Partition Signature != 55aa

Gregory Nowak greg at
Sat Feb 11 22:52:55 EST 2006

Hash: SHA1

I haven't used software raid for a while, and when I did, it was under
the 2.4.x series of kernels. However, having said that, note that back
when I used software raid, any partitions which were a part of a raid
device had to be set to signature "FD", autodetect.

My second observation is that you seem to have 2 raid devices, one for
boot, and one for root. Under 2.4 kernels, this wouldn't work, since
the boot partition has to be on an actual partition, not on a raid

I've also had a look through the partition types that cfdisk supports,
and I don't see "55AA" as being one of them, so I don't know what kind
of a partition that is, though a google search would probably answer
that question.

Again, keep in mind that things have probably changed in newer
versions of the raid tools, and in the 2.6.x kernels, so what I've
just mentioned here may, or may not still be accurate, so you get to
keep the pieces if you follow what I've just said, and it screws
things up even more. Good luck and hth.


On Sat, Feb 11, 2006 at 04:42:49PM -0500, Rejean Proulx wrote:
> I made the mistake of booting a Windows install cd in order to ensure that
> my new server would boot.
> I then installed Fedora FC4 with raid dev/md0 as boot and /dev/md1 as root.
> It is a raid 1 with 2 partitions /dev/sba1 and /dev/sdb1 and md1 as
> /dev/sda2 /dev/sdb2. When I boot I get the message
> partition signature != 55aa. I tried booting with the rescue cd and doing a
> brub-install /dev/md0 but it did not fix the problem. How do I fix this?
> What else can I try?
>  Rejean Proulx
> Visit my family at
> MSN is:
> rejean at
> Ham License VA3REJ
>  Rejean Proulx
> Visit my family at
> MSN is: rejean at
> Ham License VA3REJ
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