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How do I get read and write IOPS separately in Linux, using command line or in a programmatic way? I have installed sysstat package.

Please tell me how do I calculate these separately using sysstat package commands.

Or, is it possible to calculate them using file system?

ex: /proc or /sys or /dev

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iostat is part of the sysstat package, which is able to show overall iops if desired, or show them separated by reads/writes.

Run iostat with the -d flag to only show the device information page, and -x for detailed information (separate read/write stats). You can specify the device you want information for by simply adding it afterwards on the command line.

Try running iostat -dx and looking at the summary to get a feel for the output. You can also use iostat -dx 1 to show a continuously refreshing output, which is useful for troubleshooting or live monitoring,

Using awk, field 4 will give you reads/second, while field 5 will give you writes/second.

Reads/second only:

iostat -dx <your disk name> | grep <your disk name> | awk '{ print $4; }'

Writes/sec only:

iostat -dx <your disk name> | grep <your disk name> | awk '{ print $5; }'

Reads/sec and writes/sec separated with a slash:

iostat -dx <your disk name> | grep <your disk name> | awk '{ print $4"/"$5; }'

Overall IOPS (what most people talk about):

iostat -d <your disk name> | grep <your disk name> | awk '{ print $2; }'

For example, running the last command with my main drive, /dev/sda, looks like this:

dan@daneel ~ $ iostat -dx sda | grep sda | awk '{ print $4"/"$5; }' 15.59/2.70

Note that you do not need to be root to run this either, making it useful for non-privileged users.

TL;DR: If you're just interested in sda, the following command will give you overall IOPS for sda:

iostat -d sda | grep sda | awk '{ print $2; }'

If you want to add up the IOPS across all devices, you can use awk again:

iostat -d | tail -n +4 | head -n -1 | awk '{s+=$2} END {print s}'

This produces output like so:

dan@daneel ~ $ iostat -d | tail -n +4 | head -n -1 | awk '{s+=$2} END {print s}' 18.88

  • Thanks Mr.Dannel its useful. if i want to get full system Read/Write IOPS How to get ? – shas Aug 24 '15 at 11:00
  • when i run iostat -dx 1 i got ans like this Linux 2.6.35.14-106.fc14.i686 (shashi) 08/24/2015 _i686_ (2 CPU) Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 2.46 13.80 2.27 2.03 136.26 123.91 60.53 0.11 25.77 4.43 1.91 dm-0 0.00 0.00 2.35 0.77 93.07 6.11 31.86 0.17 53.73 2.59 0.81 dm-1 0.00 0.00 1.02 2.83 8.14 22.66 8.00 0.83 214.34 0.60 0.23 dm-2 0.00 0.00 1.37 11.89 34.77 95.14 9.80 1.67 126.06 0.84 1.11 for dm-0,dm-1,dm-2 recursively should i add? – shas Aug 24 '15 at 11:02
  • I've updated the answer with an overall template and an example for sda. If you simply want to see the IOPS for your hard drive, then use that last command for overall IOPS (iostat -d sda | grep sda | awk '{ print $2; }') – Daneel Aug 24 '15 at 11:08
  • No i want separately as u mention in 1st answer. bit confuse with dm-* so i asked, i need to perform addition on those partitions – shas Aug 24 '15 at 11:13
  • Ahh, ok. You can use the following command to check what each dm-x device is: lvdisplay|awk '/LV Name/{n=$3} /Block device/{d=$3; sub(".*:","dm-",d); print d,n;}' - I will update the answer with this, as well as how to add the results. – Daneel Aug 24 '15 at 11:14

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