Another question: how to recognize processor failure?
Let's say a CPU returns false results like 2x2=5. How to recognize the
result is false?
I heard there are always two CPUs with hardware comparator. When the
bits on output are the same it is OK, othwerwise the pair is marked as
failing.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2018-12-16 o 09:39, Parwez Hamid pisze:
If I have understood your Q correctly, depending on your Z system 'model',
apart from a few older 'BC' systems, all Z Systems have dedicated 'spare'
PU/PUs (processing units). If any CP, IFL, ICF, zIIP or SAP fails, 'sparing'
action will take place transparently and in your example the 'SPARE' PU will
characterized as a CP. How quickly does this happen? You won't even notice it.
There is a lot more to this. If for some reason there aren't any 'SPARE PUs'
left, then one of the uncharactized PUs i.e. not purchase by the customer will
be used by the 'sparing' action. In case of multiple 'PU' failures (CP, ICF,
zIIP etc) , there is a pecking order as to which one will be 'recovered' first.
This is documented in the Redbooks I co-authored. Sparing is transparent to the
operating system and applications.
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