The system is a FAS2220 with 12 SATA disks. 10 of them are data-disks, one parity and one dparity. For space-purposes we used all the spares as data-disk. Data ONTAP is 8.1.4P8 7-Mode. There is only the root-volume and the root-aggregate left which contains all 12 disks. Anything else was deleted.
As we dont want want to use the filer as a backup-system anymore, we like to have two spare-disks available again. The documented way to "convert" a data-disk into a spare-disk is to destroy the aggregate in which the are used, but I cannot remove/destroy the aggregate to build a new one, as it is the root-aggregat.
My question is if there is any way to change the type of two of a data-disk to a spare-disk.