Re: [PATCHES] O_DIRECT for WAL writes

Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom Lane wrote:
>> The reason I question "automatic" is that you really want to test each
>> drive being used, if the system has more than one; but Postgres has no
>> idea what the actual hardware layout is, and so no good way to know what
>> needs to be tested.

> Some folks have battery-backed cached controllers so they would appear
> as not handling fsync when in fact they do.

Right, so something like refusing to start if we think fsync doesn't
work is probably not a hot idea.  (Unless you want to provide a GUC
variable to override it...)

			regards, tom lane