It depends on the Raid Controller. If the existing disk is configured as Raid 0 you can extend to Raid 1 after attaching the second disk. If the existing disk is a normal JBOD disk you have to do backup and restore, and this is for hardware raid1
It depends on the Raid Controller. If the existing disk is configured as Raid 0 you can extend to Raid 1 after attaching the second disk. If the existing disk is a normal JBOD disk you have to do backup and restore, and this is for hardware raid1