Hi

We have a T320 server with H710 controller that has two disks in RAID 1 for the system drive and 3 disks in RAID 5 for storage. 

We have an issue in that backups relating to the system drive are failing - that is C Drive, Bare Metal Restore etc. with "Incorrect Function" . The D Drive, which is essentially th eRaid 5 array backups fine.

It looks like the problem is the RAID 1 array. PERCCLI shows the RAID1 array as degraded. One of the drives has a State of Unconfirmed Good and, rather than being in DG0 where it should be, it shows as Foreign (or F)

I need to to sort this but given that I don't have a backup I can restore from I am understandably a little nervous. What is the best way to put the drive back in the array?