Date: Tue, 25 Jan 2011 10:45:52 +0200 From: Nikos Vassiliadis <nvass9573@gmx.com> To: "J. Porter Clark" <jpc@porterclark.com> Cc: freebsd-questions@freebsd.org Subject: Re: How to label a GELI device Message-ID: <4D3E8DC0.9060605@gmx.com> In-Reply-To: <20110125014223.GA13385@auricle.charter.net> References: <20110125014223.GA13385@auricle.charter.net>
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J. Porter Clark wrote: > I have an encrypted partition, /dev/da0s1d. I can use geli > attach da0s1d and obtain a device /dev/da0s1d.eli, which is a > UFS filesystem. All that works just fine. > > I'd like to label /dev/da0s1d so that I don't have to refer to > the exact drive number, etc., which might change if I reboot > with a USB stick in the system or whatever. But glabel puts the > label in the last sector, which is where GELI stores metadata. You don't have to worry about this. geli uses the last sector for its metadata and creates a device with one sector less to its clients. The original device is 2048 sectors, the device geli provides is 2047 sectors: > moby# diskinfo /dev/md0 /dev/md0.eli > /dev/md0 512 1048576 2048 0 0 > /dev/md0.eli 512 1048064 2047 0 0 There is no way for the "internal" GEOM to mess with the "external's" metadata. > So, how do I make this work? > glabel apart from the generic device labeling, supports UFS labels which are *part* of the filesystem, that is, you *don't* have external metadata living in a sector outside the filesystem. Check tunefs manual page and specifically the -L option. HTH, Nikos
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