■
Reliability, Performance, Capacity for Each RAID Level
Table 11 shows the comparison result of reliability, performance, capacity for each RAID level.
Table 11 RAID Level Comparison
RAID level Reliability Performance (*1) Capacity
RAID0
´
◎ ◎
RAID1
¡ ¡
△
RAID1+0
¡
◎ △
RAID5
¡ ¡ ¡
RAID5+0
¡ ¡ ¡
RAID6 ◎
¡ ¡
RAID6-FR ◎
¡ ¡
◎: Very good ¡: Good △: Reasonable ´: Poor
*1: Performance may differ according to the number of drives and the processing method from the host.
■
Recommended RAID Level
Select the appropriate RAID level according to the usage.
• Recommended RAID levels are RAID1, RAID1+0, RAID5, RAID5+0, RAID6, and RAID6-FR.
• When importance is placed upon read and write performance, a RAID1+0 configuration is recommended.
• For read only file servers and backup servers, RAID5, RAID5+0, RAID6, or RAID6-FR can also be used for higher
efficiency. However, if the drive fails, note that data restoration from parities and rebuilding process results in
a loss in performance.
• For SSDs, a RAID5 configuration or a fault tolerant enhanced RAID6 configuration is recommended because
SSDs operate much faster than other types of drive. For large capacity SSDs, using a RAID6-FR configuration,
which provides excellent performance for the rebuild process, is recommended.
• Using a RAID6 or RAID6-FR configuration is recommended when Nearline SAS disks that have 6TB or more are
used. For details on the RAID levels that can be configured with Nearline SAS disks that have 6TB or more,
refer to "Supported RAID
" (page 33).
2. Basic Functions
RAID Functions
35 Design Guide
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