In our shop, the magic bullet is:
1) Dataclass has 1 volume, with dynamic volume count of 20.
2) Dataset is (or can be made) PSE.
As others have said, check the allocation - both in the JCL and in the SMS
data class used - if any. If the DSN is grossly underallocated in the JCL,
fix that first.
Other thoughts - have you made sure all of the volumes in your Storage
Group are enabled? Set as SMS? Are your VTOC and VTOCIX not full and
healthy? (I've been bit by that one!).
Hope this helps!
BobL
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Lizette Koehler
Sent: Tuesday, July 9, 2019 5:00 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [EXT] Re: IGD17272I but lots of space in storgrp
So the key for this message is
REQUESTED SPACE QUANTITY = nnnn {KB|MB}
What was in this message.
Typically I find this message occurs when the volumes being selected do not
have sufficient space for allocation. Also because the space parms are not
tuned to handle daily usage vs. high water mark storage allocation.
What is the SPACE= parameters being use?
How many extents is the dataset going to
What does the pool look like? Are there lots of volumes will less than
adequate storage on them?
SMS is not always going to pick the volumes we think it should. The algorithm
can go after volumes less than optimal.
There is a Share presentation from 2011 that may help
DFSMS Basics: How SMS Volume Selection Works
Page 11 in this presentation shows a great graphic of how a volume is selected.
Hope this helps
Lizette
> -----Original Message-----
> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On
> Behalf Of Elaine Beal
> Sent: Tuesday, July 09, 2019 11:37 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: IGD17272I but lots of space in storgrp
>
> We are getting this message even though there is a LOT of contiguous
> space available in the storage group.
> We get this periodically and adding a volume seems to relieve the
> immediate request.
>
> Thanks,
> Elaine
>
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