Yes, but the underlying hardware does not support a hypervisor the way
zSeries does. The caches will thrash more readily on the Intel (They are
small) the internal bandwidth is less on intel so the penalty for thrashing
is higher, and zSeries has the SIE hardare mechanism which provides for
faster switching of vritual machines and preemptive exits. You can right
code to do anything. zSeries is not good at SPECinteger: the cache is
too big, so the clock rate is low and it dedicates space to RAS, SIE, as
well that could be dedicated to processor speed. However, SPECint will run
on zLinux. If your objective is single cpu oriented program done for 1
user as fast and inexpensively as possible, Intel machines have the
advantage. If you want to run a large workload with lots of threads at the
highest performance p595 is the top dog. If you want to run a mixed
workload efficiently, sharing data among a large number of users zSeries
wins.
Joe Temple
Executive Architect
Sr. Certified IT Specialist
[EMAIL PROTECTED]
845-435-6301 295/6301 cell 914-706-5211
Home office 845-338-1448 Home 845-338-8794
Doug Fairobent
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Re: Why Zseries
02/10/2005 02:27
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Linux on 390 Port
Doesn't VMware on Intel provide the same advantage as z/VM when compared to
discrete servers? In the case where there is no z/OS system (so that data
sharing and communicating with z/OS are moot) why use z/VM instead of
VMware?
- doug
Joseph Temple
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02/10/2005 02:10
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<[EMAIL PROTECTED]
IST.EDU>
Let me add to what Joe added.
When you combine the low utilization that many (not all) dense rack
mounted servers run at it becomes even easier for z to win the
througput/KVA race. Even if we don't include non production servers and
look at clusters for a single application, the peak composite utilization
of distributed solutions is very often under 25%. Adding non production
servers, mixing applications and doing workload management with VM can
increase utilization leverage on relative capacity well above the 4 to 1
indicated by the production data.
Joe Temple
Executive Architect
Sr. Certified IT Specialist
[EMAIL PROTECTED]
845-435-6301 295/6301 cell 914-706-5211
Home office 845-338-1448 Home 845-338-8794
Joe Poole
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Re: Why Zseries
02/10/2005 01:46
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On Thursday 10 February 2005 01:32 pm, Levy, Alan wrote:
> David - thanks. This is what that I was looking for.
>
Let me add to what Dr. David said with a few metrics. The densely
packed servers of today draw between .1 and .7 kVA of power. If you
take .3 kVA as an average, it takes only 15 servers to match the 4.5
kVA of a z900. Add more CPUs and internal disk to the servers, and
it's not uncommon to find a single server rack that exceeds the power
requirements of the zSeries with a Shark thrown in for good measure.
I've heard that it's become difficult to add the required power to some
of the buildings in NYC to support the server induced power load.
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