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
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.
RAIDBank5 Owner’s Manual | 15 |
