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StorNext File System Tuning
The Metadata Controller System
StorNext File System Tuning Guide 14
For metadata disk size, you must have a minimum of 25 GB, with more
space allocated depending on the number of files per directory and the
size of your file system.
The following table shows suggested FsBlockSize (FSB) settings and
metadata disk space based on the average number of files per directory
and file system size. The amount of disk space listed for metadata is in
addition to the 25 GB minimum amount. Use this table to determine the
setting for your configuration.
This setting is not adjustable after initial file system creation, so it is
very important to give it careful consideration during initial
configuration.
Example:
FsBlockSize 16K
Note: This is particularly true for slow CPU clock speed metadata
servers such as Sparc. However, values greater than 16K can
severely consume metadata space in cases where the file-to-
directory ratio is low (e.g. less than 100 to 1).
Average No.
of Files Per
Directory
File System SIze: Less
Than 10TB
File System Size: 10TB
or Larger
Less than 10 FSB: 16KB
Metadata: 32 GB per 1M
files
FSB: 64KB
Metadata: 128 GB per 1M
files
10-100 FSB: 16KB
Metadata: 8 GB per 1M
files
FSB: 64KB
Metadata: 32 GB per 1M
files
100-1000 FSB: 64KB
Metadata: 8 GB per 1M
files
FSB: 64KB
Metadata: 8 GB per 1M
files
1000 + FSB: 64KB
Metadata: 4 GB per 1M
files
FSB: 64KB
Metadata: 4 GB per 1M
files