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Details

RAID Levels
RAID Level details
29
Computer Science
Professional
07/23/2013

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Term
Purpose of RAID
Definition
 Multi disk storage system acting as one logical disk

 Differing levels of redundancy and distribution techniques

 Increased data reliability or increased input/output performance

 Seen by user and OS as one single disk
Term
RAID 0
Definition
• Stripes data across multiple disks - If one disk fails all data is lost
Term
RAID 0
Definition
• No parity or mirroring - Improves speed - Striping retrieves data from storage faster
Term
RAID 0
Definition
• Non-redundant and Requires minimum of two drives
Term
RAID 0
Definition
• Block-level striping without parity or mirroring
Term
RAID 1
Definition
• Known as mirroring - At least two disks grouped as single volume
Term
RAID 1
Definition
• Only uses half of space for storage - 1:1 real time copy
Term
RAID 1
Definition
• Not suitable as permanent backup - All disks in this array are identical copies
Term
RAID 1
Definition
• Mirroring without parity or striping.
Term
RAID 2
Definition
• Bit-level striping with dedicated Hamming-code parity
Term
RAID 3
Definition
• Known as striping with dedicated parity
Term
RAID 3
Definition
• Blocks combined with parity blocks - Parity calculated using exclusive or (XOR)
Term
RAID 3
Definition
• (XOR) embedded in controller or software
Term
RAID 4
Definition
• Block-level striping with dedicated parity
Term
RAID 01
Definition
• Striped data set that is then mirrored
Term
RAID 01
Definition
• Minimum of four drives – 2 stripped and 2 mirror
Term
RAID 01
Definition
• Can involve significant computation when RW info
Term
RAID 01
Definition
• Also known as mirrored stripes
Term
RAID 10
Definition
• Mirrored data set which is then striped
Term
RAID 10
Definition
• Non-nested RAID type like RAID 1 in Linux – 2 drives – Read performance on RAID0 level
Term
RAID 5
Definition
• Data and parity bits stored across multiple disks
Term
RAID 5
Definition
• Data and parity bits stored across multiple disks
Term
RAID 5
Definition
•Provides fault tolerance
Term
RAID 5
Definition
• popular – loss of only one disk of capacity
Term
RAID 5
Definition
• As disk size grows rebuild times will take longer
Term
RAID 6
Definition
• Block-level striping with double distributed parity
Term
RAID 6
Definition
• Handles the failure of any two drives – all other drives just one
Term
RAID 6
Definition
• becoming more popular but greater capacity overhead
Term
RAID 6
Definition
•Improves rebuild times up to 2TB
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