Bruce Black wrote:
The size of a data set is limited to 65,535 tracks per volume except
for
the following types of data sets:
- Hierarchical File System (HFS)
- Extended format sequential
- Partitioned data set extended (PDSE)
- VSAM - Large format
-----
There is also LBI (Large Block Interface), and if this bit is turned
on
(in the Format 1 DSCB?), then it may also exceed the 65,535 (64K)
Track
limitation.
You copied it slightly wrong. the last line should be
- VSAM
- Large Format
the last one is the key. In z/OS 1.7, they introduced Large Format
sequential datasets, which work even on non-SMS volumes. You request
with DSNTYPE=LARGE in JCL or the data class. In this format, a normal
sequential dataset can exceed 65,535 tracks on a volume, up to the
volume size. Some things, like NOTE and POINT are affected but most
programs don't use them.
I imagine that this is what you meant by LBI, which is actually
something quite different (large blocks on TAPE, nothing to do with
disk).
In fact, my first guess was 64k track limit, but 4000 CYL is 60000
tracks. That's less than 64k.
--
Radoslaw Skorupka
Lodz, Poland
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