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Verifying That RAID Is Working
Your computer displays information pertaining to your RAID configuration at start-up, before loading
the operating system. If RAID is not configured, the message none defined appears under RAID
Volumes, followed by a list of the physical drives installed in your computer. If a RAID volume is
identified, you can then check the Status field to determine the current state of your RAID
configuration. The Status field contains information about the following conditions:
•
Normal
— Your RAID configuration is functioning properly.
•
Degraded
— One of your hard drives has failed. The computer is still bootable; however, RAID is not
functioning and data is not being copied to the other drive.
•
Rebuild
— Following a degraded condition, the computer has detected the replacement/connection of
a secondary hard drive and will automatically restore the RAID configuration the next time the
operating system loads.
RAID Level 0
NOTICE: Because a RAID level 0 configuration provides no data redundancy, a failure of one drive results in the
loss of all data. To protect your data when using a RAID level 0 configuration, perform regular backups.
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
drive(s) 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 storage capacities of the
drives. For example, two 120-GB hard drives combine to provide 240 GB of hard drive space on which to
store data.
NOTE: In a RAID level 0 configuration, the size of the configuration is equal to the size of the smallest drive
multiplied by the number of drives in the configuration.
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