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Compaq ProLiant ML330 Generation 2 Server Setup and Installation Guide
Compaq Confidential – Need to Know Required
Writer:
Jennifer Hayward
Project:
Compaq ProLiant ML330 Generation 2 Server Setup and Installation Guide
Comments:
Part Number:
234833-001
File Name:
g-ch6 Integrated ATA RAID Utility.doc
Last Saved On:
6/28/01 1:22 PM
RAID Terminology
IMPORTANT:
Only RAID levels 0, 1, and 0+1 are supported by the Integrated ATA RAID
Configuration Utility.
RAID 0 (Stripe)
RAID 0 is a RAID level that involves breaking up data into smaller blocks and
then writing a block to each drive in the array (striping). RAID 0 does not
provide any data redundancy, but does offer the best performance of any
RAID level.
RAID 1 (Mirror)
RAID 1 is a RAID level that involves duplicating all data from one drive to a
second drive (mirroring). RAID 1 provides complete data redundancy, but at
the cost of doubling the required data storage capacity. You must have a
minimum of two hard drives to support RAID 1.
RAID 0+1
RAID 0+1 (also known as RAID 10) is a RAID level that provides both
striping and mirroring capabilities. RAID 0+1 mirrors data from one drive to
another and then stripes the data across a second set of drives. You must have
a minimum of four hard drives to support RAID 0+1.
RAID 5
RAID 5 is not supported by the Integrated ATA RAID Configuration Utility.
It is a RAID level that stripes data and parity information across drives and
requires a minimum of three hard drives.
Spare
The spare option in the utility assigns an extra, unused drive as a spare to be
used in case of a drive failure.
IMPORTANT:
The spare option is applicable only in arrays with redundancy, such as
RAID 1, RAID 0+1, and RAID 5. If a spare is not available, the failed drive must be
replaced with a new drive so that the data on the failed drive can be rebuilt. The
replacement drive capacity must be greater than or equal to the failed drive it replaces.