Date: Wed, 20 Sep 2000 23:26:59 +0200 From: Bernd Walter <ticso@cicely5.cicely.de> To: Alfred Perlstein <bright@wintelcom.net> Cc: Edward Elhauge <ee@uncanny.net>, freebsd-hackers@FreeBSD.ORG, freebsd-isp@FreeBSD.ORG Subject: Re: Frustration with SCSI system Message-ID: <20000920232659.A2086@cicely5.cicely.de> In-Reply-To: <20000920134806.L9141@fw.wintelcom.net>; from bright@wintelcom.net on Wed, Sep 20, 2000 at 01:48:06PM -0700 References: <20000920125128.F9141@fw.wintelcom.net> <200009202024.NAA45822@ns2.uncanny.net> <20000920224341.A74548@cicely5.cicely.de> <20000920134806.L9141@fw.wintelcom.net>
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On Wed, Sep 20, 2000 at 01:48:06PM -0700, Alfred Perlstein wrote: > * Bernd Walter <ticso@cicely5.cicely.de> [000920 13:43] wrote: > > On Wed, Sep 20, 2000 at 01:24:34PM -0700, Edward Elhauge wrote: > > > OK, vinum is good. But my understanding is that you can't use vinum on > > > your root partition. By Murphy's Law it always seems to be root that gets > > > screwed up. And that also causes the biggest problems because then you > > > have to yank the system apart and find another host disk for booting. > > > > The root Filesytems doesn't really change. > > In general if you don't edit something in /etc or add accounts you can > > even be happy with a readonly /. > > I can't see any needs for mirrors beside that the host should keep running > > in case of a disk failure. A simple backup of the small /etc is sufficient. > > There's a "Zen of backup" somewhere that explains why you want to > backup system files. > > Basically: > hotswap spare read-only / and /usr == near 0 downtime, > reinstall the OS == 20-120 minutes of downtime. There is basicly no big difference in extracting the bin tgzs from the distribution compared to restoring it from a backup but the extra space won't hurt. Of course you need to have the binaries somewhere. Your numbers seem to be realistic to me but the restore case is missing here. Comparing a reinstall with a hotspare solution doesn't show a difference on wether to backup system files or not. And I was talking about / - That means for me no /var or /usr which can be mirrored (What doesn't mean that backups are not sensefull). -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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