Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

Table 5-6
VXFEN tunable parameters (continued)
Description and Values: Default, Minimum, and Maximumvxfen Parameter
Specifies the time in seconds that the I/O fencing driver VxFEN
passes to the GAB module to wait until fencing completes its
arbitration before GAB implements its decision in the event of
a split-brain. Depending on the vxfen_mode, the GAB delay is
calculated as follows:
■ For scsi3 mode: 1000 * (vxfen_panic_timeout +
vxfen_max_delay)
■ For customized mode: 1000 * (vxfen_panic_timeout + max
(vxfen_vxfend_timeout, vxfen_loser_exit_delay))
■ Default: 10
vxfen_panic_time
In the event of a network partition, the smaller sub-cluster delays before racing
for the coordinator disks. The time delay allows a larger sub-cluster to win the
race for the coordinator disks. The vxfen_max_delay and vxfen_min_delay
parameters define the delay in seconds.
Configuring the VXFEN module parameters
After adjusting the tunable kernel driver parameters, you must reconfigure the
VXFEN module for the parameter changes to take effect.
The following example procedure changes the value of the vxfen_min_delay
parameter.
To configure the VxFEN parameters and reconfigure the VxFEN module
1
Configure the tunable parameter.
# /usr/sbin/kctune tunable=value
For example:
# /usr/sbin/kctune vxfen_min_delay=100
2
If you use Oracle 10g or Oracle 11g, stop CRS (if CRS is not under VCS control)
and verify that CRS is stopped.
Tunable parameters
About VXFEN tunable parameters
262