Re: md0 error

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 12/22/2010 11:45 AM, Jiri Mothejzik wrote:
> Hello, grub2 asked me to send this bugreport, so I will. :)
>
> # grub-install /dev/sdb
> /usr/sbin/grub-probe: error: no such disk.
> Auto-detection of a filesystem of /dev/md0 failed.
> Please report this together with the output of "/usr/sbin/grub-probe
> --device-map=/boot/grub/device.map --target=fs -v /boot/grub" to
> <address@hidden>
>
>   
Which version exactly? Could you try:

grub-install --recheck /dev/sdb

> # /usr/sbin/grub-probe --device-map=/boot/grub/device.map --target=fs -v
> /boot/grub
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
> /usr/sbin/grub-probe: info: changing current directory to /dev.
> /usr/sbin/grub-probe: info: changing current directory to dri.
> /usr/sbin/grub-probe: info: changing current directory to snd.
> /usr/sbin/grub-probe: info: changing current directory to net.
> /usr/sbin/grub-probe: info: changing current directory to shm.
> /usr/sbin/grub-probe: info: changing current directory to mapper.
> /usr/sbin/grub-probe: info: opening md0.
> /usr/sbin/grub-probe: error: no such disk.
>
>
> What I am trying to do is to have software RAID1 on partition / (md0)
> and /var (md1).
> I have two disks - /dev/sda and /dev/sdb.
> I would like to have / on sw raid to have the system ready and prepared
> in case of sda crash.
> So I tried to initialize boot sector even on sdb, therefore this attempt.
>
> Actually, md0 and md1 are degraded raids only on sdb, while the system
> was originally installed only on sda.
> So still, grub boots from sda, but the data are already used from sw
> raid md0, md1 (and physically sdb).
>
> System: debian squeeze
>
> Following, you will find some more information that might be useful.
>
> # uname -a
> Linux saturn 2.6.32-5-686-bigmem #1 SMP Fri Dec 10 16:59:53 UTC 2010
> i686 GNU/Linux
>
> # cat /etc/fstab
> proc            /proc           proc    defaults        0       0
> /dev/md0        /       ext3    errors=remount-ro       0       1
> /dev/md1        /var    ext3    defaults        0       2
>
> # mount
> /dev/md0 on / type ext3 (rw,errors=remount-ro)
> tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
> proc on /proc type proc (rw,noexec,nosuid,nodev)
> sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> udev on /dev type tmpfs (rw,mode=0755)
> tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
> devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
> /dev/md1 on /var type ext3 (rw)
>
> # grub-probe -t fs_uuid /dev/md0
> grub-probe: error: cannot find a device for /dev/md0 (is /dev mounted?).
>
> # grub-probe -t fs_uuid /dev/sda1
> grub-probe: error: cannot find a device for /dev/sda1 (is /dev mounted?).
>
> # blkid
> /dev/sda1: LABEL="/" UUID="4e7e0377-e748-438b-b99c-4119cce989a6"
> TYPE="ext3" SEC_TYPE="ext2"
> /dev/sda2: LABEL="/var" UUID="b7ac39f0-0a9c-495b-8249-8ec548cb0a43"
> TYPE="ext3" SEC_TYPE="ext2"
> /dev/sda3: UUID="c6f734bc-424c-4880-99c5-fd597276c3fe" TYPE="swap"
> /dev/sdb1: UUID="9de4311f-f682-b07c-8524-84a6e390a598"
> TYPE="linux_raid_member"
> /dev/sdb2: UUID="cf4ac51d-e8a9-43eb-8524-84a6e390a598"
> TYPE="linux_raid_member"
> /dev/md1: UUID="0ea7e641-3203-4ab3-b5bf-030320295dfb" TYPE="ext3"
> /dev/md0: UUID="76bfc41b-14e7-4e30-8da1-901b14323a1a" TYPE="ext3"
>
> As grub failed to detect my sw raid, manually edited grub.cfg (actually
> booted item) is:
> menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-686-bigmem RAID'
> --class debian --class gnu-linux --class gnu --class os {
>         insmod raid
>         insmod mdraid
>         insmod ext2
>         insmod part_msdos
>         set root='(md0,msdos1)'
>         search --no-floppy --fs-uuid --set
> 76bfc41b-14e7-4e30-8da1-901b14323a1a
>         echo    'Loading Linux 2.6.32-5-686-bigmem ...'
>         linux   /boot/vmlinuz-2.6.32-5-686-bigmem
> root=UUID=76bfc41b-14e7-4e30-8da1-901b14323a1a
>         echo Loading initial ramdisk ...
>         initrd /boot/initrd.img-2.6.32-5-686-bigmem
> }
>
> That's all. Hope it will help... in case of any hints what to do or if
> you need more information, let me know. I know this is bugreport, not
> helpdesk, though. :)
>
> Cheers,
> jimo
>
> _______________________________________________
> Bug-grub mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/bug-grub
>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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