PRIMECLUSTER Global File Services Configuration and Administration Guide 4.2 (Solaris(TM) Operating Environment)

9.1.2 Is the update log area too large?

If a system failure occurs, GFS Local File System performs a high-speed recovery of the corresponding file system based on the information in the update log area. Specifically, it reads update log information and reflects updates in the meta-data. The capability for high-speed file system recovery depends on the size of the update log area.

When the time that is allowed for file system recovery is limited, the appropriate capacity for the log area has to be estimated.

It can be estimated that 5 seconds correspond to one megabyte of the update log area.

In the standard sfxnewfs(1M) setting, the update log area size is set to less than 50 megabytes regardless of the file system capacity.