Selecting RAID for write performanceSelecting RAID for write performance
If your environment requires high write performance, select a RAID type that is optimized for write performance
The chart below shows how RAID 10, 5, 50, 6, and 60 compare to the percent write performance of RAID 0.
The data in the chart assumes that the performance is drive limited and that drive write performance is the same as drive read performance.
Consider the following points:
RAID 5, 50, 6, and 60 performance assumes parity initialization has completed.
Write performance decreases as fault tolerance improves due to extra I/O.
Read performance is generally the same for all RAID levels except for smaller RAID 5\6 arrays.
The table below shows the Disk I/O for every host write:
Supported RAID levels may vary based on the controller model.
RAID typeRAID type Disk I/O for every host writeDisk I/O for every host write
RAID 0 1
RAID 10 2
RAID 5 4
RAID 6 6
Selecting RAID for usable capacitySelecting RAID for usable capacity
If your environment requires a high usable capacity, select a RAID type that is optimized for usable capacity. The chart in this section demonstrates the
relationship between the number of drives in the array and the percent usable capacity over the capacity for RAID 0.
Consider the following points when selecting the RAID type:
Usable capacity decreases as fault tolerance improves due to an increase in parity data.
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