[Iometer-user] Extrem High IOPS

[Sascha E. \(e. Mail\) <fe...@un...>]

Hello,

 

I have 16 HDDs (not SSDs!) behind a LSI RAID Controller. The disks are old
Seagate Contellation, 7200 RPM, 500 GB capacity. I configured this 16 disks
as a RAID 10 and deactivated any cache of the controller (in any case: the
controller has only 512 MB of cache). My host has 16 GB RAM, my virtual disk
has about 7 TB capacity. My OS is Windows 2008 R2 SP1.

 

I started measuring the disk using IOMeter 1.1RC, also tried 2008-06-22-rc2.
I am using the disk without filesystem to generate random reads with 4 K
blocksize. I am using one worker with one outstanding IO. As sector size I
tried 0, 500000000, 5000000000 and 10000000000.

 

My Problem is, that I get about 8000 IOPS with this workload. The average
response time is 0,1225 ms. I do not believe that this is possible using
normal disks. Using more outstanding IOs I can also get 17000 IOPS.

 

Can anybody give me a hint, what is going wrong? Perhaps I should offer this
high-performance disk array at ebay. J

 

Bests

 

Sascha