[Bug 803737] Re: mdadm doesn't start array with external bitmap

[Andrey]

i ended up with the following solution:

as i have the only one array and it is not used for system boot, i've
added AUTO -all to the /etc/mdadm/mdadm.conf

and created the file /etc/init/mounted-root.conf
mgr at nas:~$ cat /etc/init/mounted-root.conf

description     "assemble MD with external bitmap"

start on mounted MOUNTPOINT=/
env MOUNTPOINT=/

task

script
	mdadm --stop /dev/md0
	mdadm --assemble --scan
end script


after that array assembles correctly with external bitmap on boot.

i'm not sure about the correctness of the solution, so, please comment!

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Title:
  mdadm doesn't start array with external bitmap

Status in mdadm - Tool for managing linux software RAID arrays.:
  New
Status in “mdadm” package in Ubuntu:
  New
Status in “mdadm” package in Debian:
  Fix Released

Bug description:
  hi, all!

  i've just created a raid5 array with mdadm:
  root at nas:~# cat /proc/mdstat 
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
  md0 : active raid5 sdf1[5] sde1[3] sdd1[2] sdc1[1] sdb1[0]
        7814047744 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
        bitmap: 0/466 pages [0KB], 2048KB chunk, file: /var/md0_wr_intent

  unused devices: <none>

  root at nas:~# mdadm --detail --scan
  ARRAY /dev/md/0 metadata=1.2 bitmap=/var/md0_wr_intent name=nas:0 UUID=6b03bf85:5d6c5d4e:782f3370:ae7fbb89

  root at nas:~# mdadm --detail --scan >> /etc/mdadm/mdadm.conf
  root at nas:~# update-initramfs -k all -u

  but after reboot i get te following:

  
  root at nas:~# cat /proc/mdstat 
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
  md0 : inactive sdf1[5](S) sde1[3](S) sdd1[2](S) sdc1[1](S) sdb1[0](S)
        9767562680 blocks super 1.2
         
  unused devices: <none>

  if i issue mdadm --stop /dev/md0 and mdadm --assemble --scan, it
  assembles as desired!

  root at nas:~# cat /proc/mdstat 
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
  md0 : active raid5 sdb1[0] sdf1[5] sde1[3] sdd1[2] sdc1[1]
        7814047744 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
        bitmap: 0/466 pages [0KB], 2048KB chunk, file: /var/md0_wr_intent

  unused devices: <none>

  and if i remove bitmap= option from mdadm.conf, array starts normally on boot.
  array also starts okay with auto detection (if i remove ARRAY line from mdadm.conf), but with internal bitmap
  /var is located on rootfs, not a separate partition

  root at nas:~# lsb_release -rd
  Description:	Ubuntu 11.04
  Release:	11.04
  root at nas:~# apt-cache policy mdadm
  mdadm:
    Installed: 3.1.4-1+8efb9d1ubuntu4.1
    Candidate: 3.1.4-1+8efb9d1ubuntu4.1
    Version table:
   *** 3.1.4-1+8efb9d1ubuntu4.1 0
          500 http://ru.archive.ubuntu.com/ubuntu/ natty-updates/main i386 Packages
          100 /var/lib/dpkg/status
       3.1.4-1+8efb9d1ubuntu4 0
          500 http://ru.archive.ubuntu.com/ubuntu/ natty/main i386 Packages

  any glue how to set external bitmap without breaking things?
  Thanks in advance!

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