APC RAID Subsystem SCSI-SATA II - Manual (Page 9)

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6 needs at least four hard drives.
RAID 0+1 Mirroring of the member RAID 0 volumes. RAID 0+1 needs at
least four hard drives.
RAID 10 Striping over the member RAID 1 volumes. RAID 10 needs at
least four hard drives.
RAID 30 Striping over the member RAID 3 volumes. RAID 30 needs at
least six hard drives.
RAID 50 Striping over the member RAID 5 volumes. RAID 50 needs at
least six hard drives.
RAID 60 Striping over the member RAID 6 volumes. RAID 60 needs at
least eight hard drives.
JBOD The abbreviation of “Just a Bunch Of Disks”. JBOD needs at
least one hard drive.