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Planning the Array Configuration 5-13
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
print servers? Does this disk array support any software system that
must be available 24 hours per day? Will the information stored in this
disk array contain large audio or video files that must be available on
demand? Will this disk array contain data from an imaging system? You
must identify the purpose of the data to be stored in the disk subsystem
before you can confidently choose a RAID level and a RAID
configuration.
5.5 Planning the Array Configuration
Fill out Table 5.8 to help plan this array.
5.5.1 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 requires two drives, RAID 10 at least four,
and RAID 50 at least six.
Table 5.8 Factors for Planning the Array Configuration
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
Number of hot spares
Amount of cache memory installed on MegaRAID SCSI 320-0
Are all of the disk drives and the server protected by a UPS?