Have you bought the storage yet? If so, what are the physical disks?
Because 7,000 IO ops/sec w/ a 20 ms response time is not an easy goal easy to meet.
And how is that 20 ms defined? Average response time or max response time?
---------- Post updated at 03:33 PM ---------- Previous update was at 03:24 PM ----------
Quote:
Originally Posted by
jim mcnamara
...
I suspect you do not have a problem - check first. I also hope you did not order the NAS hardware - sounds like it was thrown at you.
Except that there are so many ways for someone not familiar with doing high-performance IO to ruin performance.
Such as "Let's set up a 27-disk RAID-6 array with a 1 MB block size per disk! Because bigger is faster!"
Then the array gets partitioned out into 34 different LUNs, so that every server in the data center has its IO contending with every other server in the data center over the same physical disks. And then wonder why the critical app they're running - that does IO via 17 layers of C++ iostreams and winds up doing 4 kb random writes all over the place because some developer whose only tool is to write more and more code reinvented the concept of a "database" but has no clue how to do it competently - is slow.
(And 4 years later only one server is left using a single LUN on that array because everyone bailed on it because performance stunk on the expensive hardware that was supposed to fix all their storage issues, but no one can figure out a good way to migrate that last server off it - and hey, it seems to be working just fine now...)