ORA Database Error Messages ORA-15020: discovered duplicate ASM disk “string” September 9, 2015 mpbod ORA-15020: discovered duplicate ASM disk "string" Cause: The discovery encountered two disks claiming to be the same named ASM disk. Action: Check that the ASM_DISKSTRING parameter specifies only a single path for each disk. Back to previous menu Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)