How to Configure Automatic Failback for Specific Multipathing Support

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Asymmetric devices can provide automatic failback to a possible optimal path. If a failover occurs on the initial path, the standby path becomes the new online path. In most cases, the standby path is a suboptimal path. When automatic failback is enabled, the initial path becomes online and failover to the initial path automatically occurs.

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Display the supported multipath driver information.

# mpathadm list mpath-support
mpath-support: libmpscsi_vhci.so

Enable automatic failback support for the supported multipath driver.
```
# mpathadm modify mpath-support -a on libmpscsi_vhci.so
```

Confirm the configuration change.

# mpathadm show mpath-support libmpscsi_vhci.so
mpath-support:  libmpscsi_vhci.so
	Vendor:  Sun Microsystems
	Driver Name:  scsi_vhci
	Default Load Balance:  round-robin
	Supported Load Balance Types:  
		round-robin
		logical-block
		shortest-path
	Allows To Activate Target Port Group Access:  yes
	Allows Path Override:  no
	Supported Auto Failback Config:  1
	Auto Failback:  on
	Failback Polling Rate (current/max):  0/0
	Supported Auto Probing Config:  0
	Auto Probing:  NA
	Probing Polling Rate (current/max):  NA/NA
	Supported Devices:
		Vendor:  SUN     
		Product:  T300            
		Revision:  
		Supported Load Balance Types:
			round-robin

		Vendor:  SUN     
		Product:  T4              
		Revision:  
		Supported Load Balance Types:
			round-robin

		Vendor:  LSI     
		Product:  INF-01-00       
		Revision:  
		Supported Load Balance Types:
			round-robin

		Vendor:  NETAPP  
		Product:  INF-01-00       
		Revision:  
		Supported Load Balance Types:
			round-robin

		Vendor:  ENGENIO 
		Product:  INF-01-00       
		Revision:  
		Supported Load Balance
.
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Note - The automatic display initiated by the mpathadm modify command setting is effective while the system is running. However, to keep the changed setting persistent, you must update the /etc/driver/drv/scsi_vhci.conf file. See Configuring Automatic Failback.