Quantum 3.1.4.1 manual FsBlockSize JournalSize

StorNext File System Tuning

The Metadata Controller System

Average No.
of Files Per	File System SIze: Less	File System Size: 10TB
Directory	Than 10TB	or Larger
Less than 10	FSB: 16KB	FSB: 64KB
	Metadata: 32 GB per 1M	Metadata: 128 GB per
	files	1M files
10-100	FSB: 16KB	FSB: 64KB
	Metadata: 8 GB per 1M	Metadata: 32 GB per 1M
	files	files
100-1000	FSB: 64KB	FSB: 64KB
	Metadata: 8 GB per 1M	Metadata: 8 GB per 1M
	files	files
1000 +	FSB: 64KB	FSB: 64KB
	Metadata: 4 GB per 1M	Metadata: 4 GB per 1M
	files	files

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

JournalSize

The optimal settings for JournalSize are in the range between 16M and 64M, depending on the FsBlockSize. Avoid values greater than 64M due to potentially severe impacts on startup and failover times. Values at the higher end of the 16M-64M range may improve performance of metadata operations in some cases, although at the cost of slower startup and failover time.

The following table shows recommended settings. Choose the setting that corresponds to your configuration.

FsBlockSize	JournalSize
16KB	16MB
64KB	64MB

14 StorNext File System Tuning Guide