From: "Ted Ts'o" <tytso@mit.edu>
To: Marcin Szewczyk <Marcin.Szewczyk@wodny.org>
Cc: util-linux@vger.kernel.org
Subject: Re: Duplicate UUIDs, findmnt, /dev/disk/by-uuid
Date: Mon, 23 Apr 2012 13:07:01 -0400 [thread overview]
Message-ID: <20120423170701.GC3042@thunk.org> (raw)
In-Reply-To: <20120423154106.GD2437@magazyn-ziarno.zbozowa>
On Mon, Apr 23, 2012 at 05:41:06PM +0200, Marcin Szewczyk wrote:
>
> The system has been cloned (with dd) to many disks inserted to many
> machines. From time to time someone inserts an additional disk which has
> been previously used as the system disk. Then there are two filesystems
> with same UUIDs inserted to one machine.
This probably won't help you that much now, but best practice for
ext[234] file systems is after you clone them using dd, you should run
the command "tune2fs -U random /dev/sdXX" to reset the UUID to a new
random value. For XFS, the command is "xfs_admin -U generate /dev/sdXX".
For ntfs, the advanced utilities have a --new-serial option to ntfslabel.
It's *always* a good idea to make sure that the UUID is reset after
cloning a file system, to avoid this sort of problem.
Regards,
- Ted
next prev parent reply other threads:[~2012-04-23 17:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 15:41 Duplicate UUIDs, findmnt, /dev/disk/by-uuid Marcin Szewczyk
2012-04-23 17:07 ` Ted Ts'o [this message]
2012-04-25 7:56 ` Karel Zak
2012-04-26 7:52 ` Marcin Szewczyk
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