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DC Dynamic Volume Count support

 
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Willem Vermeer

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Joined: 31 Oct 2007
Posts: 38
Location: Amsterdam, the Netherlands

PostPosted: Wed May 25, 2011 8:41 pm    Post subject: DC Dynamic Volume Count support
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Greetings.

The DFP Storage Admin manual tells us that Dynamic Volume Count is NOT supported for a.o.:

[1] data sets accessed by VSAM RLS
[2] any system ds with ACBSDS=ON
[3] VSAM EOV Snapshot processing

Now, does this mean that assigning a DC with a DVC > 1 will result in an allocationabend or will the DVC simply be ignored?

Btw, what exactly is this "ACBSDS=ON" and what is "VSAM EOV Snapshot processing"? I know VSAM EOV and I know Snapshot, but "EOV Snapshot"?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8057
Location: East Dubuque, Illinois, USA

PostPosted: Wed May 25, 2011 9:08 pm    Post subject:
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From IBM'S II13718:
Quote:
VSAM End-Of-Volume (EOV) support of DVC depends not only on
whether the data set is a VSAM data set, but also on the type of
VSAM access to the VSAM data set.

For VSAM access to a VSAM data set, VSAM EOV will use DVC when
extending a component to a new volume, subject to the
restrictions listed below.

VSAM End-Of-Volume restrictions for using Dynamic Volume Count:

VSAM EOV will NOT use DVC if any of the following are true:

1. The VSAM data set is not on System Managed (No Storage class)
2. The VSAM data set does not have a data class.
3. The VSAM data set is a system data set such as:
* Catalog BCS - can reside on only one volume
* VVDS - can reside on only one volume
* System data set (ACBSDS=ON)
* Page data sets
* Swap data sets
4. The VSAM data set was created with the IMBED option
5. The VSAM data set was created with the KEYRANGE option
6. The VSAM data set was created as a temporary data set
7. The VSAM data set is being accessed with Record Level Sharing
(RLS)
8. Snapshot processing.

ACBSDS is one of the bits of the ACB and indicates that this is a system data set.
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