-- snip --
Background: when you define i.e. DASD unit in HCD you can have multiple
logical control units (CUADD) as well as many LPARs can use the chpids
attached to the CU. However logical paths limit (# of logical paths =
#CUADDs x #LPARs) vary depending on DASD model.
For example HDS 7700E aka Tetragon 2100, escon-attached, have 16 logical
paths per chpid.
ESS Shark has 64 paths.
-- snip --
64 Paths are for ESCON attached channels.
-- snip --
Questions:
1. Where can I find such numbers ? Usually technical specifications does
not cover this parameter or it is "well hidden".
-- snip --
You need to know the 'special handshake', then you may get some information
from your CE. :-)
For the IBM CU, take a look at the redbook
IBM System storage DS8000 Series : Architecture and implementation
SG24-6786-
Comparisson values for ESS are also included.
-- snip --
2. What is the limit for ESS Shark *ficon-attached* ? --> 256
3. What is the limit for HDS 9960 (escon and ficon) ? --> ?
4. What is the limit for EMC DMX-3 ? Is it 128 ? --> ?
5. Why the limit vary depneding on device model ? --> ?
6. Are there any "upper limits" for ESCON or FICON ? --> ?
-- snip--
John
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