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53
IDE RAID Technology (Optional)
We are pleased to introduce the High Point IDE RAID technology, Though IDE
RAID technology has been circling the industry before, we has made it a reality
for desktops, workstations, and entry-level server manufacturers.
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IDE RAID
In a standard PC, each hard drive is seen as an independent disk designated
by letters like C, D, E, etc… In a RAID system, multiple hard drives are placed
into one or more arrays of disks. Each array is seen as an independent disk,
though that array may include upwards of two, three, four, or more drives.
This is why RAID stands for Redundant Array of Independent Disks. In an
IDE RAID array, of course, the drives are low-cost IDE.
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Features
Striping
RAID 0 basically links each drive in the array as one huge drive. Storage
capacity is determined by the smallest drive in he array. That capacity is then
applied to format all other drives in the array. If using a 4GB, 6GB, 5GB drive
in a RAID 0 array, your system will see one huge drive of 12GB (4GB x 3)
versus 15GB. RAID 0 offers double or more performance under sustained data
transfers when one drive per IDE port is used. In such a configuration, unlike
SCSI, IDE drives are always available to the system. SCSI requires more
management of the SCSI bus.
Mirroring
RAID 1 makes and maintains an identical image of data from one drive to a
second drive or from multiple drives to a second set of multiple drives.
Should one drive fail, the working drive or drive set continues operation. To
the system, such an array is still seen as a single drive letter. While RAID 1 is
the least efficient use of hard drives to provide data protection (since the user
does not see any of the additional storage capacity of the mirrored drives),
low-cost IDE makes it acceptable. If performing 1-to-1 mirroring with two
4GB drives, the system only sees one 4GB drive. IDE RAID 1 represents a
significantly lower cost than SCSI RAID 1.
RAID 0+1( Stripe/Mirror)
RAID 0+1 level to provide your system with both double data security and
double storage performance. Stripes multiple drives and mirrors to a second
striped set of drives for faster performance and fault tolerance.
Appendix V