LSI MegaRAID Confi guration for the LSI 1068 Controller User's Manual
1-4
1-3 RAID Level Review
To create a RAID storage confi guration, you will need to confi gure physical disk
drives into arrays fi rst. An array is a group of one ~ eight physical disks that is seen
as one large disk drive (logical drive) by the host computer system. Only one RAID
level can be assigned to an array.
A RAID 0 array consists of one ~ eight physical drives.
•
A RAID 1 array consists of two physical drives
•
A RAID 10 array consists of four, six or eight physical drives.
•
Warning
: Do not use both SAS and SATA drives in the same array to
avoid system malfunctioning or decreasing Mean Time Between Failures
(MTBF).
RAID 0 (Striping)
RAID 0 provides disk striping across all disk drives in an array. It does not provide
data redundancy, but it offers the best RAID performance.
RAID 0 Requires 1~8 Disk Drives
RAID 0 Example with 2 Disks
Disk Drive A
Disk Drive B
Segment 1
Segment 2
Segment 3
Segment 4
Segment 5
Segment 6
Segment 7
Segment 8
RAID 1 (Mirroring)
RAID 1 creates a duplicate copy of data by copying all data from one drive to anoth-
er. It provides data redundancy, but it doubles data storage capacity requirement.
RAID 1 Requires a minimum of 2 Disk Drives
RAID 1 Example with 2 Disks
Disk Drive A
Disk Drive B
Segment 1
Duplicate copy of Segment 1
Segment 2
Duplicate copy of Segment 2
Segment 3
Duplicate copy of Segment 3
Segment 4
Duplicate copy of Segment 4
