Read the man page (spare-group parameter), mdadm allows for one spare drive to be used for multiple arrays. On Mon, 27 Jan 2025 at 15:15, Anton Gavriliuk <antosha20xx@xxxxxxxxx> wrote: > > How to add a spare disk to raid50 which consists of several raid5 > (7+1) ? It would be more economical and flexible than adding spare > disks to each raid5 in raid50. > > Anton >
