On 04/01/2011 16:51, Andrea Gelmini wrote:
Hi all,
and thanks a lot for your effort on MdAdm.
With latest git version of mdadm tools I have
problems with creation of internal bitmap. Doing something like this:
./mdadm -Ss;./mdadm --create /dev/md0 --level=1 --raid-devices=2
--assume-clean --bitmap=internal /dev/sdb5 missing --auto=md -e
1.2;cat /proc/mdstat
mdadm: stopped /dev/md0
mdadm: /dev/sdb5 appears to be part of a raid array:
level=raid1 devices=2 ctime=Tue Jan 4 17:29:06 2011
Continue creating array? y
mdadm: array /dev/md0 started.
Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb5[0]
55777208 blocks super 1.2 [2/1] [U_]
bitmap: 1/1 pages [4KB], 65536KB chunk
I always have 1/1 pages (also with different partition sizes: 1G
as 80G, no differences).
Why is this a problem? Your bitmap is simply too small to need more than
one page, whether it's a 1G or 80G. With a 16MB bitmap chunk size on a
2TB array I have 2 pages.
If you want to see how busy the bitmap is, try `mdadm --examine-bitmap
/dev/component`
Cheers,
John.
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