Simon Riggs wrote:
> On Fri, 2007-03-30 at 11:27 +0100, Richard Huxton wrote:
>
>> Is that always true? Could the backup not pick up a partially-written
>> page? Assuming it's being written to as the backup is in progress. (We
>> are talking about when disk blocks are smaller than PG blocks here, so
>> can't guarantee an atomic write for a PG block?)
>
> Any page written during a backup has a backup block that would not be
> removable by Koichi's tool, so yes, you'd still be safe.
>
> i.e. between pg_start_backup() and pg_stop_backup() we always use full
> page writes, even if you are running in full_page_writes=off mode.
Ah, that's OK then.
--
Richard Huxton
Archonet Ltd