On Tuesday 29 December 2009 01:30:17 david@xxxxxxx wrote: > On Tue, 29 Dec 2009, Greg Stark wrote: > > On Mon, Dec 28, 2009 at 10:54 PM, Andres Freund <andres@xxxxxxxxxxx> wrote: > >> fsync everything in that pass. > >> Including the directory - which was not done before and actually might > >> be necessary in some cases. > > > > Er. Yes. At least on ext4 this is pretty important. I wish it weren't, > > but it doesn't look like we're going to convince the ext4 developers > > they're crazy any day soon and it would really suck for a database > > created from a template to have files in it go missin. > > actually, as I understand it you need to do this on all filesystems except > ext3, and on ext3 fsync is horribly slow because it writes out > _everything_ that's pending, not just stuff related to the file you do the > fsync on. I dont think its all filesystems (ext2 should not be affected...), but generally youre right. At least jfs, xfs are affected as well. Its btw not necessarily nearly-safe and slow on ext3 as well (data=writeback). Andres -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
