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PlatinumNAS Owner’s Manual
Chapter 5 - Understanding RAID
The PlatinumNAS controller subsystem is a high-performance SATA drive bus disk array
Controller. When properly configured, the RAID subsystem can provide non-stop service with
a high degree of fault tolerance through the use of RAID technology and advanced array
management features.
The RAID subsystem can be configured to RAID levels 0, 1 (0+1), and 5. RAID levels other
than 0 are able to tolerate a Hard Disk failure without impact on the existing data, and
failed drive data can be reconstructed from the remaining data and parity drives. RAID
configuration and monitoring can be done through the LCD front control panel or serial port.
The PlatinumNAS features the following high availability functions:
• RAID Levels 0,1,5, and JBOD
(Span) Support
• Global Online Spare
• Automatic Drive Failure Detection
• Automatic Failed Drive Rebuilding
• Hot Spare Disk Drives
• Instant Availability/Background
Initialization.
This section will help you gain understanding of how these functions can serve your needs best.
RAID
RAID is an acronym for Redundant Array of Independent Disks. It is an array of multiple
independent hard disk drives that provide high performance and fault tolerance through
support of several levels of the Berkeley RAID techniques. An appropriate RAID level is
selected when the volume sets are defined or created, and is based on disk capacity, data
availability (fault tolerance or redundancy), and disk performance considerations. The RAID
subsystem controller makes the RAID implementation and the disks’ physical configuration
transparent to the host operating system, which means that the host operating system drivers
and software utilities are not affected regardless of the RAID level selected.
5-Understanding RAID
FYI:
The Berkeley RAID levels are a family of disk array
data protection and mapping techniques described by
Garth Gibson, Randy Katz, and David Patterson in papers written
while they were performing research into I/O subsystems at the
University of California at Berkeley. There are six Berkeley RAID
Levels, usually referred to by the names RAID Level 1, etc., through
RAID Level 6.