May 2016, at 21:45, Tony Harminc <[email protected]> wrote: > >> On 19 May 2016 at 01:44, Martin Packer <[email protected]> wrote: >> It's sort of come back to me: >> >> A small track size limits the virtual storage window (probably usually >> below the line in 1989 when I looked at this). Or it might've been >> cylinder. But I think it was track. >> >> I'm wondering if anyone else remembers something like this. > > I'm not sure I get the "virtual storage window" idea. VIO emulates an > entire disk drive in virtual storage. So where is there a window? The > whole disk has to be in virtual storage at once. Well, I suppose there > could be logic to not allocate Virtual until used, but that would > surely better be left to VSM's and RSM's expertise at managaing their > respective kinds of storage. > > Now maybe VIO was changed much later (surely there wasn't expanded > storage in 1989...?) to use or perhaps favour expanded storage, in > which case a window model could make some sense. But only if VIO was > directly dealing with expanded storage rather than just requesting > that RSM use it to back virtual storage used to hold the VIO disk > data. > > Tony H. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN >Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
