When a GBIC is replaced in an A5x00 array (photon), Volume Manager
will not always recognize that the loop has been healed, and 
therefore will not enable the previously failed path in
Dynamic MultiPathing (DMP).  This is most likely to occur in Sun Enterprise 
Volume Manager (SEVM) versions 2.x.
                  

You can verify whether the path has been 
re-enabled or not by typing:

      vxdisk list <diskname>

and looking for the section of the output that looks like:

Multipathing information:
numpaths:   2
c1t2d0s2        state=enabled
c2t2d0s2        state=disabled

If one of the paths still shows as disabled after the GBIC has been replaced,
perform one of the following:

      vxdctl enable

or from vxva Volume Manager GUI in the 2.x versions:

Disks -> Advanced Ops -> DMP -> Reconfigure DMP

This should cause Volume Manager to recognize that the path has been restored.
                           
Keywords: SEVM, Volume Manager, configure, configured, configuration,