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StorNext File System Tuning
The Metadata Controller System
StorNext File System Tuning Guide 12
Example:
[stripeGroup VideoFiles]
Status UP
Exclusive Yes ##These Two lines set Exclusive stripeGroup##
Affinity VidFiles ##for Video Files Only##
Read Enabled
Write Enabled
StripeBreadth 4M
MultiPathMethod Rotate
Node CvfsDisk2 0
Node CvfsDisk3 1
BufferCacheSize 0
This setting consumes up to 2X bytes of memory times the number
specified. Increasing this value can reduce latency of any metadata
operation by performing a
hot cache access to directory blocks, inode
information, and other metadata info. This is about 10 to 1000 times faster
than I/O. It is especially important to increase this setting if metadata I/O
latency is high, (for example, more than 2ms average latency). We
recommend sizing this according to how much memory is available;
more is better. Optimal settings for
BufferCacheSize range from 16MB to
128MB.
Example:
# BufferCacheSize 64M # default 32MB
InodeCacheSize 0
This setting consumes about 800-1000 bytes of memory times the number
specified. Increasing this value can reduce latency of any metadata
operation by performing a hot cache access to inode information instead
of an I/O to get inode info from disk, about 100 to 1000 times faster. It is
especially important to increase this setting if metadata I/O latency is
high, (for example, more than 2ms average latency). You should try to
size this according to the sum number of working set files for all clients.
Optimal settings for
InodeCacheSize range from 16K to 128K.
Example:
InodeCacheSize 16K # 1000-1200 bytes each, default 8K