Here is a quick primer and script to determine the iops on a disk. You can use the iostat utility but you have to first determine the name of the volume. I use df -h
iostat -d -x /dev/sda | awk 'NR==4{print "IOPS: " $4}'
For Ubuntu, you might have to install sysstat first:
apt install sysstat
For OpenSUSE, do this:
zypper in sysstat iotop