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I want to create a DRBD disk with external meta data. The underlying disk for DRBD is /dev/md0.
Whenever I want to create the disk, it shows:
Quote:
# drbdadm create-md drbd0
v08 Magic number not found
md_offset 0
al_offset 4096
bm_offset 36864
Found ext2 filesystem
This would corrupt existing data.
If you want me to do this, you need to zero out the first part
of the device (destroy the content).
You should be very sure that you mean it.
Operation refused.
So, I figured I had to use dd to zero out the first part of the disk. So, I did:
Quote:
# dd if=/dev/zero of=/dev/md0 bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.0304664 s, 16.8 kB/s
but then again when I try to create the disk I get the same error:
Quote:
# drbdadm create-md drbd0
v08 Magic number not found
md_offset 0
al_offset 4096
bm_offset 36864
Found ext2 filesystem
This would corrupt existing data.
If you want me to do this, you need to zero out the first part
of the device (destroy the content).
You should be very sure that you mean it.
Operation refused.
When I have problems reformatting with real disks (it happens), I use count=200. This ensures you "get" both the (emulated these days) cylinder zero (for the MBR) and cylinder one (for the filesystem metadata).
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