Date: Mon, 4 May 2009 13:16:30 -0500 From: Doug Poland <doug@polands.org> To: Jonathan McKeown <j.mckeown@ru.ac.za> Cc: freebsd-questions@freebsd.org Subject: Re: When a System Dies; Getting back in operation again. Message-ID: <20090504181629.GC96593@polands.org> In-Reply-To: <200905041630.53832.j.mckeown@ru.ac.za> References: <200905011707.n41H7M6b021540@dc.cis.okstate.edu> <200905041031.16748.j.mckeown@ru.ac.za> <20090504135914.GB84251@gizmo.acns.msu.edu> <200905041630.53832.j.mckeown@ru.ac.za>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, May 04, 2009 at 04:30:53PM +0200, Jonathan McKeown wrote: > On Monday 04 May 2009 15:59:14 Jerry McAllister wrote: > > On Mon, May 04, 2009 at 10:31:16AM +0200, Jonathan McKeown wrote: > > > > > If you have kept the right information beforehand, you can > > > actually restore your dumps onto ``bare metal'' without doing a > > > partial install first, and with the same newfs settings for each > > > partition as you originally had. You need to use bsdlabel and > > > dumpfs -m and keep the output for rebuilding. The rest of this > > > message is the details. > > > > If you have a specific reason to want your new filesystems' to have > > identical superblock info, you can use dumpfs -m, but you don't need > > to worry about all that. ? Just fdisk, bsdlabel and then let newfs > > take its defaults. > > Which of your filesystems currently has softupdates disabled? You may > not care - but the point is that using dumpfs in the way I described > will preserve that information (along with all the other tuning > options) for people who do care. > > If you're restoring a complete machine from backup, the less you have > to think about, the better. Knowing that my filesystems are going to > be restored with whatever tuning options I was previously running > with, without my having to try and remember, gives me peace of mind > ahead of time. > Excellent discussion. Along the lines of "the less you have to think about", is there a technique for restoring geom meta-data on bare metal? Say you have a system built upon gmirror and gjournal. One must manually create the mirror and journal before restoring from dump. But the vital geom meta-data describing your mirror/journal is on the dump. -- Regards, Doug
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090504181629.GC96593>