mdadm 2.4.1 through 2.5.6 works. mdadm-2.6's "Improve allocation and
use of space for bitmaps in version1 metadata"
(199171a297a87d7696b6b8c07ee520363f4603c1) would seem like the
offending change. Using 1.2 metdata works.
I get the following using the tip of the mdadm git repo or any other
version of mdadm 2.6.x:
# mdadm --create /dev/md2 --run -l 1 --metadata=1.0 --bitmap=internal
-n 2 /dev/sdf --write-mostly /dev/nbd2
mdadm: /dev/sdf appears to be part of a raid array:
level=raid1 devices=2 ctime=Wed Oct 17 10:17:31 2007
mdadm: /dev/nbd2 appears to be part of a raid array:
level=raid1 devices=2 ctime=Wed Oct 17 10:17:31 2007
mdadm: RUN_ARRAY failed: Input/output error
mdadm: stopped /dev/md2
kernel log shows:
md2: bitmap initialized from disk: read 22/22 pages, set 715290 bits, status: 0
created bitmap (350 pages) for device md2
md2: failed to create bitmap (-5)
md: pers->run() failed ...
md: md2 stopped.
md: unbind<nbd2>
md: export_rdev(nbd2)
md: unbind<sdf>
md: export_rdev(sdf)
md: md2 stopped.
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