From: "Helmut Hullen" <Hullen@t-online.de>
To: linux-btrfs@vger.kernel.org
Subject: Re: btrfs device scan
Date: 12 May 2011 08:25:00 +0200 [thread overview]
Message-ID: <BljOne7T1uB@helmut.hullen.de> (raw)
In-Reply-To: <4DCB7195.30208@gmail.com>
Hallo, Victor,
Du meintest am 12.05.11:
>>> I have a couple computers running 2.6.38
>>> (Ubuntu Natty 2.6.38-8-generic), and on both of them
>>> "btrfs device scan" comes back with nothing other than
>>> "failed to read /dev/sr0"
[..]
> $ btrfs device scan
> Scanning for Btrfs filesystems
> failed to read /dev/sr0
That's a "well known" error; "scan" tries block devices which really
cannot contain a btrfs filesystem.
People who don't use "udev" get a lot of more "failed to read" messages;
"scan" seems to try every block device which exists in "/dev".
Maybe it's more reliable if "scan" doesn't look into "dev" but uses "/
proc/partitions".
> $ btrfs filesystem show
> failed to read /dev/sr0
> Label: 'server-backup' uuid: b927ead9-2e5b-4ee8-b9f4-7209177c49d8
> Total devices 2 FS bytes used 603.17GB
> devid 1 size 1.36TB used 605.28GB path /dev/sdb1
> devid 2 size 1.36TB used 605.26GB path /dev/sdc1
That shows that (in this case) you can ignore the "scan" message.
Viele Gruesse!
Helmut
next prev parent reply other threads:[~2011-05-12 6:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 4:26 btrfs device scan Victor Roetman
2011-05-12 4:46 ` Helmut Hullen
2011-05-12 5:35 ` Victor Roetman
2011-05-12 6:25 ` Helmut Hullen [this message]
2011-05-12 6:04 ` Arne Jansen
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