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Re: [BackupPC-users] OT: udev rule for persistent removable device naming
2012-04-03 19:52:48
On 04/04/12 07:48, Timothy J Massey wrote:
> Jim Kyle
<jim AT jimkyle DOT com> wrote on 04/03/2012 05:21:29 PM:
>
> > On Tuesday, April 3, 2012, at 3:49:12 PM, Timothy J
Massey wrote:
> >
> > > And because sometimes the drive that I insert will
be perfectly blank (a
> > > new drive), I can't use something like a drive
label: it might not have
> > > one!
> >
> > Don't you have to partition and format the new drive
before it can be used?
>
> Sure, and that's what my script does.
>
> > If you do, you could write a "standard" disk label to it
at that time, and
> > then use that standard label in the udev rule or even to
mount the drive if
> > your version of fstab allows drives to be specified by
label.
>
> And how exactly does the script know what device name that
drive will use *before* I put that "standard" label on it? I've
already shown that the device name the drive gets is quasi-random
(race condition), and if the script guesses wrong I wipe out a
drive in my RAID array! :)
>
> If I could get Seagate et. al. to put my "standard" disk
label on the drive from the factory, I'd be golden. But until they
do, I need to make sure that the blank drive *before*
initialization shows up in the right place. And if I make that
work consistently, then I don't *need* the label! :)
Can't you see that the disk is blank (ie, has no partitions at all)
and therefore create the partitions + label/etc... That solves the
new, unknown drives problem.
For existing known drives, well, you have already labelled them, so
you know how to handle that now :)
In my similar case, I used the UUID from the drive, but then I had a
limited set of drives to deal with, and manual intervention to add
the new drive UUID (and partition/format the drive, and drop a empty
'flag' file into the partition) was suitable.
Regards,
Adam
--
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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