LSI MegaRAID SCSI 320-0 Zero-Channel RAID Controller Series 520 Hardware Manual page 62

5.3.1.2 Maximizing Drive Availability
5.3.1.3 Maximizing Drive Performance
5-10
Table 5.4 Capacity for RAID Levels (Cont.)
RAID
Level Description
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.
You can configure an array for optimal performance. But optimal drive
configuration for one type of application will probably not be optimal for
any other application. A basic guideline of the performance
characteristics for RAID drive arrays at each RAID level is shown in
Table 5.6.
Configuring Physical Drives, Arrays, and Logical Drives
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
Drives
Required Capacity
4 – 18 (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 arrays.) number of Arrays)
Table 5.5