About VXFEN tunable parameters
VXFEN tunable parameters describes tunable parameters for the VXFEN driver.
vxfen Parameter
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Description and Values: Default, Minimum, and Maximum
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vxfen_debug_sz
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Size of debug log in bytes
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Values
Default: 65536
Minimum: 65536
Maximum: 256K
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vxfen_max_delay and vxfen_min_delay
(See below.)
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In the event of a network partition, the smaller cluster delays before racing for the coordinator disks. The time delayed 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.
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vxfen_max_delay
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Specifies the maximum number of seconds that the smaller sub-cluster waits before racing with larger clusters for control of the coordinator disks.
This value must be greater than the vxfen_min_delay value.
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Values
Default: 60
Minimum: 0
Maximum: 600
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vxfen_min_delay
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Specifies the minimum number of seconds that the smaller sub-cluster waits before racing with larger clusters for control of the coordinator disks. This value must be smaller than the vxfen_max_delay value.
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Values
Default: 1
Minimum: 0
Maximum: 600
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See Configuring the VXFEN parameters
Configuring the VXFEN parameters
For the parameter changes to take effect, reconfigure the VXFEN module.
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Unconfigure the VXFEN module.
# /sbin/vxfenconfig -U
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Start VCS.
# hastart
To change the VXFEN tunable parameter, use the chdev command, unload the driver, and reload the driver. Change the parameter on each cluster system. The example procedure changes the value of the vxfen_min_delay parameter.
To change the VXFEN tunable parameter
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Check the status of the driver and start it if necessary:
# /etc/methods/vxfenext -status
To start the driver:
# /etc/init.d/vxfen.rc start
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List the current value of the tunable parameter:
# lsattr -El vxfen
vxfen_min_delay=0
The current value is 1 (the default).
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Enter:
# chdev -l vxfen -P -a vxfen_min_delay=30
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Ensure that VCS is shut down. Unload and reload the driver after changing the value of the tunable:
# /etc/methods/vxfenext -stop
# /etc/methods/vxfenext -start
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Perform the commands on each cluster system to change the parameter.