extlinux and btrfs RAID-1

extlinux and btrfs RAID-1

[Hugo Mills]

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   I'm trying to get a system booting, and I'm having something of a
hard time with it. I'd like to check whether anyone's managed to do
what I'm attempting, and whether I'm doing something silly, or just
need to upgrade something.

   I've got two disks, /dev/sda and /dev/sdb, each partitioned the
same way, with GPTs. The second partition on each is part of a RAID-1
(data and metadata) btrfs, with no compression.

# btrfs fi show
Label: 'amelia'  uuid: cba252b5-af1b-4f31-9f8f-191ef66f777d
	   Total devices 2 FS bytes used 1.03GB
	   devid    1 size 275.48GB used 3.04GB path /dev/sda2
	   devid    2 size 275.48GB used 3.03GB path /dev/sdb2

   I have the gptmbr.bin from extlinux installed on the boot sector of
each device:

# cat /usr/lib/syslinux/gptmbr.bin >/dev/sda
# cat /usr/lib/syslinux/gptmbr.bin >/dev/sdb

   I've attempted to install extlinux from a chroot:

# extlinux --install /boot/extlinux

   This is extlinux 4.05, which claims (on the syslinux website) to
support btrfs.

   When I boot the machine from its disks, I'm being told that
extlinux only supports single-disk btrfs. Is this still the case? Or
am I just using a version that's far too old? (Looks like there's a
v6.01 available). I can't see a list of the limitations and
capabilities of syslinux and btrfs on the syslinux website.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
     --- Great oxymorons of the world, no. 9: Standard Deviation ---     

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Re: extlinux and btrfs RAID-1

[Chris Murphy]

On Sep 27, 2013, at 1:36 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
> 
>   When I boot the machine from its disks, I'm being told that
> extlinux only supports single-disk btrfs. Is this still the case?

I'm pretty sure the answer is yes. The last time I looked not that long ago the multiple device scenario wasn't supported.


Chris Murphy

Re: extlinux and btrfs RAID-1

[Hugo Mills]

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On Fri, Sep 27, 2013 at 02:12:36PM -0600, Chris Murphy wrote:
> 
> On Sep 27, 2013, at 1:36 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
> > 
> >   When I boot the machine from its disks, I'm being told that
> > extlinux only supports single-disk btrfs. Is this still the case?
> 
> I'm pretty sure the answer is yes. The last time I looked not that long ago the multiple device scenario wasn't supported.

   Dammit.

   Thanks for the info. At least this means I don't have to struggle
with the syslinux error I've been getting... Back to grub, then.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
      --- It used to take a lot of talent and a certain type of ---      
        upbringing to be perfectly polite and have filthy manners        
            at the same time. Now all it needs is a computer.            

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Re: extlinux and btrfs RAID-1

[Chris Murphy]

On Sep 27, 2013, at 2:44 PM, Hugo Mills <hugo@carfax.org.uk> wrote:

> On Fri, Sep 27, 2013 at 02:12:36PM -0600, Chris Murphy wrote:
>> 
>> On Sep 27, 2013, at 1:36 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
>>> 
>>>  When I boot the machine from its disks, I'm being told that
>>> extlinux only supports single-disk btrfs. Is this still the case?
>> 
>> I'm pretty sure the answer is yes. The last time I looked not that long ago the multiple device scenario wasn't supported.
> 
>   Dammit.
> 
>   Thanks for the info. At least this means I don't have to struggle
> with the syslinux error I've been getting... Back to grub, then.

I'm seeing in changelogs that 4.0 brought btrfs support, 4.06 brought subvolume support. Nothing in changelogs for versions 5 and 6 so far inclusive. And interestingly enough, Fedora's koji only has 4.05 current for F20 and rawhide.



Chris Murphy

Re: extlinux and btrfs RAID-1

[Hugo Mills]

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On Fri, Sep 27, 2013 at 03:04:22PM -0600, Chris Murphy wrote:
> 
> On Sep 27, 2013, at 2:44 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
> 
> > On Fri, Sep 27, 2013 at 02:12:36PM -0600, Chris Murphy wrote:
> >> 
> >> On Sep 27, 2013, at 1:36 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
> >>> 
> >>>  When I boot the machine from its disks, I'm being told that
> >>> extlinux only supports single-disk btrfs. Is this still the case?
> >> 
> >> I'm pretty sure the answer is yes. The last time I looked not that long ago the multiple device scenario wasn't supported.
> > 
> >   Dammit.
> > 
> >   Thanks for the info. At least this means I don't have to struggle
> > with the syslinux error I've been getting... Back to grub, then.
> 
> I'm seeing in changelogs that 4.0 brought btrfs support, 4.06
> brought subvolume support. Nothing in changelogs for versions 5 and
> 6 so far inclusive. And interestingly enough, Fedora's koji only has
> 4.05 current for F20 and rawhide.

   Yeah, Debian have 4.05 in everything except experimental (which is
6.02~pre16).

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
  --- I'll take your bet, but make it ten thousand francs. I'm only ---  
                       a _poor_ corrupt official.                        

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