Measure Linux IOPS for a running system

Solution 1:

Uhm... iostat on my system shows the IOPS:

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               1.00        64.00         0.00         64          0

Might want to look at upgrading.

Solution 2:

Install sysstat package if you don't have it already and then use command sar -d 1. Watch the tps column. It gives you at least the ballpark figure.

But remember that actual maximum number of IOPS varies heavily depending on your server workload. A server with lots of sequential access might get more IOPS than a one doing lots of random access.

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Solution 3:

Look at nmon as an option for a nicer presentation of the same data.

http://nmon.sourceforge.net/pmwiki.php