PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Solaris(TM) 10 Operating System)

11.2.2.3 Customizing a GFS Shared File System

Parameters for customizing a file system are provided by mkfs_sfcfs(1M), which is used to create a GFS Shared File Systems. Typical parameters are described below.

Update log area size (-o logsz=n)

Specify the size of the update log area with a value from 5 to 100 megabytes. The default size of an update log area is of 1% of the file system size. If, however, 1% of the file system is less than 5 megabytes, 5 megabytes is set. Also, if the value is greater than 50 megabytes, 50 megabytes is set.

Meta-data area size (-o metasz=n)

Specifies the size of the meta-data area. The unit is megabytes. The default is about 10% of the file system size. However, when the file system size is larger, the ratio of the meta-data area becomes smaller.

The minimum value that can be specified is same as default. The maximum value is minimum requirement size for managing 1-mega V-data. (The total number of V-data of the file system can be confirmed by executing df_sfcfs(1M).) However, larger value than the size of the representative partition cannot be specified.

Maximum data area size (-o maxdsz=n)

Specify the maximum total size of the data area when adding a file data partition as an expansion to a GFS Shared File System. If a file data partition that exceeds the maximum data space, area management information might be insufficient. If this occurs, part of free file data space might not be used. You can add a file data partition using sfcadd(1M). The maximum size is less than 1048576 megabytes (1 terabyte).

Maximum number of partitions (-o maxvol=n)

Specify the maximum number of partitions that may ever comprise this GFS Shared File System. The types of partitions configuring the GFS Shared File System are the representative partition, update log partition, and file data partition. The value specified here is the total of the partitions of all types. The default value is 16. Specifiable values are 1 to 32.