Hi to every,
NO!
A VSAM with CIsize of 4096 can use only 12 block on every tracks
so in a cyls is possible to write 4096*12*15 => 737.280 byte or 720KB
4GB are 4294967296 byte / 737280 are about 5825 cyls (or 87381 tracks)
Remember the space limit of 65536 track on every volume for any dsn not
in extended format. (about 4369 cyls)
I hope this clarify some requirement of VSAM on dasd
Best Regards
Roberto
Il 22/10/2014 14:40, Chase, John ha scritto:
-----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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