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Table 8 Failback settings by operating system (continued)

Supported settingsDefault behaviorOperating system

Path A/B – Failover only

Path A/B – Failover/Failback

No preferenceHost follows the unit

OpenVMS

Path A/B – Failover only

Path A/B – Failover/Failback

(recommended)

No preferenceHost follows the unit

Oracle Solaris

Path A/B – Failover only

Path A/B – Failover/Failback

No preferenceHost follows the unit

VMware

Path A/B – Failover only

Path A/B – Failover/Failback

No preferenceFailback performed on the hostWindows

Path A/B – Failover only

Path A/B – Failover/Failback

If preference has been configured to ensure a more balanced controller configuration, the Path A/B –Failover/Failback

setting is required to maintain the configuration after a single controller reboot.

Changing virtual disk failover/failback setting

Changing the failover/failback setting of a virtual disk may impact which controller presents the

disk. Table 9 (page 38) identifies the presentation behavior that results when the failover/failback

setting for a virtual disk is changed.

NOTE: If the new setting moves the presentation of the virtual disk to a new controller, any

snapshots or snapclones associated with the virtual disk are also moved.

Table 9 Impact on virtual disk presentation when changing failover/failback setting

Impact on virtual disk presentationNew setting

None. The disk maintains its original presentation.No Preference

If the disk is currently presented on Controller 2, it is moved to Controller 1.Path A Failover

If the disk is on Controller 1, it remains there.

If the disk is currently presented on Controller 1, it is moved to Controller 2.Path B Failover

If the disk is on Controller 2, it remains there.

If the disk is currently presented on Controller 2, it is moved to Controller 1.Path A Failover/Failback

If the disk is on Controller 1, it remains there.

If the disk is currently presented on Controller 1, it is moved to Controller 2.Path B Failover/Failback

If the disk is on Controller 2, it remains there.

Implicit LUN transition

Implicit LUN transition automatically transfers management of a virtual disk to the array controller

that receives the most read requests for that virtual disk. This improves performance by reducing

the overhead incurred when servicing read I/Os on the non-managing controller. Implicit LUN

transition is enabled in all versions of XCS.

38 P63x0/P65x0 EVA operation

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