Le 30/08/2016 à 12:14, Mirko Parthey a écrit :
On Tue, Aug 30, 2016 at 07:33:02AM +0200, Frédéric Marchal wrote:
Do I have to wipe sdb before adding it to the new computer? If so, how do I
make sure raid data is gone from every one of the three partitions?
The wipefs tool can remove RAID signatures.
Or mdadm --zero-superblock
Deleting and recreating the partitions with the same size doesn't help
on its own, because it will not affect the signatures.
Overwriting the beginning of the disk or the partitions may not be
sufficient either, because depending on the RAID superblock version, it
might be stored at the end.
The default superblock format 1.2 stores the superblock 4 KiB after the
beginning. However the OP wrote the disk was divided in several RAID
partitions, so it would not erase all the superblocks.
Or maybe mdadm will see that sda was used more recently than sdb and will
synchronize sda onto sdb?
I would advise against such experiments. It's best to wipe the signatures
while the disk is still in the old computer, then transfer it to the new
one.
I second this advice.
A bootable rescue system such as GRML can be very handy for this job.
Or you can just use the initramfs shell. Add "break" to the kernel
command line to trigger it. Or the Debian installer shell.
