The vxdiskadm utility fails to replace a failed or removed disk using the options:  

  4      Remove a disk for replacement
  5      Replace a failed or removed disk

This issue is specific to the replacement of a non-root disk.  
 
An error message displays similar to the following example:

  VxVM  ERROR V-5-2-281
  Replacement of disk rootdg02 in group rootdg with device c1t1d0  
   VxVM vxdg ERROR V-5-1-559 Disk rootdg02: Name is already used

   Replace a different disk? [y,n,q,?] (default: n)

Workaround:

  Replace the disk using the following command:

   # vxdg -g $repldgname -k adddisk $repldmname=$repldaname

   For example:

   vxdg -g rootdg -k adddisk rootdg02=c1t1d0  
 

This issue is seen in the following releases:

   5.0 MP3 RP1  
 
The issue will be fixed in the following releases:
                   
  5.0 MP3 RP2