Your posting doesn't say if you pursued all the possible causes for
the ANR0534W contained in the thorough explanation for this message
in the Messages manual.  (Note that the message text specifies a
compound condition.)  In particular, check the capacity of the
destination storage pool to see if it is adequate for current needs;
and if a Disk type pool, consider disabling caching if that is
active, to see if that relieves the problem.  We don't know your
software levels: check to assure that you are at a high maintenance
level within your version and release to assure having all possible
fixes in place.

   Richard Sims