Need to benchmark IOPS reliably

[ivog]

Hi,

Can someone recommend a linux utility to reliably benchmark IOPS on local, NFS and iSCSI volumes?

I need something that can handle large data sets (definitely over 32G, ideally even larger) and 10G ethernet bandwidth.

I've tried Bonnie++ (measures bandwidth but not IOPS), iorate (can't seem to work with datasets larger than 4G, can't seem to saturate a 1G ethernet), and fio doesn't seem to provide reliable results (I'll run the same test twice with completely different results).

Thanks for your input.

[srajarat2]

Use fio (flexible I/O) which is more meaningful and easy to use.

[gkanapathy]

iozone is pretty good, but it does take a lot of fooling around with the options, and the output does take a bit of knowledge to interpret.