Re: BTRFS in 2.6.31-rcwhatever

2009-06-18 Thread Matej Cepl
David Nielsen, Thu, 18 Jun 2009 09:21:59 +0200:
> Btrfs has been surprisingly good for me, no problems outside claiming
> the partition was full when there was 25gb left (on a 120gb drive). I
> say bring on this update, hilarity and dataloss, they do mix no matter
> what sanity says.

I just want to emphasize that I didn't want in any way to say anything 
against a great work Josef does ... I totally understand that every 
software has bugs, and well when the software is filesystem, fun things 
happen :).

Matěj

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Re: BTRFS in 2.6.31-rcwhatever

2009-06-18 Thread Josef Bacik
On Thu, Jun 18, 2009 at 5:39 AM, Peter Robinson wrote:
>> At some point in the next few weeks this kernel will land in rawhide.
>> I will try and make sure btrfs-progs-0.19 goes out at the same time.
>> The new btrfs-progs isn't essential for running the new format, so if
>> you just install the kernel you will be fine, but obviously some of
>> the commands may not work properly.
>
> Does btrfs-progs-0.19 work with both versions of the disk format? If
> so it might be worthwhile pushing them to rawhide before hand.
>

No it only works on the new format, hence the careful timing.  Thanks,

Josef

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Re: BTRFS in 2.6.31-rcwhatever

2009-06-18 Thread Peter Robinson
> At some point in the next few weeks this kernel will land in rawhide.
> I will try and make sure btrfs-progs-0.19 goes out at the same time.
> The new btrfs-progs isn't essential for running the new format, so if
> you just install the kernel you will be fine, but obviously some of
> the commands may not work properly.

Does btrfs-progs-0.19 work with both versions of the disk format? If
so it might be worthwhile pushing them to rawhide before hand.

Peter

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Re: BTRFS in 2.6.31-rcwhatever

2009-06-18 Thread David Nielsen
2009/6/18 Matej Cepl 

> Josef Bacik, Wed, 17 Jun 2009 12:27:34 -0400:
> > Btrfs will not be as stable as ext4 currently is for at least another
> > year, so it is still very much just for testing.  I am very interested
> > in hearing about bugs and getting them fixed, however there will be
> > little to nothing that I can do if you lose data.
>
> And just to increase appetite of masochists among us, this is meant very
> seriously ... I have lost /var partitions on two computers (Fedora
> without /var/lib/rpm is very interestig animal). Pray without cessation
> and have your backups ready.


 Btrfs has been surprisingly good for me, no problems outside claiming the
partition was full when there was 25gb left (on a 120gb drive). I say bring
on this update, hilarity and dataloss, they do mix no matter what sanity
says.

- David
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Re: BTRFS in 2.6.31-rcwhatever

2009-06-17 Thread Matej Cepl
Josef Bacik, Wed, 17 Jun 2009 12:27:34 -0400:
> Btrfs will not be as stable as ext4 currently is for at least another
> year, so it is still very much just for testing.  I am very interested
> in hearing about bugs and getting them fixed, however there will be
> little to nothing that I can do if you lose data.

And just to increase appetite of masochists among us, this is meant very 
seriously ... I have lost /var partitions on two computers (Fedora 
without /var/lib/rpm is very interestig animal). Pray without cessation 
and have your backups ready.

Matěj

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BTRFS in 2.6.31-rcwhatever

2009-06-17 Thread Josef Bacik
Hello,

It seems there has been some confusion about BTRFS and the new format,
so let me try and clear some things up

1) Btrfs is an experimental and unstable fs that is to be used for
testing only as it could eat your data.
2) Btrfs is an experimental and unstable fs that is to be used for
testing only as it could eat your data.
3) Btrfs is an experimental and unstable fs that is to be used for
testing only as it could eat your data.

Ok now that we have that out of the way,

4) The merge window opened last week for 2.6.31, at which point a new
disk format for btrfs was sucked into the kernel.
5) This new disk format is _incompatible_ with older kernels, which
means that older kernels will not mount a fs with the new format.
Nothing bad will happen if you try to boot into an older kernel, you
won't lose data, it just won't work.
6) This new disk format is automatic.  As soon as you boot into the
new kernel, your filesystem will be automatically converted to the new
format.  There is nothing you can do, so if you don't want the new
format, don't run the new kernel.

At some point in the next few weeks this kernel will land in rawhide.
I will try and make sure btrfs-progs-0.19 goes out at the same time.
The new btrfs-progs isn't essential for running the new format, so if
you just install the kernel you will be fine, but obviously some of
the commands may not work properly.

So if you installed onto btrfs, be careful about going to rawhide,
since you will not be able to go back if you do.

Btrfs will not be as stable as ext4 currently is for at least another
year, so it is still very much just for testing.  I am very interested
in hearing about bugs and getting them fixed, however there will be
little to nothing that I can do if you lose data.  Thank you,

Josef

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