It is possible to tune the following items:
Communication timeout value of the GFS Shared File System(CON_TIMEOUT)
CON_TIMEOUT set up time in seconds after a communicative response is lost until it estimates a partner node to be an abnormal state in the monitoring of the node by communication. This value can be set for every file system.
The default of a communication timeout value is 180 seconds.
Specify the tuning parameters with the -o option of sfcadm(1M).
The following shows the setting example.
(Example)
# sfcadm -o CON_TIMEOUT=240 /dev/sfdsk/gfs01/rdsk/volume01 <Enter> |
Check the specified values with the -e option of sfcinfo(1M).
The following shows the example to check the values.
(Example)
# sfcinfo -e /dev/sfdsk/gfs01/dsk/volume01 | grep CON_TIMEOUT <Enter> CON_TIMEOUT=240 |
For the following cases, set the larger value to CON_TIMEOUT:
When it is expected that the loading of system becomes high
When the Live Migration function is used in an Oracle VM Server for SPARC environment (the value should be 630 seconds or more)
However, if setting the larger value to CON_TIMEOUT, the error return from a system call will take more time in case of the blockade by such as communication abnormality.
Set the smaller value to CON_TIMEOUT when there are a few file systems in use and you want to improve the response of the error return from a system call in case of the blockade by such as the communication abnormality. When the number of file system use are 10 or less and set a value of CON_TIMEOUT small, its value should be 60 seconds or more.
