Linux – Measure Linux IOPS for a running system

linuxperformanceperformance-monitoringstorage

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.

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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Linux – Trouble interpreting iostat’s tps measure

That's a single iostat invocation, which does not provide meaningful data for "per second" values, only counters are useful - it can not calculate change per second from a single value, it needs to know two values and time between them. To see real values, try something like :

iostat -d 1 2

The second output will be real values.

From the iostat manpage:

The first report generated by the iostat command provides statistics concerning the time since the system was booted. Each subsequent report covers the time since the previous report.

Linux – iotop for Linux kernel 2.6.18

Perhaps blktrace package is available for CentOS 5.5? The btrace command gives you very detailed view to I/O subsystem.

Best Answer

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Linux – iotop for Linux kernel 2.6.18

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