Setting a hot spare disk

CLI reference:/disk

It's possible to assign a hot spare disk for your RAID array. In case of a disk failure - the rebuild immediately begins on the assigned spare disk. The spare is a member of the array configured with raid-role=spare on it.

Add the RAID array with the desired number of disks:

/disk/add raid-device-count=4 raid-type=5 type=raid slot=raid5

Then add the disks, as well as the spare, to the RAID. In this case we will add nvme5 as the spare:

/disk/set raid-master=raid5 raid-role=0 nvme1
/disk/set raid-master=raid5 raid-role=1 nvme2
/disk/set raid-master=raid5 raid-role=2 nvme3
/disk/set raid-master=raid5 raid-role=3 nvme4

/disk/set raid-master=raid5 raid-role=spare nvme5