Comparison to the number of CPs is quite obvious, but
1.) Number of SAPs is related to the number of BOOKs/drawers, not to the
number of active CPs.
2.) Why we compare number of SAPs to the number of CPs at all???
Shouldn't we compare number of SAP to the I/O configuration?
(backgound note: I don't have any problem with number of SAPs. Just curious)
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2016-04-07 o 17:51, Jon Butler pisze:
If we compare the maxed out base and high end models of the z10, z12, and z13
we do see a trend, but it’s a downward ratio…fewer SAPs per CP. Of course you
can vary the ratio to suit your business, but consider the following.
If my arithmetic is correct, the z10 base had a 4:1 CP to SAP ratio, while the
z13 has a 5:1 CP to SAP ratio.
The max configurations for the z10 works out to a 1.34 CPs per SAP, while the
z13 is 3.125 CPs per SAP.
The z10/E12 has 12 CPs with 3 standard SAPs, a 4:1 ratio. You can characterize
up to 3 of the CPs as SAPs, which would leave you with 9 CPs and 6 SAPs. A
1.5 : 1 ratio.
A fully loaded E64 had 64 & 11, a 5.81 : 1 ratio. You could characterize 21
additional SAPs leaving you 43 & 32, a 1.34375 : 1 ratio.
The z12/H20 has 20 CPs with 4 standard SAPs, a 5:1 ratio. You can characterize
up to 4 additional SAPs, which would leave you with 16 CPs and 8 SAPs, a 2 : 1
ratio.
A fully loaded HA1 had 101 & 16, a 6.31 : 1 ratio. You could characterize 16
additional SAPs, leaving you with 85 & 32, a 2.625 ratio.
The z13/N30 has 30 CPs with 6 SAPs, a 5:1 ratio. You can characterize up to 4
additional SAPs, which leaves you with 26 CPs and 10 SAPs, a 2.6 : 1 ratio.
A fully loaded NE1 can have 141 CPs with 24 standard SAPs, a 5.875 : 1 ratio. You can add 16 SAPs, leaving you 125 CPs and 40 SAPs, a 3.125 : 1 ratio.
One thing to keep in mind is that with sub-capacity models, the SAPs still run
at full speed, so you can really get a bang for your SAP buck.
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