Dell Shared PowerEdge RAID Controller (PERC) 8 For Dell PowerEdge VRTX Systems User’s Guide
FastPath
The Shared PERC 8 card supports FastPath feature, which improves application performance by delivering high I/O per second (IOPS).
Under specific conditions with FastPath, the I/O bypasses the controller cache and is committed directly to the physical disk from the host memory or directly from the physical disk. All simple non-spanned virtual disks configured with Write-Through write-cache policy and No Read-Ahead read-cache policy can utilize FastPath.
Workloads on SSD volumes provide the most performance improvement with FastPath.
The following conditions support
FastPath:
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Random workloads with small blocks.
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I/O block sizes smaller than virtual disk’s stripe size.
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Sequential read workloads on unspanned RAID volumes (RAID 0, RAID 1, RAID 5, and RAID 6).
-
Sequential read and write workloads on RAID 0 virtual disks.
The following conditions do not support
FastPath
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Virtual disks running background operations like rebuild, initialization, and so on.
-
Spanned RAID volumes like RAID 10, RAID 50, and RAID 60.
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