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Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

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Configuring FastPath-capable virtual disks

All simple virtual disks configured with write cache policy Write Through and read cache policy No Read Ahead can utilize FastPath. Only IO block sizes smaller than virtual disk’s stripe size are eligible for FastPath. In addition, there should be no background operations (rebuild, initialization) running on the virtual disks. FastPath will not be used if these operations are active.
NOTE:RAID 50, and RAID 60 virtual disks cannot use FastPath.

The following table summarizes the FastPath-eligibility of read and write IOs across the supported RAID levels.

Table 1. FastPath eligibility across supported RAID levelsFastPath eligibility across supported RAID levels
Read or Write RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
Read Yes

Yes

(Optimal and Degraded)

Yes

(Optimal and Degraded)

Yes

(Optimal and Degraded)

Yes

(Optimal)

Write Yes Yes No No Yes

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