Date: Fri, 8 Sep 2006 09:29:00 -0400 From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> To: Vladimir Terziev <vlady@gbservices.biz> Cc: freebsd-hackers@freebsd.org Subject: Re: Mirroring the root disk of already installed machine Message-ID: <17665.28700.948624.425733@bhuda.mired.org> In-Reply-To: <20060908100337.73c0c88d.vlady@gbservices.biz> References: <20060908100337.73c0c88d.vlady@gbservices.biz>
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In <20060908100337.73c0c88d.vlady@gbservices.biz>, Vladimir Terziev <vlady@gbservices.biz> typed: > i have a machine running FreeBSD 5.4 . It has 2 HDDs. Recently the non-root HDD failed and lost all the data on it. Since the machine is working 24/7 i want to mirror its root disk (this one with the OS on it) in order to prevent a severe downtime and data loss. > > Is there a safe way to do the above using gmirror ? Yes. I started doing it on FreeBSD 5.5. It's pretty simple: shut down to single user. Create a mirror with your root disk in it. Edit /etc/hosts to change the device name from ad* to mirror/*. Reboot. Once you're back up, add the second disk to the mirror. If you want exact instructions, consult google. The tricky part is creating the initial mirror on a mounted file system - you have to toggle a sysctl (I think that's what it was) to do that. Some directions include that; others recommend you boot on a recovery CD to create the mirror initially. BTW, this probably should have gone to -questions. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information.
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