On Tue, Jan 16, 2007 at 10:13:57AM -0800, Doug Ambrisko wrote: > FWIW, with this patch I find making snap-shots a lot more reliable: > > --- sys/ufs/ffs/ffs_snapshot.c.orig Wed Mar 22 09:42:31 2006 > +++ sys/ufs/ffs/ffs_snapshot.c Mon Nov 20 14:59:13 2006 > @@ -282,6 +282,8 @@ restart: > if (error) > goto out; > bawrite(nbp); > + if (cg % 10 == 0) > + ffs_syncvnode(vp, MNT_WAIT); > } > /* > * Copy all the cylinder group maps. Although the > @@ -303,6 +305,8 @@ restart: > goto out; > error = cgaccount(cg, vp, nbp, 1); > bawrite(nbp); > + if (cg % 10 == 0) > + ffs_syncvnode(vp, MNT_WAIT); > if (error) > goto out; > } > > or things can get wedged. We have some other patches as well that might > be required. As a hack on a local server we have been using snap shots > to do a "hot" back-up of a data base each morning. This is based on > 6.x.
What do you mean by "get wedged"? Are you seeing a deadlock, and if so then what are the details? When you say 6.x, do you mean up-to-date RELENG_6? There were various snapshot deadlock fixes committed over the past year including some in the past few months. Kris
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