Dell Dimension 8400 Owner's Manual - Page 21

RAID Level 0

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your computer, then each pair of drives can be made into RAID level 0 or RAID level 1 volumes. The drives should be the same size in order to ensure that the larger drive does not contain unallocated (and therefore unusable) space. NOTE: RAID levels do not represent a hierarchy. A RAID level 1 configuration is not inherently better or worse than a RAID level 0 configuration. RAID Level 0 RAID level 0 uses a storage technique known as "data striping" to provide a high data access rate. Data striping is a method of writing consecutive segments, or stripes, of data sequentially across the physical drives to create a large virtual drive. Data striping allows one of the drives to read data while the other drive is searching for and reading the next block. serial ATA RAID configured for RAID level 0 segment 1 segment 3 segment 5 hard drive 1 segment 2 segment 4 segment 6 hard drive 2 Another advantage of a RAID level 0 configuration is that it utilizes the full capacities of the drives. For example, if you have two 120-GB drives installed, you have 240 GB on which to store data. NOTICE: Because RAID level 0 provides no data redundancy, if one drive fails, then the data on the other drive is also inaccessible. Therefore, ensure that you perform regular backups when you use a RAID level 0 configuration. RAID Level 1 RAID level 1 uses a data-redundancy storage technique known as "mirroring." When data is written to the primary drive, it is then duplicated, or mirrored, on the other drive. A RAID level 1 configuration sacrifices high data access rates for its data redundancy advantages. Setting Up and Using Your Computer 21

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Setting Up and Using Your Computer
21
your computer, then each pair of drives can be made into RAID level 0 or RAID level 1 volumes.
The drives should be the same size in order to ensure that the larger drive does not contain
unallocated (and therefore unusable) space.
NOTE:
RAID levels do not represent a hierarchy. A RAID level 1 configuration is not inherently better or
worse than a RAID level 0 configuration.
RAID Level 0
RAID level 0 uses a storage technique known as "data striping" to provide a high data access rate.
Data striping is a method of writing consecutive segments, or stripes, of data sequentially across
the physical drives to create a large virtual drive. Data striping allows one of the drives to read data
while the other drive is searching for and reading the next block.
Another advantage of a RAID level 0 configuration is that it utilizes the full capacities of the drives.
For example, if you have two 120-GB drives installed, you have 240 GB on which to store data.
NOTICE:
Because RAID level 0 provides no data redundancy, if one drive fails, then the data on the
other drive is also inaccessible. Therefore, ensure that you perform regular backups when you use a
RAID level 0 configuration.
RAID Level 1
RAID level 1 uses a data-redundancy storage technique known as "mirroring." When data is written
to the primary drive, it is then duplicated, or mirrored, on the other drive. A RAID level 1
configuration sacrifices high data access rates for its data redundancy advantages.
hard drive 1
segment 1
segment 3
segment 5
hard drive 2
segment 2
segment 4
segment 6
serial ATA RAID
configured for
RAID level 0