| StorNext File System Tuning |
| The Metadata Controller System |
Affinity AudFiles | ##for Audio Files Only## |
Read Enabled |
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Write Enabled |
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StripeBreadth 1M |
|
MultiPathMethod Rotate |
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Node CvfsDisk4 0 |
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Node CvfsDisk5 1 |
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| |
Note: Affinity names cannot be longer than eight characters. | |
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StripeBreadth
This setting must match the RAID stripe size or be a multiple of the RAID stripe size. Matching the RAID stripe size is usually the most optimal setting. However, depending on the RAID performance characteristics and application I/O size, it might be beneficial to use a multiple of the RAID stripe size. For example, if the RAID stripe size is 256K, the stripe group contains 4 LUNs, and the application to be optimized uses DMA I/ O with 8MB block size, a StripeBreadth setting of 2MB might be optimal. In this example the 8MB application I/O is issued as 4 concurrent 2MB I/ Os to the RAID. This concurrency can provide up to a 4X performance increase. This typically requires some experimentation to determine the RAID characteristics. The lmdd utility can be very helpful. Note that this setting is not adjustable after initial file system creation.
Optimal range for the StripeBreadth setting is 128K to multiple megabytes, but this varies widely. This setting cannot be changed after being put into production, so its important to choose the setting
carfefully during initial configuration. Example:
[stripeGroup VideoFiles]
Status UP | ##These Two lines set Exclusive |
Exclusive Yes | |
stripeGroup## | ##for Video Files Only## |
Affinity VidFiles | |
Read Enabled |
|
Write Enabled |
|
StripeBreadth 4M |
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MultiPathMethod Rotate |
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Node CvfsDisk2 0 |
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Node CvfsDisk3 1 |
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StorNext File System Tuning Guide | 11 |
