Mount via /etc/fstab constant failure

Mount via /etc/fstab constant failure

[regomodo]

Hi,

I have a btrfs 'pool' of x2 Samsung 500GB HDD's in non-raid format. It works 
fine for the most part except for mounting on bootup. Every bootup I have to 
change the block-device to and fro /dev/sda & /dev/sdb. This happens on 
linux-2.6.32.2 and 2.6.33-rc2.

My relevant fstab section is:

/dev/sda        /mnt/btrfs      btrfs           defaults                0       
0
/dev/sda       /home           btrfs           subvol=HOME             0       
1
/dev/sdb       /media/data     btrfs           subvol=DATA            0       
0 

I get some output in /var/log/messages (2.6.32.2) also:
Dec 31 11:05:17 funtoo-pc kernel: device label BTRFS devid 1 transid 12372 
/dev/sda                         
Dec 31 11:05:17 funtoo-pc kernel: btrfs: failed to read the system array on 
sda                             
Dec 31 11:05:17 funtoo-pc kernel: btrfs: open_ctree failed                                                  

Is this a known issue as I know of one other person with exactly the same 
issue?

Regards

Reg

Re: Mount via /etc/fstab constant failure

[Chris Ball]

Hi Reg,

   > Hi, I have a btrfs 'pool' of x2 Samsung 500GB HDD's in non-raid
   > format. It works fine for the most part except for mounting on
   > bootup. Every bootup I have to change the block-device to and fro
   > /dev/sda & /dev/sdb. This happens on linux-2.6.32.2 and
   > 2.6.33-rc2.

Are you running "btrfsctl -a" in an initrd?  It's necessary to do that
before the mount call on a multi-disk volume.

- Chris.
-- 
Chris Ball   <cjb@laptop.org>
One Laptop Per Child

Re: Mount via /etc/fstab constant failure

[regomodo]

On Thursday 31 December 2009 19:24:12 Chris Ball wrote:
> Hi Reg,
> 
>    > Hi, I have a btrfs 'pool' of x2 Samsung 500GB HDD's in non-raid
>    > format. It works fine for the most part except for mounting on
>    > bootup. Every bootup I have to change the block-device to and fro
>    > /dev/sda & /dev/sdb. This happens on linux-2.6.32.2 and
>    > 2.6.33-rc2.
> 
> Are you running "btrfsctl -a" in an initrd?  It's necessary to do that
> before the mount call on a multi-disk volume.
I did not know that. I've just given it a try on Funtoo and Ubuntu and it 
makes no difference. On Funtoo, my small script runs 'btrfsctl -a' at the boot 
runlevel but I still get those 3 errors. I even try running 'btrfsctl -a' 
again before I try 'mount -av' but still no luck.
> - Chris.
> 

Re: Mount via /etc/fstab constant failure

[Adrian von Bidder]

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On Thursday 31 December 2009 21.44:58 regomodo wrote:
> On Thursday 31 December 2009 19:24:12 Chris Ball wrote:
> > Hi Reg,
> >
> >    > Hi, I have a btrfs 'pool' of x2 Samsung 500GB HDD's in non-raid
> >    > format. It works fine for the most part except for mounting on
> >    > bootup. Every bootup I have to change the block-device to and fro
> >    > /dev/sda & /dev/sdb. This happens on linux-2.6.32.2 and
> >    > 2.6.33-rc2.
> >
> > Are you running "btrfsctl -a" in an initrd?  It's necessary to do that
> > before the mount call on a multi-disk volume.
> 
> I did not know that. I've just given it a try on Funtoo and Ubuntu and it
> makes no difference. On Funtoo, my small script runs 'btrfsctl -a' at the
>  boot runlevel but I still get those 3 errors. I even try running
>  'btrfsctl -a' again before I try 'mount -av' but still no luck.

I had a similar issue and discovered that "btrfsctl -a" doesn't load the 
btrfs module.  So I do "modprobe btrfs; btrfsctl -a"

cheers
-- vbi


-- 
The idea is that you can only get in trouble for what you actually did.
What a concept.
        -- Pam Jones, Groklaw

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Re: Mount via /etc/fstab constant failure

[regomodo]

On Friday 01 January 2010 13:51:26 Adrian von Bidder wrote:
> On Thursday 31 December 2009 21.44:58 regomodo wrote:
> > On Thursday 31 December 2009 19:24:12 Chris Ball wrote:
> > > Hi Reg,
> > >
> > >    > Hi, I have a btrfs 'pool' of x2 Samsung 500GB HDD's in non-raid
> > >    > format. It works fine for the most part except for mounting on
> > >    > bootup. Every bootup I have to change the block-device to and fro
> > >    > /dev/sda & /dev/sdb. This happens on linux-2.6.32.2 and
> > >    > 2.6.33-rc2.
> > >
> > > Are you running "btrfsctl -a" in an initrd?  It's necessary to do that
> > > before the mount call on a multi-disk volume.
> >
> > I did not know that. I've just given it a try on Funtoo and Ubuntu and it
> > makes no difference. On Funtoo, my small script runs 'btrfsctl -a' at the
> >  boot runlevel but I still get those 3 errors. I even try running
> >  'btrfsctl -a' again before I try 'mount -av' but still no luck.
btrfs is compiled into my kernel. Should I make it a module instead?
> I had a similar issue and discovered that "btrfsctl -a" doesn't load the
> btrfs module.  So I do "modprobe btrfs; btrfsctl -a"
> 
> cheers
> -- vbi
>