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
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
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?
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; }')
dm-* so i asked, i need to perform addition on those partitions
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.