<quote>
STP (or earlier sysplex timer) is mandatory for sysplex, even for basic sysplex.
For production parallel sysplex it is good idea to have standalone CF.
</quote>

Not if entire sysplex is in one box. If that is the case, SYSPLEX time is not 
needed.
As long as all participants use the same time source, all will be well.

The issue requiring an ETR is synchronization/tolerization for XCF.




-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of R.S.
Sent: Monday, July 9, 2018 5:47 AM
To: [email protected]
Subject: Re: Sysplex between two hardware

W dniu 2018-07-06 o 18:22, Jesse 1 Robinson pisze:
> We all have lots of questions about your goals here, but the short answer to 
> your question is Yes, sysplex is the answer. I assume that your two boxes are 
> already connected in some way as to share access to data. Turning such a 
> configuration into a sysplex may require some additional hardware, but not a 
> lot.
>
> -- If you want a full-function parallel sysplex, you would need to create an 
> internal coupling facility LPAR (ICF) in each CEC.
>
> -- You would need CF links to connect each ICF to the opposite CEC.
>
> -- I think you would also need server timing protocol (STP) to keep clocks in 
> synch; I have not tried running without STP.

STP (or earlier sysplex timer) is mandatory for sysplex, even for basic sysplex.
For production parallel sysplex it is good idea to have standalone CF.

--
Radoslaw Skorupka
Lodz, Poland




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