I can't find in the documntation wath does "Not available" means in the "Disk Vital Product Information"
My concern is that this legend is shown in 3 disks and I don't have any disk failed on the system, howevwr when a disk is bypassed, the disk isn't shown as failed too, and I would like to know if it's a failed disk or just a free space on the shelve.
Normally you should see the serial number of the disk there. Please provide some more information, is this a FAS filer or a V-Series? What disk shelves (DS14 or DSx24x)? ACP enabled? What does "sysconfig -r" show? how about "storage show disk"?