> The question is why, when I declare my dataset DISP=OLD, do I get this
> behaviour, where when I open volume sequence number 2 I look at the DEB
> and the associated UCBs and they are indeed on the volume that I know to
> be the second one, whereas when I do the same with DISP=NEW the extents
> in the DEB are all on the first volume.
Are you specifying vol-count on your allocation?
What does your allocation look like?
> Date: Mon, 4 Feb 2008 15:30:23 +0000
> From: [EMAIL PROTECTED]
> Subject: Re: Trouble opening specific volumes with OPEN TYPE=J
> To: [email protected]
>
> I'm trying to read a dataset that will potentially have many volumes
> each of which has up to 16 extents. I'm trying to open the dataset in a
> way that I get one volume at a time, with the DEB reflecting the extents
> of that volume.
>
> What you're talking about sounds like BDAM where you get a single
> logical view of a multivolume dataset?
>
> I'm wanting to do EXCP access and my understanding is that when you do
> this you get a "simple" DCB which is "connected" to one volume at a time
> and for which the DEB just reflects however many extents are on that
> volume. Certainly this is what I see, and this is how I'm performing my I/O.
>
> The question is why, when I declare my dataset DISP=OLD, do I get this
> behaviour, where when I open volume sequence number 2 I look at the DEB
> and the associated UCBs and they are indeed on the volume that I know to
> be the second one, whereas when I do the same with DISP=NEW the extents
> in the DEB are all on the first volume.
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