From the df I have 31627472KB +7906864KB= 39,534,336,000GB of available storage
No, you have 39,534,336 *KB* of available storage. Or 38,607.75 MB or 38.60775 GB.
From the sysconfig -r I have 5 data disks each with 8683 Physical MB so 5*8683MB= 43,415GB of available storage
No, because the physical storage isn't available for the filesystem. Disks are "right-sized" first.
or
From the sysconfig -r I have 5 data disk each with 8600 Used MB so
5*8600MB
= 43GB of availabe storage
Right. I'm pretty sure everywhere used in Netapp GB is 1000MB not 1024.
WHY IS MY AVAILABLE LOWER THAN IT SHOULD BE?
Because like most all filesystems (like UFS on UNIX), a certain portion of the space is "reserved" for filesystem overhead. WAFL reserves 10%. 43GB * .9 is 38.7 GB.
I'm not sure where your missing 92.25MB is. :)
Bruce