Toshiba Magnia 560S - Manual (Page 73)

Configuring Logical Drives
Configuring RAID Controller Kit-G
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Planning the Array Configuration
Fill out Table 5.8 to help plan the array.
Table 5.8 Factors for Planning the Array Configuration
Factor 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 RAID Controller Kit-G
Are all of the hard drives and the server protected by an
uninterruptible power supply (UPS)?
Using the Array Configuration Planner
Table 5.9 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 requires at
least four drives, while RAID 50 requires at least six drives.
Array Configuration Planner
Use Table 5.9 to plan the configuration for your arrays.
Table 5.9 Array Configuration Planner
Number of
Drives Possible
RAID Levels Relative
Performance Fault
Tolerance Effective
Capacity
1 None Excellent No 100%
1 RAID 0 Excellent No 100%
2 None Excellent No 100%
2 RAID 0 Excellent No 100%
2 RAID 1 Good Yes 50%
3 None Excellent No 100%
3 RAID 0 Excellent No 100%
3 RAID 5 Good Yes 67%