MSI X2-109 v1 - Manual (Page 23)

RAID Overview 1-7
Version 2.0 Copyright © 2006 by LSI Logic Corporation. All rights reserved.
1.2.2 RAID 1 Description
RAID 1 duplicates all data from one drive to a second drive. RAID 1
provides complete data redundancy, but at the cost of doubling the
required data storage capacity.
Figure 1.2 shows a RAID 1 array.
Figure 1.2 RAID 1 Array
1.2.3 RAID 5 Description
Note: If you do not have a MegaRAID SAS 8208ELP RAID
controller or a MegaRAID SAS 8208XLP RAID controller,
you might need to install a key, either iButton or TSOC, to
enable RAID 5. The key you need depends on your
supplier. Contact your supplier for more information.
RAID 5 includes disk striping at the block level and parity. Parity is the
data’s property of being odd or even, and parity checking is used to
detect errors in the data. In RAID 5, the parity information is distributed
to all drives. RAID 5 is best suited for networks that perform a lot of small
input/output (I/O) transactions simultaneously.
Uses Databases or any other mission critical environment that
requires fault tolerance
Strong Points Provides complete data redundancy; RAID 1 is ideal for any
application that requires fault tolerance
Weak Points Requires twice as many hard drives; performance is impaired
during drive rebuilds
Drives Two
Segment 1
Segment 2
Segment 3 Segment 1 Duplicated
Segment 2 Duplicated
Segment 3 Duplicated
Segment 4 Segment 4 Duplicated