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RAID for security
RAID 1 maintains a complete copy of a file set on each physical
hard drive in the array. Maintaining simultaneous, complete
copies of files across multiple hard drives is called mirroring.
If a drive fails, the mirrored drive takes over and acts as the
primary drive.
File reading performance (seek time) is increased using the
same methods that RAID 0 uses, although writing speed is the
same as if writing to a single hard drive.
Drawback
RAID 1 treats the entire array as a single drive with the storage
capacity of the smallest physical drive in the array. So if you
have two drives (300 GB and 250 GB) in a RAID 1 array, your
computer only recognizes a single drive with 250 GB total
capacity.
RAID for both: performance and security
RAID 5 uses striping (at the block level) with on-the-fly error
correction across all drives. Because of this error correction,
small file read/write errors can be quickly and automatically
fixed without a significant drop in system performance.
RAID 5 offers good performance and data redundancy. This
array preserves your files if a drive fails.
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RAID 1
8512066.book Page 31 Tuesday, January 16, 2007 11:02 AM