Btrfs devel - Jul 2012 - Upgrading from 2.6.38, how?

Firstly I know what I''ve been doing has been less than 100% safe, but
I''ve been prepared to live with it.

For about 2 years now (you know from around the time btrfs looked like
RAID5/6 was just around the corner) I''ve had a server with a 5 disk
RAID10 btrfs array. I realise there has been quite some change to the
btrfs implementation since 2.6.38 but I''m hoping that there
shouldn''t
be anything blocking me moving to a much more modern kernel.

My proposed upgrade method is:
Boot from a live CD with the latest kernel I can find so I can do a few tests:
 A - run the fsck in read only mode to confirm things look good
 B - mount read only, confirm that I can read files well
 C - mount read write, confirm working
Install latest OS, upgrade to latest kernel, then repeat above steps.

Any likely hiccups with the above procedure and suggested alternatives?

-- 
Gareth Pye
Level 2 Judge, Melbourne, Australia
Australian MTG Forum: mtgau.com
gareth@cerberos.id.au - www.rockpaperdynamite.wordpress.com
"Dear God, I would like to file a bug report"
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On Wed, Jul 25, 2012 at 11:39 AM, Gareth Pye <gareth@cerberos.id.au>
wrote:
> My proposed upgrade method is:
> Boot from a live CD with the latest kernel I can find so I can do a few
tests:
>  A - run the fsck in read only mode to confirm things look good
>  B - mount read only, confirm that I can read files well
>  C - mount read write, confirm working
> Install latest OS, upgrade to latest kernel, then repeat above steps.
>
> Any likely hiccups with the above procedure and suggested alternatives?
I''d simply install the new OS on a new partition/subvol. This is what
I did when upgrading from natty -> oneiric -> precise.

IIRC there are some incompatibilites (e.g. space/inode cache disk
format?) but newer kernels will just do the right thing, drop the old
cache and create a new one.

-- 
Fajar
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