W dniu 2012-02-07 20:24, Hunkeler Peter (KIUP 4) pisze:
[...]
The "C" in CKD stands for "count" and this is some information about the
amount of data following in the next data block (the amount may vary
from block to block). Likewise "K" in CKD stands for "key" and some
access methods are using key data that is stored before the actual data.
So, both are bits of information that are used and thus cannot be
dropped.
Well... The only supported things that still use K from CKD are:
1. PDS (not PDSE) directory blocks. As documentation says PDS dir block
is 256 bytes long, but there is also 8-byte KEY.
2. VTOC. AFAIR 44-byte KEY is part of 140-byte VTOC record.
AND NOTHING ELSE!
So there are very few access method functions which really use KEY of CKD.
Of course the KEY is not the only reason for compatibility between
emulated 3390's and plain old SLEDs.
--
Radoslaw Skorupka
Lodz, Poland
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