StorNext File System Tuning
The Metadata Controller System
Example: ThreadPoolSize 32 | # default 16, 512 KB memory per |
thread |
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ForcestripeAlignment
This setting should always be set to Yes. This is critical if the largest StripeBreadth defined is greater than 1MB. Note that this setting is not adjustable after initial file system creation.
Example: ForcestripeAlignment | Yes |
FsBlockSize
The FsBlockSize (FSB), metadata disk size, and JournalSize settings all work together. For example, the FsBlockSize must be set correctly in order for the metadata sizing to be correct. JournalSize is also dependent on the FsBlockSize.
For FsBlockSize the optimal settings for both performance and space utilization are in the range of 16K or 64K.Settings greater than 64K are not recommended because performance will be adversely impacted due to inefficient metadata I/O operations. Values less than 16K are not recommended in most scenarios because startup and failover time may be adversely impacted. Setting FsBlockSize to higher values is important for multiterabyte file systems for optimal startup and failover time.
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
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.
StorNext File System Tuning Guide | 13 |
