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A single storage device failure does not cause a data failure if the storage devices are configured as a mirrored RAID 1 volume (optional). Storage devices, such as HDDs, can be removed, and when a new storage device is inserted, the contents are automatically rebuilt from the rest of the array with no need to reconfigure the RAID parameters. If the replaced storage drive was configured as a hot-spare, the new HDD is automatically configured as a new hot-spare.
Before you permanently remove a storage device from the server that is part of an active RAID volume, delete the active RAID volume from the storage device. For information about how to delete a RAID volume, use the appropriate RAID management utility for the RAID controller installed.
Caution - Possible data loss: If you insert a storage device that has been configured with a RAID volume into a server that did not previously have its storage devices configured with RAID volumes, the existing storage devices in the server will be converted to RAID volumes during automatic synchronization, and any existing data on the existing storage devices in the server is erased.