extracted from tahiti :

Whenever you set FAST_START_MTTR_TARGET to a nonzero value, and while MTTR advisory is ON, Oracle Corporation recommends that you disable (set to 0) the following parameters:

LOG_CHECKPOINT_TIMEOUT
LOG_CHECKPOINT_INTERVAL
FAST_START_IO_TARGET


if i remove LOG_CHECKPOINT_TIMEOUT from pfile the parameter appears with the value of 1800, so i set that to 0 in the
pfile.

any other ideas on how to correct this?