APC RAID Subsystem SCSI-SATA II User Manual Page 13

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CHAP
Challenge Handshake Authentication Protocol. An optional
security mechanism to control access to an iSCSI storage
system over the iSCSI data ports.
iSNS
Internet Storage Name Service.
1.2.2 RAID levels
There are different RAID levels with different degree of data protection, data
availability, and performance to host environment. The description of RAID levels are
on the following:
RAID 0
Disk striping. RAID 0 needs at least one hard drive.
RAID 1
Disk mirroring over two disks. RAID 1 needs at least two
hard drives.
N-way mirror
Extension to RAID 1 level. It has N copies of the disk.
RAID 3
Striping with parity on the dedicated disk. RAID 3 needs at
least three hard drives.
RAID 5
Striping with interspersed parity over the member disks.
RAID 3 needs at least three hard drives.
RAID 6
2-dimensional parity protection over the member disks.
RAID 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.
RAG362
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