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Palatis
n00b
Joined: 07 Oct 2006
Posts: 23
Location: Taipei/Taiwan
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 Posted: Sun Jan 30, 2011 12:15 pm Post subject: grub-probe / grub-mkconfig doesn't find my root device |
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Recently I'm trying grub-2 (grub-9999), and trying to let `grub-mkconfig` create grub.cfg for me.
This is my disk setup:
/dev/sda1: swap 4gb (for swsusp, must be greater than ram size for it to work...)
/dev/sda2: /boot 100mb
/dev/sda3: / 1GB
/dev/sda4: /home (rest of the disk)
`grub-install /dev/sda` works flawlessly, copies all files into '/boot/grub', but grub-mkconfig fails with
| Code: | # grub-mkconfig -o /boot/grub/grub.cfg
/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). |
I have my system mount as:
| Code: | # mount
rootfs on / type rootfs (rw)
/dev/root on / type btrfs (rw,noatime,nodiratime,compress)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
rc-svcdir on /lib64/rc/init.d type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1024k,mode=755)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
udev on /dev type tmpfs (rw,nosuid,relatime,size=10240k,mode=755)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,noatime,nodiratime)
/dev/sda4 on /home type ext4 (rw,nodev,noatime,nodiratime,barrier=1,data=ordered)
none on /tmp type tmpfs (rw,nodev,noatime,nodiratime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
gvfs-fuse-daemon on /home/palatis/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,relatime,user_id=1000,group_id=100)
/dev/sda2 on /boot type ext2 (rw,nodev,noatime,nodiratime,errors=continue) |
It looks like that / is mounted from /dev/root (instead of /dev/sda3).
I tried to do `ln -s /dev/sda3 /dev/root`, and then grub-mkconfig works without error, but the grub.cfg it generates `root=/dev/root` instead of `root=/dev/sda3` in grub.cfg:
| Code: | | linux /vmlinuz-2.6.37-gentoo root=/dev/root ro splash=silent,theme:livecd-2007.0 quiet console=tty1 resume=swap:/dev/sda1 fastboot |
which cause the boot to fail.
I have
| Code: | | /dev/sda3 / btrfs noatime,nodiratime,compress 0 1 |
in my /etc/fstab.
I think it's responsible for openrc to mount rootfs, but why is / mounted from /dev/root instead of /dev/sda3? What should I do to let `grub-probe` find the correct root for me? |
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Palatis
n00b
Joined: 07 Oct 2006
Posts: 23
Location: Taipei/Taiwan
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| Posted: Fri Feb 18, 2011 2:41 am Post subject: |
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I found out it's resposible for udev too create "/dev/root" to link against the real root device ("/dev/sda3" in my case).
udev init script runs `/lib64/udev/write_root_link_rule` to do so, but it fails on (some of) my system.
I manually ran `udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/`, but i got:
ROOT_MAJOR=0
ROOT_MINOR=13
and inside `write_root_link_rule` script it exits when it sees a "ROOT_MAJOR = 0".
I have another gentoo system which the command says:
ROOT_MAJOR=8
ROOT_MINOR=18
and the "/dev/root" is successfully linked to "/dev/sdb2"
both systems are using initrd.img created by `splash_geninitramfs` (splashutils-1.5.4.3).
both systems has "root=/dev/sda3" and "root=/dev/sdb2" in grub.cfg, respectively.
what am I missing? |
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mbar
Veteran
Joined: 19 Jan 2005
Posts: 1990
Location: Poland
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| Posted: Sat Jul 30, 2011 8:28 am Post subject: |
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| Same problem here -- is there any solution? Up until yesterday udev/grub2 worked fine. |
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hakcenter
n00b
Joined: 04 Dec 2011
Posts: 2
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| Posted: Sun Dec 04, 2011 9:52 pm Post subject: |
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| mbar wrote: | | Same problem here -- is there any solution? Up until yesterday udev/grub2 worked fine. |
I know this is a really really late reply.
I had been squandering my system, thinking my kernel was the problem, that grub2 was the problem... etc etc...
df -h
| Code: |
Filesystem Size Used Avail Use% Mounted on
rootfs 119G 7.2G 108G 7% /
/dev/root 119G 7.2G 108G 7% /
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Problem is there is no /dev/root
grub2-probe /
| Code: |
grub2-probe: error: cannot find a device for / (is /dev mounted?).
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ln -s /dev/sda2 /dev/root
grub2-probe /
Crisis averted.
So does anyone know why /dev/root isn't being created or why df -h shows /dev/root when it should be /dev/sda2
/etc/fstab
| Code: |
/dev/sda2 / btrfs rw,ssd,noatime,compress=lzo 0 1
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kingfame_147
Apprentice
Joined: 11 Oct 2008
Posts: 171
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| Posted: Wed Feb 01, 2012 9:29 pm Post subject: |
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I'm seeing the same issue at a new system of mine.
Using grub2, install works, but grub2-mkconfig only works with that ugly workaround "ln -s /dev/sda3 /dev/root". After a reboot the links is gone ofc. That is quite annoying. Are there any news regarding this bug?
Edit:
I switched to dracut tonight and now the problem seems to be gone. df shows /dev/sda3 insteaf of /dev/root. |
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