On Thu, Nov 6, 2008 at 2:05 PM, Scott Carey <scott@richrelevance.com> wrote:
> To others that may stumble upon this thread:
> Note that Write Barriers can be very important for data integrity when power
> loss or hardware failure are a concern. Only disable them if you know the
> consequences are mitigated by other factors (such as a BBU + db using the
> WAL log with sync writes), or if you accept the additional risk to data
> loss. Also note that LVM prevents the possibility of using write barriers,
> and lowers data reliability as a result. The consequences are application
> dependent and also highly file system dependent.
I am pretty sure that with no write barriers that even a BBU hardware
caching raid controller cannot guarantee your data.
