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st33000650ss
2009 Dec 04
2
measuring iops on linux - numbers make sense?
...and collectd
"merged operations per second") is a not so bad way to get IOPS.
A partner of ours doubts that this is possible with the current
hardware - a 3ware 9690SA-4I4E
(http://www.3ware.com/products/sas-9690SA.asp) with 512Mb battery
backed up cache and 8 SAS 15k rpm disks (SEAGATE ST3300656SS) in RAID
1+0. They calculate 750 IOPS per spindle and say that the maximum they
ever saw from any 15k disk was 350 iops on RAID 0.
Am I measuring the numbers correctly? Is there a better way to measure
IOPS on CentOS?
The OS is CentOS 5.3 x86_64, the rest of the hardware is 64Gb RAM, 2
quad-core...