Thanks, but that is not the root of the problem, I have used kfed to show that all of tha ASM disk headers are OK, Oracle support think a directory tree structure has got corrupted. Re-creating the diskgroup appears to be the only fix, only so far I cannot decide on how best to move files in and out. Regards Pete On Tue, Sep 7, 2010 at 3:29 PM, Thomas Roach <troach@xxxxxxxxx> wrote: > Have you seen this post? > > http://jarneil.wordpress.com/2009/06/08/fixing-up-asm-disk-header-corruption/ > -- //www.freelists.org/webpage/oracle-l