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mrmylanman
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Joined: 21 Apr 2012
Posts: 19
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 Posted: Sat Apr 21, 2012 10:33 pm Post subject: [SOLVED] Block device is not a valid root device on boot |
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This is my grub.cfg:
| Code: | default 0
timeout 3
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title Gentoo Linux
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-3.2.12-gentoo root=/dev/ram0 real_root=/dev/sdb2 real_rootfstype=btrfs real_pcie_aspm=force
initrd /boot/initramfs-genkernel-x86_64-3.2.12-gentoo |
This is the output of fdisk -l:
| Code: | Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimum): 512 bytes / 512 bytes
Disk identifier: 0x00033464
Device Boot Start End Blocks Id System
/dev/sda1 2048 439453695 219725824 83 Linux
/dev/sda2 439453696 488396799 24471552 83 Linux
Disk /dev/sda: 60.0 GB, 60022480896 bytes
255 heads, 63 sectors/track, 7296 cylinders, total 117231408 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimum): 512 bytes / 512 bytes
Disk identifier: 0x00017bc3
Device Boot Start End Blocks Id System
/dev/sdb1 2048 499711 248832 83 Linux
/dev/sdb2 499712 117229567 58364928 83 Linux |
This is my fstab:
| Code: | /dev/sdb1 /boot ext3 defaults,noatime
/dev/sdb2 / btrfs defaults,noatime,ssd,compress=lzo
/dev/sda1 /home btrfs defaults,noatime
/dev/sda2 /var btrfs defaults,noatime
proc /proc proc defaults
shm /dev/shm tmpfs defaults,nodev,nosuid,noexec |
I have found a few threads related to seemingly similar issues, however I was unable to find a solution that helped me out. This is my first (fresh) install of Gentoo. When I boot up, I get the following error:
| Code: | >> Loading modules
>> Hint: Use parameter scandelay[=seconds] if you need waiting here
>> Activating mdev
>> Determining root device...
!! Block device /dev/sdb2 is not a valid root device...
!! Could not find the root block device in .
Please specify another value or: press Enter for the same, type "shell" for a shell, or "q" to skip...
root block device() :: |
I tried telling it /dev/sda2 and /dev/sdb2 (in case the names changed at boot-up), but neither worked (same error).
I then tried telling it /dev/ram0, and I get the following error:
| Code: | >> Mounting root...
>> Using mount -t auto -o ro
mount: mounting /dev/ram0 on /newroot failed: Invalid argument
!! could not mount specified ROOT, try again
!! Could not find the root block device in .
Please specify another value or: press Enter for the same, type "shell" for a shell, or "q" to skip...
root block device() :: |
I don't see sda, sda1, sda2, sdb, sdb1, or sdb2 in /dev when I go into the shell.
I believe I selected all the correct drivers when compiling my kernel (being sure to select Y not M), although I could be wrong.
Any help would be greatly appreciated. Thanks!
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Last edited by mrmylanman on Sun Apr 22, 2012 5:44 pm; edited 1 time in total |
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BillWho
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Joined: 03 Mar 2012
Posts: 1600
Location: US
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| Posted: Sun Apr 22, 2012 12:44 am Post subject: |
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mrmylanman,
give this a try
| Code: | title Gentoo Linux
root (hd0,0)
kernel /kernel-genkernel-x86_64-3.2.12-gentoo root=/dev/ram0 real_root=/dev/sdb2 rootfstype=btrfs pcie_aspm=force
initrd /initramfs-genkernel-x86_64-3.2.12-gentoo
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Since installing gentoo, my life has become one long emerge  |
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mrmylanman
n00b
Joined: 21 Apr 2012
Posts: 19
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| Posted: Sun Apr 22, 2012 12:53 am Post subject: |
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| BillWho wrote: | mrmylanman,
give this a try
| Code: | title Gentoo Linux
root (hd0,0)
kernel /kernel-genkernel-x86_64-3.2.12-gentoo root=/dev/ram0 real_root=/dev/sdb2 rootfstype=btrfs pcie_aspm=force
initrd /initramfs-genkernel-x86_64-3.2.12-gentoo
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Thanks so much for the tip, unfortunately I accidentally deleted a ton of files on / just now.... (can't believe it, first time I have done that, at least it was before the system was even booting properly). So I'll work on re-installing Gentoo and if I come across this problem again I will check out your answer and let you know if it helps!
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_SerEga_
n00b
Joined: 13 Jun 2009
Posts: 30
Location: Gatchina, Russia
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| Posted: Sun Apr 22, 2012 7:17 am Post subject: Re: Block device is not a valid root device on boot |
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| mrmylanman wrote: | | I don't see sda, sda1, sda2, sdb, sdb1, or sdb2 in /dev when I go into the shell. |
If you have none /dev/sd* that's means: kernel don't have driver to your SATA/IDE controller. Check /dev/hd*
Anyway, you don't need to reinstall Gentoo, only rebuild kernel. |
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cach0rr0
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Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Sun Apr 22, 2012 7:27 am Post subject: |
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does root on btrfs actually work properly without a specific initramfs?
it's possible genkernel's initramfs creation handles this
but i think because of what's involved with btrfs volume activation it'd be a non-starter as a rootfs unless an initramfs does the job of setting it up. I could be dead flat embarrassingly wrong on that, though (and that's unrelated to your missing block device issue). As per usual on my post-saturday-night-pub foruming I get thoughts a touch mixed up, I could have my recollection of subvolume support mixed with plain old rootfs requirements.
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mrmylanman
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Joined: 21 Apr 2012
Posts: 19
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| Posted: Sun Apr 22, 2012 12:37 pm Post subject: |
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I just now got around to reinstalling Gentoo and got back to where I was last night.
I tried the GRUB configuration you specified, and here's the error I run into:
| Code: | >> Activating mdev
>> Determining root device...
>> Mounting root...
>> Using mount -t btrs -o ro
mount: mounting /dev/sdb2 on /newroot failed: No such device
!! Could not mount specified ROOT, try again
!! Could not find the root block device in .
Please specify another value or: press Enter for the same, type "shell" for a shell, or "q" to skip...
root block device() :: |
The difference this time, is that /dev/sdb2 IS indeed there. So now there's something else going on.
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BillWho
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Posts: 1600
Location: US
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| Posted: Sun Apr 22, 2012 4:16 pm Post subject: |
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mrmylanman,
I'm inclined to suspect that its the btrs file system. I always use ext3 for mine.
According to the description, it's currently experimental/unstable at this time.
If there's no specific reason for using btrs, I would suggest reverting to ext3 or ext4.
cach0rr0 has also alluded to the possibility that btrfs might be a bad choice for the / file system.
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Since installing gentoo, my life has become one long emerge |
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mrmylanman
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Joined: 21 Apr 2012
Posts: 19
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| Posted: Sun Apr 22, 2012 5:43 pm Post subject: |
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I gotcha. I have read that btrfs is now considered stable, however upon further inspection, that is the version included with Linux 3.3 or 3.4 (in the installation media, it is 3.2).
Thanks for the help, however I appreciate it!
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Mon Apr 23, 2012 2:09 am Post subject: |
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i dont think the versioning is what's hurting you on this one
i think it's simply either:
a)something missing with the way that genkernel is crafting your kernel/initramfs - something missing from one or both
or
b)something in the rc system that's failing to make the necessary changes to your btrfs root volume to allow it to remount 'rw'
you actually arent at all far off from getting this to work (on your second go, i mean)
the initial mounting of root 'ro' apparently was successful, since it got to the point of entering openrc
but the subsequent attempt to mount root as rw failed
which would say to me that some btrfs action in the rc system never took place (theory B above). Maybe you're missing btrfsprogs? Maybe you're using newer udev and /usr is on a separate partition hence making btrfsctl or some other program udev might use unavailable for remounting your rootfs in 'rw' mode?
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mrmylanman
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Joined: 21 Apr 2012
Posts: 19
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| Posted: Fri May 04, 2012 3:06 am Post subject: |
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Hey guys,
Sorry it took so long to get back... I didn't really have time to mess with it for a while between work, and my wife being pregnant (and trying to finish up college!) but I finally took another whack at it.
This time I used ext4, and it was MUCH less painful. I also set up the partition map to be simpler (/boot, /, and /home), so that combination seems to work out nice. Time to emerge gnome and check back in the morning! At least now it's booting up just fine.
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Installing Gentoo
