Hi Brian.

Are you referring to Coupling Facility Thin Interrupts? It sounds like you
might be.

Also, are you running a dedicated ICF engine? Or sharing?

Thanks, Martin

Sent from my iPad

> On 29 Jan 2019, at 06:24, Brian Westerman <[email protected]>
wrote:
>
> Hi,
>
> Has anyone had any experience with using the internal coupling channels
on a z13.  "supposedly" IBM has removed the active wait problems (where the
CF lpar would try to use 100% of whatever it gets from PR/SM), but I was
wondering if it's ready for prime time yet.  I have a z13s (single CPU)
with 3 LPARs on it, they are fairly low use, but I think it'a about time
the started to use GRS since they share DASD (it was small, but now more
and more as time goes on).  They have been lucky so far, but I would rather
not rely on luck.  They don't have the cash to add a specialty processor,
and if IBM has really reduced the overhead of ICF, then it might be a good
fit for them.
>
> Anyone using the microcode ICF on a z13 or z14?  If so, does it play well
with everyone else?
>
> Brian
>
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