I noticed one of the hosts had a warning saying that:
So basically I did what this KB article said:
I had a look at another host, and had a look at the Advanced Settings value for:
It showed a VMFS volumes /vmfs/volumes/UUID/Scratch folder for that host.
So it showed me the UUID such as this:
So it looked like there was a folder on this LUN every host!
So since I am new to this environment I had to find a way to translate the UUID to the name of the actual SAN datastore being used.
I did this by using the:
esxcli storage filesystyem list | grep UUID
This gave me the actual Volume Name. I then went and had a look at that datastore and the host already had a folder on it, so I pointed it to that in the advanced setting and rebooted the host and all was right with the world!
Here is a screen shot of the file system command, that I found in google images:
Click on the image to make it bigger!
As you can see it helps match the UUID to the actual name of the datastore
Edit: You can also do ls -la in the vmfs/volumes folder too and it will display similar info!