On Fri, Dec 05, 2008 at 10:14:42AM +0100, Neil wrote: > On Thu, Dec 4, 2008 at 10:15 PM, lee <[EMAIL PROTECTED]> wrote: > > Hi, > > > > after switching from i386 to x86_64, my software RAID-1 partitions > > were not discovered automatically as they should have been. It seems > > that the physical devices (/dev/sda and /dev/sdb) have UUIDs stored > > from when I first tried to create the array, and that may have > > confused the automatic detection. > > > > My first try (a couple years ago, when the disks were new) had been to > > create a RAID-1 from the two disks and to partition that array later > > as needed. But that didn't work, so I created partitions on the disks > > and then created RAID-1 arrays from these partitions. Now it looks like > > this: > > > > <snip> > > > Note that the physical devices /dev/sda and /dev/sdb have UUIDs > > stored. How do I remove these UUIDs? > > > > You can't. The UUID is calculated out of the properties of the disk > (dunno wich exactly). It's like trying to remove the MD5 checsum of > something: you can't.
??
I accidentally did a mdadm /dev/md0 /dev/sdc (notice no partition
number), which made mdadm write a superblock, I had to zero the super
block to stop mdadm complaining about sdc, because I had partitions on
there which where being used in md devices. Why do you think you can't
zero out the md-super block for /dev/sdc ?
>
> However: your problem will be solvable and the guys who know how to do
> this are already busy.
>
> Neil
>
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