Serial ATA RAID User’s Guide
and provide redundncy in order to withstand the failure of any individual
member, without loss of data.
SATARaid provides two RAID Set types, Striped (RAID 0) and Mirrored
(RAID 1).
Disk Striping (RAID 0)
Striping is a performance-oriented, non-redundant data mapping technique.
While Striping is discussed as a RAID Set type, it is actually does not provide
fault tolerance. With modern SATA and ATA bus mastering technology,
multiple I/O operations can be done in parallel, enhancing performance.
Striping arrays use multiple disks to form a larger virtual disk.
This figure shows a stripe set using three disks with stripe one written to disk
one, stripe two to disk two, and so forth.
Disk Mirroring (RAID 1)
Disk mirroring creates an identical twin for a selected disk by having the data
simultaneously written to two disks. This redundancy provides instantaneous
protection from a single disk failure. If a read failure occurs on one drive, the
system reads the data from the other drive.
Creating and Deleting RAID Sets (SATA3/4):
Creating and deleting RAID sets is a function found
in the Raid
Configuration Utility - Silicon Image
. During booting up, the following
message will appear, pausing for a few moments to allow the user to choose
what to do:
Press <Ctrl+S> or F4 to enter RAID utility
An easy-to-use screen will appear with the following choices in the top left:
Create RAID Set
Delete RAID Set
Rebuild RAID Set
Resolve Conflicts
Low Level Format
Below this will be listed the drives currently installed on the system.
The top right half of the screen displays directions and comments for the
user. The bottom right half lists the command keys:
Arrows up and down are Select Keys
ESC takes the user to the previous menu
Enter selects the user’s choice
Ctrl-E exits the utility.
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