To complement:
Parallel Sysplex - a CF is required, which mean sysplex links (emulated,
free - for PS within single CPC). GRS is STAR mode is possible and
strongly suggested. (GRSplex is required, the mode is suggested).
Base Sysplex - CTC links required. In the old days also sysplex timer.
Now it can be sysplex link to provide time synchronization for STP
(Server Time Protocol). The GRS is mandatory and it's configuration is
RING, which is not the best from performance point of view. For base
sysplex within single CPC there are no STP-only links, but CTC over
FICON is required. Note: the FICON can be shared, that means used for
other purposes.
Monoplex. GRSplex is still possible (unless something changed) and it is
RING topology with drawbacks mentioned above. Of course multiple
monoplex LPARs may share DASD without GRSplex, but again it is not
seamless - at least PDSE sharing is almost impossible.
...and there is CA-MIM family of products. :-)
--
Radoslaw Skorupka
Lodz, Poland
W dniu 21.06.2024 o 08:41, Brian Westerman pisze:
You can just use extra FICON interfaces as FCTC's. IBM refers to that method
as a baby sysplex. It allows you to have GRS in ring mode. TO have star mode
you need CF's.
If you have multiple LPARs and you share dasd, then you need either CF's
(expensive) or Ficon CTCs (pretty cheap). The setup is very simple. CF's are
much faster but ficon CTC's easily handle 3,4 or 5 lpars without any issues at
all.
Brian
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