How to predict drive number change for 7.3->8.1 upgrade?

Marat N.Afanasyev amarat at
Fri Sep 17 19:06:45 UTC 2010

Michael Sperber wrote:
> "Marat N.Afanasyev"<amarat at>  writes:
>> you may try the following commands:
>> sysctl kern.geom.debugflags=16
>> foreach fs (your-filesystems)
>> glabel label your-$fs-label your-$fs-device
>> end
>> echo geom_label_load="YES">>  /boot/loader.conf
>> reboot
>> and see if the labels appear in /dev/label
> Is this safe to do?  The man page for glabel seems to imply that glabel
> should be used before newfs, and tunefs after newfs.
probably safe, but I didn't try this. there's another option: you may 
consider to create gmirror device that allows you to shoot two ducks 
with one arrow: 1) make your system fail-safe 2) all your devices will 
be in form /dev/mirror/devXsYl regardless of underlying adX-s. to do 
this all you need is a second hard drive large enough to serve as copy 
of your boot drive

SY, Marat

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