[sles-beta] SLES12 Rc2 x86_64 root disk lvm2 setup btrfs

[urs.frey at post.ch]

Hi Richard

Thank you very much!
I got the error message below, when trying to extend my root fs.

v03er9:~ # btrfs filesystem resize +1.5G /dev/mapper/vg_sys-lv_root
ERROR: can't access '/dev/mapper/vg_sys-lv_root'
v03er9:~ #

> root resizing/extending isn't one of them :)
Your reconfirmation of what I found is very welcome.
In fact resizing the filesystem under a running Linux system would be somewhat acrobatic in terms of keeping consistency of the installed system, configured kernel and bootloader etc.

Thanks a lot
Best regards

Urs Frey                                              
Post CH AG
Informationstechnologie
IT Betrieb 
Webergutstrasse 12 
3030 Bern (Zollikofen) 
Telefon : ++41 (0)58 338 58 70 
FAX     : ++41 (0)58 667 30 07 
E-Mail:   urs.frey at post.ch

-----Ursprüngliche Nachricht-----
Von: sles-beta-bounces at lists.suse.com [mailto:sles-beta-bounces at lists.suse.com] Im Auftrag von Richard Brown
Gesendet: Tuesday, September 09, 2014 5:37 PM
An: sles-beta at lists.suse.com
Betreff: Re: [sles-beta] SLES12 Rc2 x86_64 root disk lvm2 setup btrfs

On Tue, 2014-09-09 at 15:09 +0000, urs.frey at post.ch wrote:
>  
> Btrfs on LVM2 would be a good solution for me, because of the
> resizing/extending feature possible.
> Installation worked well and GRUB2 found my Btrfs including /boot on
> LVM2.
> 

I'm going to allow wiser minds to comment on the supportability of your
propose configuration, but I had to comment on the above extract from
your email

BTRFS includes its own resize/extending features

https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-device

btrfs device add <dev> to add devices to the filesystem
btrfs device delete <dev> to remove them
btrfs replace start <origin device> <target device> to replace a device
with another and move all its blocks to the target device

and btrfs filesystem has the 'resize' subcommand to grow, or shrink the
size of a filesystem

https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-filesystem

There's certainly one use case I can think of where using LVM and btrfs
has benefits (full / root and /boot filesystem encryption), but
resizing/extending isn't one of them :)

Hope this helps

Richard

-- 

Richard Brown
QA Engineer
openSUSE Chairman
  
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SUSE LINUX Products GmbH,  Maxfeldstr. 5,  D-90409 Nuernberg
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