> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of John Eells
>
> > What is the maximum number of cyclinders that can be used to define a dsn
> > that is not VSAM EXTENDED.
> I think it is 4400 cylinders. I was trying to allocate a dsn at 4500 4500
> but I kept on abending with
> IGD17273I ALLOCATION HAS FAILED FOR ALL VOLUMES........
> >
> > Finally I was able to allocate the dsn at CYL(4350 4350).
>
> z/OS DFSMS Using Data Sets documents maximum data set sizes, including limits
> for both extended format
> and nonextended format VSAM data sets, in Topic 1.3.2.3. It says that
> nonextended VSAM data sets have
> a limit of 4GB*.
>
> (4GB* / 56664 / 15) = 5,053 cylinders (approximately)
>
> [ snip ]
>
> * I believe that is most likely GiB for the pedantic among us.
IIRC, DASD capacities are expressed in decimal, rather than binary, quantities:
4KB = 4,000 bytes;
4MB = 4,000,000 bytes;
4GB = 4,000,000,000 bytes;
Etc.
-jc-
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