>
> Another point to note is that ABR sets the high-order bit on
> in the DSCB CCHHR field of the catalog entry when the data
> set is archived and the original volume serial is retained.
>
No quite correct. ABR records in the field DSCBTTR a pointer
to the entry in ABR's Archive Control File. This helps to avoid
lengthy searches thru the ACF.
> I do not know if this bit setting occurs or not when the
> volume serial of MIGRAT is used.
The entry is used to support ABR's Auto-Recall via the
ABR Locate Exit. ABR requires the use of the volser MIGRAT
when migrating datasets off SMS Managed volumes.
>
> I believe that the usual restriction of "VTOCs must be in the
> first 64K cylinders of a volume" must therefore become "VTOCs
> must be in the first 32K cylinders of a volume" when ABR
> (without MIGRAT at least) is used to archive data sets.
>
> I would guess that all volumes had less than one thousand
> cylinders when this logic was devised.
>
No such restriction exists!!!
Stephen Mednick
Computer Supervisory Services
Sydney, Australia
Asia/Pacific representatives for
Innovation Data Processing, Inc.
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