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Copyright@2004~2014 Qsan Technology, Inc. All Rights Reserved.
Qsan Document – User Manual
JBOD J100 (6G SAS) JBOD controller:
JBOD J300Q (6G SAS) JBOD controller:
RAID Concepts
RAID is the abbreviation of Redundant Array of Independent Disks. The basic idea of RAID is to
combine multiple drives together to form one large logical drive. This RAID drive obtains
performance, capacity and reliability than a single drive. The operating system detects the RAID
drive as a single storage device.
RAID Levels
There are various RAID levels with different degrees of data protection, data availability, and
performance. A description of supported RAID levels follow:
Type
Description
Min. No. of Drives
RAID 0
Disk striping.
1
RAID 1
Disk mirroring over two disks.
2
N-way
mirror
Extension to RAID 1 level. It has N copies of the disk.
N
RAID 3
Striping with parity on the dedicated disk.
3
RAID 5
Striping with interspersed parity over the member disks.
3
7
7
2
7
7