Re: Removing a Raid Partition? How-to?

Thank you. I tried the zero-superblock before but must have done something wrong because it worked this time.

For academic interest, raidstart was not being run at boottime; nothing was starting raid except the kernel (2.4.16). I tried changing the partition types to both standard Linux partitions and to Windows partitions, and I tried doing it with and without  the /etc/raidtab file It didn't seem to make any difference. The systems were originally built as Debian (Woody and Sid) with the raidtools2 packages.

I thought of trying to boot with a non-raid kernel, but that would have been a mess when it came to doing this on a production machine where all partitions are raid autodetect.

Thanks for the assist (and thanks to Gernot Weber too),

Jeff Hill


At 09:00 AM 15/05/2002 +1000, Neil Brown wrote:

On Tuesday May 14, jhill@hronline.com wrote:

quoted

Oddly, it seems I can't change the partitions of a previously formatted
raid disk.  When I use fdisk to repartition a drive previously formatted
with the type set to Linux autoraid detect, I reboot only to find the
autoraid partitions are still there. I have stopped the raid devices, but
it seems I can't kill the persistent superblock. I tried reformatting with
mke2fs and of course that failed to do the trick.

If you change the partition type to something else, it really
shouldn't autodetect any more.. Do you have an /etc/raidtab describing
the array, and is raidstart being run at boottime by some script?

In any case,
   mdadm --zero-superblock /dev/hda1

will zero the md/raid superblock on /dev/hda1

NeilBrown
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