Thread: Doesn't boot from md

i created 3 broken raid 1 arrays mdadm

code:

mdadm --create ... /dev/md0 /dev/sdb1 missing  ...

saved mdadm.conf

code:

# mdadm.conf  #  # please refer mdadm.conf(5) information file.  #    # default, scan partitions (/proc/partitions) md superblocks.  # alternatively, specify devices scan, using wildcards if desired.  device /dev/sda1 /dev/sdb1 /dev/sda2 /dev/sdb2 /dev/sda3 /dev/sdb3    # auto-create devices debian standard permissions  create owner=root group=disk mode=0660 auto=yes    # automatically tag new arrays belonging local system  homehost <system>    # instruct monitoring daemon send mail alerts  mailaddr root    # definitions of existing md arrays  array /dev/md0 level=raid1 num-devices=2 uuid=46c87704:75be5bd3:adf78dfd:3b0fefb6  array /dev/md1 level=raid1 num-devices=2 uuid=d7bb5abf:78c0b127:adf78dfd:3b0fefb6  array /dev/md2 level=raid1 num-devices=2 uuid=ba9969ae:be26c114:adf78dfd:3b0fefb6

then copied data on them, setted fstab

code:

/dev/md2        /               ext3    relatime,errors=remount-ro 0       1  /dev/md0        /boot           ext2    relatime                   0       2  /dev/md1        /home           ext2    relatime                   0       2  /dev/sda4       none            swap    sw                         0       0  /dev/sdb4       none            swap    sw                         0       0

and grub/menu.lst

code:

title		ubuntu 9.10, kernel 2.6.31-19-generic  root		(hd0,0)  kernel		/vmlinuz-2.6.31-19-generic root=/dev/md2 ro nodmraid quiet splash   initrd		/initrd.img-2.6.31-19-generic    title		ubuntu 9.10, kernel 2.6.31-19-generic (recovery mode)  root		(hd0,0)  kernel		/vmlinuz-2.6.31-19-generic root=/dev/md2 ro nodmraid  single  initrd		/initrd.img-2.6.31-19-generic    title		ubuntu 9.10, memtest86+  root		(hd0,0)  kernel		/memtest86+.bin

now if boot livecd, without mdadm.conf, should be, , run

code:

mdadm -as

creates 3 broken arrays.

want boot them, , add other disk.
bios loads right grub, md seems charged, says can't find root device.
initram shell see /dev/sdb1, 2 , 3 if run

code:

mdadm -as

says no config or superblocks found...

don't know do.

thank you

p.s. boot kernel "nodmraid" parameter.

ah, right, may need that...

code:

root@ubuntu:/home/ubuntu# fdisk -l /dev/sdb    disk /dev/sdb: 250.1 gb, 250059350016 bytes  255 heads, 63 sectors/track, 30401 cylinders  units = cylinders of 16065 * 512 = 8225280 bytes  disk identifier: 0x93b893b8       device boot      start         end      blocks   id  system  /dev/sdb1   *           1          13      104391   fd  linux raid autodetect  /dev/sdb2            7978       30400   180112747+  fd  linux raid autodetect  /dev/sdb3             145        7977    62918572+  fd  linux raid autodetect  /dev/sdb4              14         144     1052257+  82  linux swap / solaris    partition table entries not in disk order

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