btrfs-tools backport for Debian Lenny

btrfs-tools backport for Debian Lenny

[Martin Steigerwald]

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Cc'd backports-users mailing list, cc'd package maintainer Daniel Baumann as 
well.


Hi!

JFYI - most of you might prefer to run btrfs-tools from git -, I made a 
btrfs-tools 0.19 backport for Debian Lenny from the package in Debian Squeeze 
and put it online at:

http://people.teamix.net/~ms/debian/lenny-backports/btrfs-tools/

You can find discussion on sponsoring it here:

http://lists.backports.org/lurker-bpo/thread/20100217.143508.41736c9f.en.html

I think it won't work with the latest backports 2.6.30 kernel due to btrfs 
format changes, I test it with a self compiled 2.6.32.3. A 2.6.32 for 
backports org should be due soon and then my btrfs-tools backport might 
appear in the bpo archive as well.

It basically works, but I am wondering it the RAID options work correctly. I 
used:

mkfs.btrfs -d raid1 -m 
raid1 /dev/mango1/homelokal1 /dev/mango2/homelokal2

on two 200 GiB logical volumes and get 

mango:~# df -hT /mnt/zeit
Dateisystem   Typ    Größe Benut  Verf Ben% Eingehängt auf
/dev/mapper/mango1-homelokal1
             btrfs    400G  101M  400G   1% /mnt/zeit

Shouldn't that be 200GiB for a BTRFS Raid 1 setup?

Ciao,
-- 
Martin Steigerwald - team(ix) GmbH - http://www.teamix.de
gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90

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Re: btrfs-tools backport for Debian Lenny

[Miguel F Mascarenhas Sousa Filipe]

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On Wed, Feb 17, 2010 at 3:32 PM, Martin Steigerwald <ms@teamix.de> wrote:

> Cc'd backports-users mailing list, cc'd package maintainer Daniel Baumann
> as
> well.
>
>
> Hi!
>
> JFYI - most of you might prefer to run btrfs-tools from git -, I made a
> btrfs-tools 0.19 backport for Debian Lenny from the package in Debian
> Squeeze
> and put it online at:
>
> http://people.teamix.net/~ms/debian/lenny-backports/btrfs-tools/
>
> You can find discussion on sponsoring it here:
>
>
> http://lists.backports.org/lurker-bpo/thread/20100217.143508.41736c9f.en.html
>
> I think it won't work with the latest backports 2.6.30 kernel due to btrfs
> format changes, I test it with a self compiled 2.6.32.3. A 2.6.32 for
> backports org should be due soon and then my btrfs-tools backport might
> appear in the bpo archive as well.
>
> It basically works, but I am wondering it the RAID options work correctly.
> I
> used:
>
> mkfs.btrfs -d raid1 -m
> raid1 /dev/mango1/homelokal1 /dev/mango2/homelokal2
>
> on two 200 GiB logical volumes and get
>
> mango:~# df -hT /mnt/zeit
> Dateisystem   Typ    Größe Benut  Verf Ben% Eingehängt auf
> /dev/mapper/mango1-homelokal1
>             btrfs    400G  101M  400G   1% /mnt/zeit
>
> Shouldn't that be 200GiB for a BTRFS Raid 1 setup?
>
>

this has been discussed several times on the list.

Since btrfs file level redundancy policy, the proper way for it to behave is
to show full physical capacity of the devices.

Usage will be correctly accounted, so if you write a 100MB file in that
raid1 FS tree
the used space will indicate 200MB of additional used space.

Regards,



> Ciao,
> --
> Martin Steigerwald - team(ix) GmbH - http://www.teamix.de
> gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90
>



-- 
Miguel Sousa Filipe

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Fwd: btrfs-tools backport for Debian Lenny

[Miguel F Mascarenhas Sousa Filipe]

On Wed, Feb 17, 2010 at 3:32 PM, Martin Steigerwald <ms@teamix.de> wrot=
e:
>
> Cc'd backports-users mailing list, cc'd package maintainer Daniel Bau=
mann as
> well.
>
>
> Hi!
>
> JFYI - most of you might prefer to run btrfs-tools from git -, I made=
 a
> btrfs-tools 0.19 backport for Debian Lenny from the package in Debian=
 Squeeze
> and put it online at:
>
> http://people.teamix.net/~ms/debian/lenny-backports/btrfs-tools/
>
> You can find discussion on sponsoring it here:
>
> http://lists.backports.org/lurker-bpo/thread/20100217.143508.41736c9f=
=2Een.html
>
> I think it won't work with the latest backports 2.6.30 kernel due to =
btrfs
> format changes, I test it with a self compiled 2.6.32.3. A 2.6.32 for
> backports org should be due soon and then my btrfs-tools backport mig=
ht
> appear in the bpo archive as well.
>
> It basically works, but I am wondering it the RAID options work corre=
ctly. I
> used:
>
> mkfs.btrfs -d raid1 -m
> raid1 /dev/mango1/homelokal1 /dev/mango2/homelokal2
>
> on two 200 GiB logical volumes and get
>
> mango:~# df -hT /mnt/zeit
> Dateisystem =C2=A0 Typ =C2=A0 =C2=A0Gr=C3=B6=C3=9Fe Benut =C2=A0Verf =
Ben% Eingeh=C3=A4ngt auf
> /dev/mapper/mango1-homelokal1
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 btrfs =C2=A0 =C2=A0400G =C2=
=A0101M =C2=A0400G =C2=A0 1% /mnt/zeit
>
> Shouldn't that be 200GiB for a BTRFS Raid 1 setup?
>


this has been discussed several times on the list.
Since btrfs file level redundancy policy, the proper way for it to
behave is to show full physical capacity of the devices.
Usage will be correctly accounted, so if you write a 100MB file in
that raid1 FS tree
the used space will indicate 200MB of additional used space.
Regards,




--
Miguel Sousa Filipe
--
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Re: Fwd: btrfs-tools backport for Debian Lenny

[Martin Steigerwald]

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Am Mittwoch 17 Februar 2010 schrieben Sie:
> On Wed, Feb 17, 2010 at 3:32 PM, Martin Steigerwald <ms@teamix.de> 
wrote:

Leaving Cc to backports-users mailinglist and Debian package maintainer 
dropped as its a technical BTRFS discussion.

> > Hi!
[...]
> > It basically works, but I am wondering it the RAID options work
> > correctly. I used:
> >
> > mkfs.btrfs -d raid1 -m
> > raid1 /dev/mango1/homelokal1 /dev/mango2/homelokal2
> >
> > on two 200 GiB logical volumes and get
> >
> > mango:~# df -hT /mnt/zeit
> > Dateisystem   Typ    Größe Benut  Verf Ben% Eingehängt auf
> > /dev/mapper/mango1-homelokal1
> >             btrfs    400G  101M  400G   1% /mnt/zeit
> >
> > Shouldn't that be 200GiB for a BTRFS Raid 1 setup?
> 
> this has been discussed several times on the list.

Sorry, I admit I follow BTRFS irregularily and main point in my mail was 
to announce the backport.

> Since btrfs file level redundancy policy, the proper way for it to
> behave is to show full physical capacity of the devices.
> Usage will be correctly accounted, so if you write a 100MB file in
> that raid1 FS tree
> the used space will indicate 200MB of additional used space.

Hmmm, that still doesn't match, cause I wrote a 100MiB file to the 
partition:

mango:~# dd if=/dev/zero of=/mnt/zeit/ddimg bs=1M count=100
100+0 Datensätze ein
100+0 Datensätze aus
104857600 Bytes (105 MB) kopiert, 0,313594 s, 334 MB/s

Thus I should have get 200MiB used in df -h. Hmmm, maybe accurate size 
reporting needs a newer BTRFS than in 2.6.32.3?

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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