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Rajkumar S
Asked: 2011-08-02 23:12:53 +0800 CST

Measure Linux IOPS for a running system

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How do I measure IOPS of a running Linux server? I know that the theoretical IOPS of a SATA drive is around 90 and enterprise 10k SAS/FC disk is 180. I want to know how much my running system is using currently?

Currently I am using iotop and iostat. But both utilities do not give the IOPS number.

btw, this question is not a duplicate of this. I am not looking for benchmarking my storage system, but figure out how much IOPS is being used by my current system.

performance linux storage performance-monitoring

3 Answers

  1. Best Answer

    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.

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

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

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