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If you want only GB then you will need to just divide by the appropriate factor. GB is just dividing by 1000*1000 whereas GiB is just dividing by 1024*1024
(sumValues(toNumber(replace(toText(#Mounter:FileSystemMount:MountedFileSystem:FileSystem.size), 'None' , '0'))) / 1000000)
should work. Similarly you multiply the used by 100 and divide by the size.
If you were using a recent version you could just use sumValues without handling the no value entries.
Thanks Andrew – yeah we will be upgrading but need for the short term