I have very little experience with SANs, so please excuse this newbie.
One of our production sites has an HP EVA8000 SAN with a bunch of disks (forget exactly how much). it has been configured into a bunch of raid5's and the SQL server uses one RAID volume for data and another for the Log.
So far so good. Or so I thought
Today i ran some speed tests. Using rdfc i created a 100 MB file on the main data disk while the system was heavily used. This showed between 5 and 20 MB/s throughput for write, which, i thought was a bit on the low side. I then took down the application for maintenance, and ran the test again. This time on a quiet system I got 50MB/s write performance.
Is that not a bit on the low side? I mean, I get the same from the SATA drive in my desktop.
I then tried writing 500MB to one drive (the data drive), while writing 500MB to another drive (the log drive). Those two writes interferred with each other. Is that a sign of something wrongly setup?
I don't know what I had expected, but I'm currently reviewing the system to try and locate bottlenecks.
So, i guess my question would be. What kind of performance would you expect (read/write) from a (probably) expensive SAN using Fiber connectors?
(No, its not the little netgear thingy; its this) http://h10010.www1.hp.com/wwpc/ca/en/sm/WF05a/12135568-12135820-12135820-12208992-12208992-12236532.html