Справочное Руководство для Gateway fx540
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43
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 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
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.
In the following graphic, each letter represents a unique block
of data, and the number next to each letter represents which
copy of the data files are stored on that drive. The “P” next to
a letter represents parity (error-checking) information, and
each column represents a separate hard drive.
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.
In the following graphic, each letter represents a unique block
of data, and the number next to each letter represents which
copy of the data files are stored on that drive. The “P” next to
a letter represents parity (error-checking) information, and
each column represents a separate hard drive.
Understanding RAID 10
RAID 10 (also called RAID 1+0 or RAID 1&0) contains sets of
RAID 1 mirrors acting as drives within a RAID 0 striping array.
With this setup, the array could survive one drive failure in each
mirrored array.
RAID 1 mirrors acting as drives within a RAID 0 striping array.
With this setup, the array could survive one drive failure in each
mirrored array.
A1
B1
CP
B1
CP
A2
BP
C1
BP
C1
AP
B2
C2
B2
C2
RAID 5
8512728.book Page 43 Wednesday, September 19, 2007 3:44 PM