Hello!
You can see the number of the IOPs in the web management of the storage. Also you can check the links there.
If you need to check the accessibility of the LUNs and shares from the script to do some automation then you can ping interfaces of the storage to check its connectivity and copy some files there (from the script with copy command (or maybe robocopy). In the first part (pings) you will check that your storage can be accessed from the LAN. And the second part (copy) will check the possibility of the file operations. With counting the time of the coping process you can also calculate the speed of the share that was used by your script.