Kevin Grittner wrote: > Bruce Momjian <bruce@xxxxxxxxxx> wrote: > > > With a BBU you can turn off full_page_writes > > My understanding is that that is not without risk. What happens if > the WAL is written, there is a commit, but the data page has not yet > been written to the controller? Don't we still have a torn page? I don't see how full_page_writes affect non-written pages to the controller. full_page_writes is designed to guard against a partial write to a device. I don't think the raid cache can be partially written to, and the cache will not be cleared until the drive has fully writen the data to disk. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
