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.
For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
# mpathadm list mpath-support mpath-support: libmpscsi_vhci.so
# mpathadm modify mpath-support -a on libmpscsi_vhci.so
# 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 . .