MicroNet Technology 5 manual RAID 0 Striping

2-Understanding RAID

RAID 0 (Striping)

This RAID algorithm writes data across multiple disk drives instead of just one disk drive. RAID 0 does not provide any data redundancy, but

does offer the best high-speed data throughput. RAID 0 breaks up data into smaller blocks and then writes a block to each drive in the array.

Pros: Disk striping enhances both read and write performance because multiple drives are accessed simultaneously

Cons: The reliability of RAID Level 0 is less than any of its member disk drives due to its lack of redundancy.

Disk Spanning

This RAID algorithm writes data to multiple disk drives sequentially. Spanning does not provide any data redundancy, and is only as fast as a single disk drive.

Pros: Disk spanning provides a large logical volume from multiple smaller disks. The entire disk capacity is available for user access.

Disk Spanning

A0	B0	C0	D0
A1	B1	C1	D1
A2	B2	C2	D2
A3	B3	C3	D3

Cons: No fault tolerance, speed equivalent to a single disk.

RAID 1 (Disk Mirroring, Cloning)

RAID 1, also known as “disk mirroring”, distributes duplicate data simultaneously to 2 disk drives.

Pros: RAID 1 offers extremely high data reliability as all the data is redundant. If one drive fails, all data (and software applications) are preserved on the other drive. Read performance may be enhanced as the array controller can access both members of a mirrored pair in parallel.

Cons: RAID 1 volume requires double the raw

data storage capacity. During writes, there will be a minor performance penalty when compared to writing to a single disk.

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