btrfs problem 12.04

[Johnny Rosenberg]

2015-10-28 12:45 GMT+01:00 Colin Law <clanlaw at gmail.com>:

> On 28 October 2015 at 10:54, Petter Adsen <petter at synth.no> wrote:
> > On Wed, 28 Oct 2015 11:38:12 +0100
> > Johnny Rosenberg <gurus.knugum at gmail.com> wrote:
> >
> >> My desktop computer, with Ubuntu 14.04, failed on me today, it just
> refuses
> >> to start. I think I tried at least 40 times. I suspect the graphics
> card,
> >> but never mind. So I went down to the… whatever it's called in Englist,
> a
> >> place outside my apartment for storing things that are not used
> regularly,
> >> in this case located in the cellar, and found my old laptop with Ubuntu
> >> 12.04. It's been a long time since I used it, so I didn't even remember
> if
> >> it works, but here I am now, typing this email with it.
> >>
> >> Anyway, I have a USB HDD for backups and so on I wanted to bring the
> latest
> >> versions of all my documents back to this old laptop, mostly ODF files.
> The
> >> problem is that the USB disk is formatted as btrfs, which indeed is
> >> supported by Ubuntu 12.04 as well, but I get an error message that it
> can't
> >> be mounted. It asks me to do ”dmesg | tail” and here's the result:
> >>
> >> ~$ dmesg | tail
> >> [ 2087.311210] sd 4:0:0:0: [sdb] No Caching mode page found
> >> [ 2087.311216] sd 4:0:0:0: [sdb] Assuming drive cache: write through
> >> [ 2087.327918] sdb: sdb1
> >> [ 2087.332476] sd 4:0:0:0: [sdb] No Caching mode page found
> >> [ 2087.332482] sd 4:0:0:0: [sdb] Assuming drive cache: write through
> >> [ 2087.332487] sd 4:0:0:0: [sdb] Attached SCSI disk
> >> [ 2087.929468] device label Backup 2000 devid 1 transid 1253 /dev/sdb1
> >> [ 2087.930331] btrfs: disk space caching is enabled
> >> [ 2087.930337] BTRFS: couldn't mount because of unsupported optional
> >> features (60).
> >> [ 2087.948115] btrfs: open_ctree failed
> >> ~$
> >>
> >> So it seems like it ”couldn't mount because of unsupported optional
> >> features”.
> >> How can I install support for those ”optional features” on Ubuntu
> 12.04? I
> >> really need those files…
> >> I'm reasonably sure the disk isn't encrypted.
> >> I'm not very keen on upgrading to Ubuntu 14.04 at the moment since I
> now at
> >> least have something that kind of works…
> >
> > You would need a newer kernel that has support for the btrfs features
> > that are missing from the 12.04 kernel.
>
> To get over your immediate problem you could boot off a live DVD of a
> later Ubuntu and copy the data across from the stick to the hard disk.
>

That's an excellent idea really. Unfortunately I forgot to mention that
this laptop's CD/DVD unit is broken and I don't have an USB one, BUT I
guess I could try to create a 14.04 USB live stick and copy from there. I
have 4 USB connections so should work.

By the way, there is no stick. The USB disk is a HDD, but I guess that
doesn't matter much.

I kind of regret now that I went for btrfs when I installed Ubuntu on that
desktop machine, maybe I should have waited for a couple of more years;
Ext4 worked just fine for me. What's your opinion? What is the most
reasonable file system for someone like me? That is someone who formats a
drive to a certain file system and then never do anything fancy to the
drive at all. I have very little need to resize partitions all the time and
things like that.


Johnny


>
> Colin
>
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