LSI MegaRAID SCSI 320-2 RAID Controller Series 518 Hardware Manual page 67

5.3.1.2 Maximizing Drive Availability
assumed. Table 5.4
drives required, and the capacity.
Table 5.4 Capacity for RAID Levels
RAID
Level Description
0 Striping
without parity
1 Mirroring
5 Striping with
floating parity
drive
10 Mirroring and
Striping
50 RAID 5 and
Striping
You can maximize the availability of data on the physical disk drive in the
logical array by maximizing the level of fault tolerance.
describes the levels of fault tolerance for the RAID levels.
Table 5.5 Fault Tolerance for RAID Levels
RAID Level Fault Tolerance Protection
0 No fault tolerance.
1 100% protection through data mirroring.
5 100% protection through striping and parity. The data is striped
and parity data is written across a number of physical disk
drives.
10 100% protection through data mirroring.
50 100% protection through data striping and parity. All data is
striped and parity data is written across all drives in two or
more arrays.
Creating Logical Drives
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
describes the RAID levels, including the number of
Drives
Required Capacity
1 – 30 (Number of disks) X
smallest disk
2 (Capacity of smallest disk) X (1)
3 – 30 (Number of disks) X (capacity of
smallest disk) - (capacity of 1 disk)
4 – 30 (Number of disks) X (capacity of
(Must be a smallest disk) / (2)
multiple of 2.)
6 – 30 (Must (Number of disks) X (capacity of
be a multiple smallest disk) – (capacity of 1 disk X
of the # of number of arrays)
arrays.)
capacity of
Table 5.5
5-11