W dniu 2016-11-15 o 16:22, Paul Gilmartin pisze:
On 2016-11-15, at 04:17, R.S. wrote:
What's the maximum number of cylinders that can be allocated to a PDSE?
The number might be enormous nowadays.
AFAIK there is no practical limit. So the limit is volume size minus VTOC&Co.
That means 1TB nowadays.
BTW: PDSE V1 has "not so big" limit for the member size. I experienced the
limit when some huge PTF was to big to fit in PDSE, but still within PDS limits. Note:
old PDS limited to 64k tracks, but no limit for member size.
My understanding is that the TTRZ that NOTE returns for a PDS limits the
data set and therefore any member to 2^16 tracks. PDSE counts records in
24 bits, so for a sufficiently large LRECL, about 300 bytes, PDSE can
hold a larger member than PDS.
I don't intend to try the experiment.
SG24-6106 says:
Maximum architected size PDSE: 16 TB, PDS - no such limit
Maximum size of member PDSE: 15 728 69 records, PDS - no such limit
Maximum # of members PDSE: 522 236, PDS - no such limit
Maximum number of tracks per volume PDSE - unlimited, PDS - 64k
So, for PDS maximum size of member is 64k tracks minus some space for
directory.
For PDSE V1 maximum size of member depend on record size, for LRECL=80
it is 1 258 291 120 B, approx. 1,2 GB
Note, PDSE V2 has substatially larger limit: 2 146 435 071 records, so
for LRECL=80 it means ~171 GB
BTW: Gil, you mentioned 2^16 tracks as the limit for PDS member. AFAIK
it's very close to 64k tracks... ;-)
Regards
--
Radoslaw Skorupka
Lodz, Poland
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