An overflow storage group is used when there is not enough available space 
for the initial allocation. I believe it doesn't come into the picture when 
extending data sets. 

Volumes residing in overflow storage groups are preferred over quiesced 
volumes and storage groups.

Look at DFSMS Storage Administrator Reference (SC26-7402) for a description 
of allocation (Conventional Volume Selection chapter).

Also look at the SHARE website for a presentation on volume selection (3043 - 
How SMS Volume Selection Works)

John

>In our general SMS storage group we have several volumes in disabled new
>status that the operators can change to quiesced new status if
>necessary.  What I want to do is set up a pool of volumes that will only
>be used if absolutely no other volumes have the necessary space.
>
>Would an overflow storage group with quiesced volumes be the answer?
>
>What would be the difference between that just a quiesced storage group?
>

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