Table 11 Raid Level Comparison - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
RAID Functions
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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
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.
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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
Reliability
´
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◎
◎
33).
35
Performance (*1)
◎
¡
◎
¡
¡
¡
¡
Capacity
◎
△
△
¡
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Design Guide