About VXFEN tunable parameters
The section describes the VXFEN tunable parameters and how to reconfigure the VXFEN module.
Table: VXFEN tunable parameters describes the tunable parameters for the VXFEN driver.
Table: VXFEN tunable parameters
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vxfen Parameter
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Description and Values: Default, Minimum, and Maximum |
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dbg_log_size
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Size of debug log in bytes
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Values
Default: 131072 (128 KB)
Minimum: 65536 (64 KB)
Maximum: 524288 (512 KB)
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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 sub-clusters for control of the coordinator disks when a network partition occurs.
This value must be greater than the vxfen_min_delay value.
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Values
Default: 60
Minimum: 1
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 sub-clusters for control of the coordinator disks when a network partition occurs.
This value must be smaller than or equal to the vxfen_max_delay value.
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Values
Default: 1
Minimum: 1
Maximum: 600
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vxfen_vxfnd_tmt
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Specifies the time in seconds that the I/O fencing driver VxFEN waits for the I/O fencing daemon VXFEND to return after completing a given task.
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Values
Default: 60
Minimum: 10
Maximum: 600
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panic_timeout_offst
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Specifies the time in seconds based on which the I/O fencing driver VxFEN computes the delay to pass to the GAB module to wait until fencing completes its arbitration before GAB implements its decision in the event of a split-brain. You can set this parameter in the vxfenmode file and use the vxfenadm command to check the value. Depending on the vxfen_mode, the GAB delay is calculated as follows:
For scsi3 mode: 1000 * (panic_timeout_offst + vxfen_max_delay) For customized mode: 1000 * (panic_timeout_offst + max (vxfen_vxfnd_tmt, vxfen_loser_exit_delay)) Default: 10
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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.
