SPARC M8 and SPARC M7 Servers Administration Guide

Disable and Enable Automatic Failover for a DCU

The /System/DCUs/ failover property is set to auto by default, so that Oracle ILOM automates failover when a failure occurs in a DCU. During service operations such as hot-plug removal and replacement, you can suspend automated failover and manually set the Active SP configuration as required before performing the operation.

Setting DCUs to manual failover prevents ILOM from performing system initiated failover specifically for DCUs. Automated failover of the Active SP is always in effect.

On SPARC M8 and M7 servers with two DCUs, the Active SP is also the controlling SP for DCU0, so DCU0 failover can still occur in the context of an Active SP failover.

You must have the admin role (a) to perform this task.

1. Log in to Oracle ILOM.

   See Log In to Oracle ILOM (CLI).

2. Show the current state of the DCU failover property.

   -> show /System/DCUs failover
   
    /System/DCUs
       Properties:
           failover = auto
   
   

3. Set the failover property to manual.

   -> set /System/DCUs failover=manual 
   Set 'failover' to 'manual'
   

4. Perform the removal and replacement.

   See SPARC M8 and SPARC M7 Servers Service Manual for instructions.

5. Enable automatic failover when the replacement is complete.

   -> set /System/DCUs failover=auto 
   Set 'failover' to 'auto'