This will not work if the given minor is in use.
"""
+ # Zero the metadata first, in order to make sure drbdmeta doesn't
+ # try to auto-detect existing filesystems or similar (see
+ # http://code.google.com/p/ganeti/issues/detail?id=182); we only
+ # care about the first 128MB of data in the device, even though it
+ # can be bigger
+ result = utils.RunCmd([constants.DD_CMD,
+ "if=/dev/zero", "of=%s" % dev_path,
+ "bs=1048576", "count=128", "oflag=direct"])
+ if result.failed:
+ _ThrowError("Can't wipe the meta device: %s", result.output)
+
result = utils.RunCmd(["drbdmeta", "--force", cls._DevPath(minor),
"v08", dev_path, "0", "create-md"])
if result.failed: