Unforgiving Software Raid (2.4.20)

[Roger Oberholtzer]

On Wed, 2005-11-02 at 11:41 -0500, A. Khattri wrote:
> On Tue, 1 Nov 2005, Matthew Carpenter wrote:
> 
> > However, I will offer this rant:
> > LVM and RAID between different versions are anything but friendly.  eg.  This
> > is a SuSE 8.2 box, running 2.4.20.  When I booted off the SuSE9.0 and 9.1 and
> > Ubuntu cd's I was able to create everything just how I wanted it.  But I had
> > a difficult time getting any of the others to read the drive.  I can
> > understand not going from 2.6 to 2.4, but between the different 2.6 kernels
> > you might think things work.
> 
> I have a web server in production using software RAID - I have gone
> through various kernel upgrades (2.6.5 all the way up to 2.6.12) without
> any problems.

But not from 2.4 to 2.6? And when the next series after 2.6 is out?

If I understand correctly, in 2.4, the software RAID was 'Version 1'. In
2.6 it is 'Version 2'. Version 2 supports Version 1 RAID systems. You
can even still make a Version 1 RAID system with Version 2
implementation. But I wonder how far this will go? And, has anyone done
this between RAID version? Is there an upgrade path short of a
backup/restore? I know, you would do a backup first anyway...

(By 'Version' I mean the version of the Linux RAID code, not RAID
Levels.)

> 
> 
-- 
Roger Oberholtzer
OPQ Systems AB