Date: Sun, 12 May 2013 23:14:20 -0400 (EDT) From: Garrett Wollman <wollman@hergotha.csail.mit.edu> To: jdc@koitsu.org Cc: freebsd-stable@freebsd.org Subject: Re: Reinstalling boot blocks on a ZFS-only system Message-ID: <201305130314.r4D3EKaJ016781@hergotha.csail.mit.edu> In-Reply-To: <20130512205837.GA69605@icarus.home.lan> References: <A6940C2F-17B4-4ECF-85B6-BA8CB335486E@distal.com>
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In article <20130512205837.GA69605@icarus.home.lan>, jdc@koitsu.org writes: >You may also need to set kern.geom.debugflags=0x10 to inhibit GEOM's >"safety measure" / to permit writing to LBA 0; see GEOM(4) and search >for the word "foot". If you have set up your partitioning properly (read: following the clearly recommended best practice on the wiki), there should never, ever be any reason to do this. (That is why it's called a DEBUG flag.) The necessary and sufficient invocation is: # gpart bootcode -b /boot/pmbr -p /boot/gptzfsloader -i 1 [a]daX I have no idea how this works with MBR partitioning, but I would make one suggestion in that regard: DON'T. Whatever makes you think you want to do that, think harder and find another way. -GAWollman
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