American Megatrends MegaRAID Express 500 - Manual (Page 63)

Chapter 5 Configuring MegaRAID Express 500 49
Planning the Array Configuration
Answer the following questions about this array:
Question Answer
Number of physical disk drives in the array
Purpose of this array. Rank the following factors:
Maximize drive capacity
Maximize the safety of the data (fault tolerance)
Maximize hard drive performance and throughput
How many hot spares?
Amount of cache memory installed on MegaRAID Express 500
Are all of the disk drives and the server protected by a UPS?
Using the Array Configuration Planner The following table lists the possible RAID levels, fault
tolerance, and effective capacity for all possible drive configurations for an array
consisting of one to eight drives. This table does not take into account any hot
spare (standby) drives. You should always have a hot spare drive in case of drive
failure. RAID 1 and RAID 10 require 2, 4, 6, or 8 drives. RAID 30 and RAID 50
require at least 6 drives.