Answer Posted / steve holton
Add'l info to above - I was wondering where the 6n-1 stuff
came from, and found that ISPF adds 30 bytes of user
information to each entry, so the total for each entry is 42
bytes. So for an ISPF directory block (assuming you do NOT
use STATS OFF...) 6 entries will fir in each directory
block. The LAST entry in the directory is always a "dummy"
entry with member name x'FFFFFFFFFFFFFFFF', so I am assuming
that the 6n-1 is actually a calculation as to how many
members a directory of a certain size can hold. So, for
example, an ISPF (STATS ON) dataset can hold (6 x number of
directory blocks) - 1 (for the x'FF... dummy entry) members,
asuming that you don't x37 abend because "data size".
Note that the binder (linkage editor) apppears to fit 7
members per directory block (24 bytes user data = 36
bytes/entry), so for load modules (not PDSE program
objects...), the corresponding formula is 7n - 1, and for
IEBCOPY or IEBUPDTE created members with no user data (12
bytes per entry) 21n - 1.
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