W dniu 2016-02-18 o 10:30, Timothy Sipples pisze:
1. Memory! [...]
Just to underscore how revolutionary 4 TB of main memory is in the z13s,
the zEC12 -- the largest model mainframe introduced in 2012 -- supported
"only" 3 TB of main memory. This supposed "mid-range" z13s mainframe
supports 33% more main memory than the biggest available mainframe did
until 2015.
Well, it was a *shame* for mainframe. Both: memory limit and the price
of memory.
At the time you mention PC server vendors (including IBM system x)
offered configurations up to 12TB of memory (non-RAIM protected). 4
times more!. I haven't checked current p/Series aka System p limits, but
it was always higher than for mainframe, at least from the times of z990.
So, during the years mainframe was the platform with the *lowest* memory
limit ...and it stiil is, even z13 (without "s"). And I do not have to
update information about PC servers, because those outdated machines
had more than mainframe today.
Price is also a problem - price of GB was always the higher among the
plaftorms (some exceptions could be possible). Not to mention it can be
purchased from different vendors.
So, if your workload need big memory choose... yes, I have big problem
to justify such workload on mainframe.
--
Radoslaw Skorupka
Lodz, Poland
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