A few years ago, IBM took a Power system and a z/Architecture
system and configured them as closely as they could.
As I recall, they both had the same amount of C-Store available
to the operating system, and they both had the same number of
channels (8 if I remember correctly), and they ran to
equivalently sized RAID boxes.
And, if I remember correctly, they were using programs written in
C, that were ported from the one to the other.
The object was to check out how efficiently I/O was prosecuted
(done).
The z/Architecture machine finished long before the power system.
I thought I had a copy of that comparison, but I just can't find
it so I can give a link to it.
Regards,
Steve Thompson
On 03/21/2016 09:40 AM, David Crayford wrote:
On 21/03/2016 9:14 PM, R.S. wrote:
Well,
I observed 1,3M IOPS on EC12 or z196 machine during WAS
installation. With minimal CPU utilisation (I mean regular CPU,
I haven't checked SAP).
IMNSHO a PC server with collection of new shining Emulex cards
has waaaay worse I/O capabilities.
We did some tests of database operations on PC. Effects are
unequivocal.
I admire you honesty :) What class of PC server? Was it connected
to a SAN and did it offload I/O to a peripheral device?
BTW: Typical z/OS I/O workload is very different from PC
workload. Much less IOPS, much more data, much less CPU%.
My wife used to work for HDS and I had some interesting
conversations with some of the engineers she used to work with.
That was a few years ago but in their opinion the
high end *nix servers could match a mainframe for I/O throughput.
PC commodity hardware is different but racked up with enterprise
kit I would be interested to know how
they would shape in a drag race. How would a Dell blade with
Infiniband, SAN and enterprise class HBAs compare?
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