At 16:13 -0400 on 07/17/2012, Bill Ashton wrote about How does
multi-volume second extents work:
I thought I knew this off the top of my head, but someone gave me a problem
that doesn't fit what I thought.
Let's say I hvae a PS file allocated as CYL(2500,500), and it is allocated
to VOLSR1 and VOLSR2. Can someone point me to the doc that explains this,
or can someone explain to me what happens when I need to take secondary
extents?
For instance, I thought this would be the case:
1. Allocate first extent (2500) on VOLSR1
2. 2nd extent (2500) on VOLSR2
3. 3rd (500) on VOLSR1
4 - ## (500) on VOLSR1 until 16 extents or the VOLSR1 has < 500C available
in 5 pieces, then continue on with VOLSR2.
## (500) on VOLSR2 until 16 extents or B37 abend if < 500C available.
I haven't done a lot with multi-volume files, so I might have this wrong,
and would welcome your straightening me out. Thanks!
--
Thank you and best regards,
*Billy Ashton*
I do not think it rolls over to VOLSR2 until VOLSR1 fills up. I am
basing this on the layout of the Format1 and 3 DASD Labels which I do
not think can handle extents flipping back and forth between volumes.
VSAM is different since it can have extents order spread between
volumes.
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