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41
In the graphic below, each letter represents a unique block
of data, and each column represents a separate hard 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 5 and 10 for both: performance and
security
Understanding RAID 5
RAID 5 uses striping (at the file 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.
RAID 5 stripes both data and parity information
(error-checking information) across multiple drives. Striping
across drives improves overall performance, and the parity
information provides data protection. Because of the
error-correction capabilities, if a drive fails, the data can be
quickly and automatically fixed.
A
B
C
A
B
C
RAID 1
8512162.book Page 41 Tuesday, February 13, 2007 3:44 PM