Date: Tue, 25 Jan 2011 08:07:05 -0600 From: "J. Porter Clark" <jpc@porterclark.com> To: freebsd-questions@freebsd.org Subject: Re: How to label a GELI device Message-ID: <20110125140705.GA20041@auricle.charter.net> In-Reply-To: <4D3E8DC0.9060605@gmx.com> References: <20110125014223.GA13385@auricle.charter.net> <4D3E8DC0.9060605@gmx.com>
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On Tue, Jan 25, 2011 at 10:45:52AM +0200, Nikos Vassiliadis wrote: > 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. That's fine, but I want to label the "external" /dev/md0, not the "internal" /dev/md0.eli. What I eventually want to do is to "geli attach" the device using a name that doesn't depend on drive numbering. -- J. Porter Clark <jpc@porterclark.com>
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