Do you mean 2105 or ESS Shark?
None of them introduced 1024 devs per box.
The relief was intruduced "architecturally" with the ESCON and
implemented in earlier DASD boxes like Ramac RVA (can't remember model,
it was higher than T82), Tetragon 2100 aka HDS Freedom 7700E and others.
The trick was usage of CUADD - something similar to LPAR from host side.
ESCON CU supported up to 16 CUADD => 16x256 devices => 4096 devices per
box (some workarounds were possible -- single DASD box can be defined as
more than one CU).
FICON extended it to 256 CUADD => 256x256 => 64k devices which is the
limit for HCD ...unless you define 3390Aliases in SS1 (or SS2...).
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2015-12-04 o 15:14, Ed Finnell pisze:
It was the jump from 256 to 1024 and four digit UCB's among other niceties.
In a message dated 12/4/2015 8:01:16 A.M. Central Standard Time,
[email protected] writes:
I know that thing by the name of ESS or Shark, but never realised it is
2105...
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