How to label a GELI device
nvass9573 at gmx.com
Tue Jan 25 08:46:12 UTC 2011
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
> 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"
> 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.
More information about the freebsd-questions