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Chapter 4 Configuring StorNext
Windows Configuration Utilities
StorNext 3.5 Installation Guide 81
Individual Buffer Size
This option sets the size of each cache buffer.
This determines the I/O transfer size used for
the buffer cache. For optimal performance,
Individual Buffer Size should match the RAID
stripe size. If Individual Buffer Size is less
than the RAID stripe size write performance
may be severely degraded.
This size must be divisible by the file system
block size. The maximum value allowed is
512K and the minimum value allowed is the
file system block size. The value default is
64K.
Minimum Total Cache
Size
This value controls the amount of memory
used to cache data from the file system. This
parameter is shared by all file systems with
the same block size.
Auto-DMA Read/Write
Sizes
Buffer Cache Auto DMA Read Length and
Buffer Cache Auto DMA Write Length control
the minimum I/O size for DMA transfers.
That is, any smaller transfer will always go
through the buffer cache.
The default value is 1MB.
Number of Read-
ahead Buffers
This option controls the size of the read-ahead
window used by the buffer cache.
The default value is 16 buffers with a
maximum of 100. Using a value of 0 disables
read-ahead.
Number of Threads
This option controls the number of dedicated
background threads used by the buffer cache
for performing I/O.
The default value is 8, with a minimum of 1
and a maximum of 100. Using a larger value
can increase I/O concurrency in the buffer
cache and therefore improve performance.
Field / Button Description