W dniu 2010-08-03 17:12, Ted MacNEIL pisze:
I have to disagree with you here.
You DO need to compare these features - because the vendors do things so much
differently.
You just have to have performance guarantees in the purchase agreement.
I won't use names, but we just installed an array from one of the big vendors.
We bought it with 40 GB cache, which was billed to us as usable cache.
Only after the array was installed and we started having performance problems
did
the vendor come back to us with a "well, half of your cache is being taken up
with array control information
If you have performance agreements, then the vendor does the work, not you.
...and you get what vendor wants. BTDT. The performance strongly depends
on workload type. How do you define "my workload must be performed well
and I must be happy of that"?
I saw (even did for some vendors) how much the numbers depend on type of
workload. And *I* prepared the workload for test scenarios - just to
prove assumed performance numbers. No test was defined in RFP and in
fact nothing reasonable could be defined. Last but not least: the tests
were last step of the project - a much after vendor won the competition,
delevered devices, installed them etc. etc. A lot of effort from vendor
site was done, but also from buyer side, not to mention time.
I could mention a lot of features/parameters that are very differently
implemented or even unique to some vendors ...fortunately Ron did the
job and his English is much better. <g>
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