W dniu 03.06.2020 o 15:05, Allan Staller pisze:
<quote> You cannot share chpid without the switch. It is point to point topology, not
daisy chains like in Bus&Tag. </quote>
That is incorrect. I routine share channels across LPARs.
The purpose of the switch is to connect multiple physical CECs to a single
device.
Yes, it is incorrect. Linguistically incorrect.
And I sustain what I said (or wanted to say) using my poor English, so
let me rephrase it:
FICON chpid can be share between LPARs. Or even spanned - that mean
share betwenn LPARs belonging to different CSSes.
FICON can be used to attach multiple CUs, like two DASD boxes, or DASD
and tape (not recommended, but possible). In order to do that you have
to use switch.
And the above is the only method to have CTC on FICON chpid, which is
also used for other CU connectivity (like DASD or tape).
Your purpose of the switch is also valid, however in this scenario the
CU may have more channel adapters and each CPC may use point-to-point
connectivity directly to a CU. It is especially reasonable when given CU
has more than 8 channel adapters, i.e. 16. In that scenario CPC A may
use 8 channels (max. limit), and CPC B may use other 8 channels.
Back to the topic it is impossible to share FC chpid for CU connectivity
and CTC *without the switch*.
--
Radoslaw Skorupka
Lodz, Poland
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