Best practices for cf options
You should generally use the default options, since they represent the best choice for most configurations.
The following table lists best practices for the cf options available in Data ONTAP. These settings are changed with the options command. You use the man options command to display the man page with detailed descriptions of the options.
| Option | Recommended value and notes |
|---|---|
| cf.giveback.auto.cancel.on_network_failure | ON
Leave this option on to avoid automatic giveback without assurance that the partner's network interfaces are fully operational. |
| cf.giveback.auto.cifs.terminate.minutes | 5 minutes (default value) |
| cf.giveback.auto.delay.seconds | 600 seconds (default value) |
| cf.giveback.auto.enable | OFF (default value) Leave this option off so that in cases other than takeover due to reboot or panic, you can verify that the failure that caused the takeover is fixed before performing a giveback. Each node in an HA pair can have a different setting for this option. |
| cf.giveback.auto.after.panic.takeover | ON (default value) |
| cf.giveback.auto.override.vetoes | OFF (default value) Each node in an HA pair can have a different setting for this option. |
| cf.giveback.check.partner | ON (default value) Leave on to reduce downtime caused by a unsuccessful giveback. Each node in an HA pair can have a different setting for this option. |
| cf.hw_assist.enable | ON (default value) The node must support remote management through a Remote LAN Management card or Service Processor to enable the hardware-assisted takeover. |
| cf.hw_assist.partner.address | When using hardware-assisted takeover, the value of this option should be equal to partner's node management IP address. |
| cf.hw_assist.partner.port | 4444 (default value) |
| cf.takeover.change_fsid | ON (default value) Each node in an HA pair can have a different setting for this option. |
| cf.takeover.detection.seconds | 15 seconds (default value) If sk.process.timeout.override has been manually set, it is strongly advised that this option is set to a value larger than or equal to the value of sk.process.timeout.override+5. |
| cf.takeover.on_failure | ON (default value) Changing the value on one node automatically changes the value on the partner. |
| cf.takeover.on_network_interface_failure | OFF (default value) Changing the value on one node automatically changes the value on the partner. |
| cf.takeover.on_network_interface_failure.policy | Use all_nics to avoid spurious takeovers due to any one network interface failure. |
| cf.takeover.on_panic | ON (default value) You should not turn this option off unless you are instructed by technical support to do so. If the cf.takeover.on_panic option is set to off, a node panic will not cause an automatic takeover. |
| cf.takeover.on_reboot | For systems not licensed for FC or iSCSI, the takeover on reboot outage and subsequent giveback outage are shorter than the longer outage incurred by the reboot. You should use the default value of ON for these systems. For systems licensed for FC or iSCSI, you should use the default value of OFF. In these systems, the reboot outage is shorter than the combined takeover and giveback outage. Changing the value on one node automatically changes the value on the partner. |
| cf.takeover.on_short_uptime | ON (default value) Leave this option on to avoid outages due to failures occurring early in the node's boot process. Changing the value on one node automatically changes the value on the partner. |
| cf.takeover.use_mcrc_file | OFF (default value) Use only in MetroCluster environments. |
