W dniu 2011-04-25 09:44, ibmnew pisze:
Hi all
"Volume count" unconditionally puts that number of entries in the catalog for
a new data
set. Dynamic volume count only puts in the volumes that actually get
extended to and have data on them. This cuts down on the space taken up
in the catalog.
Q1 Could I use Dynamic volume count(DVC) replace the volume count parameter?
In most cases YES.
Q2 Is there any other advantage for DVC?
IMHO the most important advantage of DVC is dynamic character - you can
change already existing datasets by changing DATACLASS they have
assigned. No need to ALTER existing datasets file by file. "Regular"
volume count in dataclass is taken only during creation of new dataset.
Q3 Is there any disadvantage for DVC?
Yes, TIOT size. First idea is to assign DVC to every PS dataset and set
number of volumes to 59. Why not?
However you can reach "JCL limit for number of datasets in single step".
For TIOT set to default 32k it is apporx. 1635 datasets.
A lot, but every volume is counted! So if you use DVC 59, then your
limit is 1635/59 = 27 datasets only!
Solution:
1. Increase TIOT size to maximum, which is 64k
2. Reduce number of volumes in DVC
3. Use DVC only where really needed.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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