Magnus Hagander wrote: > > > Should this mention that you don't need to turn it off at the disk level > > > if > > > you use fsync_writethrough? > > > > Uh, I remember we looked at this checkbox before but I don't remember > > the details, and I can't find a comment about it. Was the issue that > > writethrough always forces through the disk cache? Is that the default > > on Win32? Did we comment this somewhere? > > If you set it to fsync or fsync_writethrough it will write through the > cache. (fsync is just an alias) > If you set it to OPEN_DATASYNC, it will respond to the checkbox you are > referring to. > > OPEN_DATASYNC is the default, IIRC.
OK, docs updated: On <productname>Windows</> if <varname>wal_sync_method</> is <literal>open_datasync</> (the default), write caching is disabled by unchecking <literal>My Computer\Open\{select disk drive}\Properties\Hardware\Properties\Policies\Enable write caching on the disk</>. Also on Windows, <literal>fsync</> and <literal>fsync_writethrough</> never do write caching. -- Bruce Momjian <[EMAIL PROTECTED]> http://momjian.us EnterpriseDB http://postgres.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings