Re: Upgrading to kernel 2.6.8 with RAID 1 on SATA

[Philipp Kolmann <philipp@kolmann.at>]

On Mon, May 09, 2005 at 07:05:05AM +1000, Paul Gear wrote:
> md2 : active raid1 hde6[0] hdg6[1]
>       190474560 blocks [2/2] [UU]
> 
> On kernel 2.6.8 and later, the SATA drivers use libata and thus are
> discovered as /dev/sd[ab] instead of /dev/hd[eg].  If i boot using the
> latest kernel image from either sarge or sid, it panics because it can't
> find the root filesystem (presumably due to not being able to find
> /dev/hd[eg]).

I had the same problem lately since I got a second drive and built up a MD
device with a 2.4 kernel.

What I did was, that I bootet into a sarge installer (it was a fairly old RC2
i think) and there I assembled the root md device with mdadm.

Then I queried the md-device and it was stated as as md device with /dev/sd*
devices:

root@wspk:~# mdadm --examine /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 2c4a5c80:3440c46b:3a919e7d:a19e1fde
  Creation Time : Tue Apr 26 09:35:28 2005
     Raid Level : raid1
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Mon May  9 07:40:51 2005
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 6bbf5d9c - correct
         Events : 0.416840


      Number   Major   Minor   RaidDevice State
this     1       8        1        1      active sync   /dev/.static/dev/sda1

   0     0       8       17        0      active sync   /dev/.static/dev/sdb1
   1     1       8        1        1      active sync   /dev/.static/dev/sda1
root@wspk:~#

With this in place booting was no problem.

Hth
Philipp Kolmann



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