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oniichan
n00b
Joined: 15 Jun 2012
Posts: 27
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 Posted: Fri Jun 15, 2012 5:04 pm Post subject: GRUB can't find disk - labeled nor dev/sda3 |
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Hi.
I have a "small" problem.
I've spent a couple of hours installing Gentoo, and I like it so far. The reason for my install is to larn more about kernels.
I have a "working" install as we speak. (very barebone)
I have 3 physical disks: One 40 gig (for Gentoo), One 500 gig (windows install+storage) and one SSD (windows OS).
I installed Gentoo with everything except the 40 gig plugged in. With three partitions (1:boot 2:swap 3:root) they got the name /dev/sda1/2/3. Not hda as expected?
Anyhow, the OS boots up just fine with only the 40gb plugged in, but when I plug in the other two drives it gives me "!! Block device /dev/disk/by-label/ROOT is not a valid root device..." after grub.
So I began looking in to it. I want to be able to boot off the drive without having to unplug the others!
As I understood, I was supposed to label the discs and refer to them as labeled in the grub config file.
I used "e2label /dev/sda3 ROOT" and "e2label /dev/sda1 BOOT" and in the grub.conf I said it to look for real_root at /dev/disk/by-label/ROOT.
The disk is there, tried mounting and going there to dir it, and it is there.
So how come GRUB doesn't find it?
Thank you very much,
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BillWho
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Joined: 03 Mar 2012
Posts: 1576
Location: US
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| Posted: Fri Jun 15, 2012 6:04 pm Post subject: |
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oniichan,
Welcome to gentoo 
Is it possible to paste back your menu.lst or grub.cgf (whatever the boot menu file is) 
And also your /etc/fstab file and the output of blkid - have all the disks plugged in for blkid
Doing it from a chroot is fine 
_________________
Good luck
Since installing gentoo, my life has become one long emerge  |
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oniichan
n00b
Joined: 15 Jun 2012
Posts: 27
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| Posted: Fri Jun 15, 2012 6:45 pm Post subject: |
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Sure!
/boot/grub/grub.conf
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default 0
timeout 30
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
#this is the working boot, but only when 1 HDD is plugged in
title Gentoo Linux (working)
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-3.2.12-gentoo real_root=/dev/sda3
initrd /boot/initramfs-genkernel-x86_64-3.2.12-gentoo
#this is something I tested
title Gentoo Linux Test
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-3.2.12-gentoo real_root=/dev/disk/by-label/ROOT
initrd /boot/initramfs-genkernel-x86_64-3.2.12-gentoo
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And yes, I labeled /dev/sda3 ROOT with "e2label /dev/XXX <label>" , in this case /dev/sda3 ROOT
My fstab:
| Code: |
/dev/sda1 /boot ext3 noauto,noatime 1 2
/dev/sda3 / ext3 noatime 0 1
/dev/sda2 none swap sw 0 0
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Can't do blkid just yet, I have some problems getting my mobo to detect the optical drive... 
EDIT: Optical drive detected, still problems getting the chroot to work.
I am in the livecd, trying to mount /dev/sda3 (root) to /mnt/gentoo, but the special device /dev/sda3 doesn't exist now all of a sudden.
EDIT again: /dev/sda3 stops existing when the other drives are plugged in. Right now I'm in the live CD, and I can mount /dev/sda3 to /mnt/gentoo.
But when the other drives are plugged in the /dev/sda3 doesn't exist and cannot be mounted!?!?!
Someone explain, I'm about to go all mad right now. |
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eccerr0r
Advocate
Joined: 01 Jul 2004
Posts: 3001
Location: USA
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| Posted: Fri Jun 15, 2012 7:29 pm Post subject: |
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I don't think /dev/ is fully populated by busybox mdev so hence the udev full path won't work.
The usual way to specify by label using the typical initrd is
root=LABEL=your-label
Looks a little funny but it works...
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Core-i7-2700K@4.1GHz/8GB RAM/180GB SSD/Intel HD3000 graphics
What the heck am I advocating? |
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oniichan
n00b
Joined: 15 Jun 2012
Posts: 27
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| Posted: Fri Jun 15, 2012 7:43 pm Post subject: |
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| eccerr0r wrote: | I don't think /dev/ is fully populated by busybox mdev so hence the udev full path won't work.
The usual way to specify by label using the typical initrd is
root=LABEL=your-label
Looks a little funny but it works... |
Thank you VERY MUCH. This did the trick. Working flawlessly. |
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BillWho
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Posts: 1576
Location: US
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| Posted: Fri Jun 15, 2012 7:46 pm Post subject: |
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oniichan,
Your first menu entry should work 
Just out of curiosity, can you post back blkid now
_________________
Good luck
Since installing gentoo, my life has become one long emerge |
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oniichan
n00b
Joined: 15 Jun 2012
Posts: 27
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| Posted: Fri Jun 15, 2012 8:24 pm Post subject: |
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| BillWho wrote: | oniichan,
Your first menu entry should work
Just out of curiosity, can you post back blkid now |
| Code: | /dev/sda1: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sda2: LABEL="SWAP" UUID="yadayada" TYPE="swap"
/dev/sda3: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sdb1 LABEL="Reserverad av systemet" UUID="shorter yadayada" TYPE="ntfs"
# Reserverad av systemet = Reserved by the system; /dev/sdb is my SSD which has windows on it #
/dev/sdb2 UUID="shorter yadayada" TYPE="ntfs"
/dev/sdc1 : LABEL="Lagring" type ntfs
/dev/sdc2 : LABEL = Installationer
# dev/sdc is my 500gb mechanical HDD for "lagring" (storage) and installations for my Windows.
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BillWho
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Joined: 03 Mar 2012
Posts: 1576
Location: US
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| Posted: Fri Jun 15, 2012 8:33 pm Post subject: |
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| oniichan wrote: | | BillWho wrote: | oniichan,
Your first menu entry should work
Just out of curiosity, can you post back blkid now |
| Code: | /dev/sda1: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sda2: LABEL="SWAP" UUID="yadayada" TYPE="swap"
/dev/sda3: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sdb1 LABEL="Reserverad av systemet" UUID="shorter yadayada" TYPE="ntfs"
# Reserverad av systemet = Reserved by the system; /dev/sdb is my SSD which has windows on it #
/dev/sdb2 UUID="shorter yadayada" TYPE="ntfs"
/dev/sdc1 : LABEL="Lagring" type ntfs
/dev/sdc2 : LABEL = Installationer
# dev/sdc is my 500gb mechanical HDD for "lagring" (storage) and installations for my Windows.
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[/code] |
I see two 'BOOT' - no ROOT Also UUID="yadayada" is a problem
_________________
Good luck
Since installing gentoo, my life has become one long emerge |
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oniichan
n00b
Joined: 15 Jun 2012
Posts: 27
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| Posted: Fri Jun 15, 2012 8:46 pm Post subject: |
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| BillWho wrote: | | oniichan wrote: | | BillWho wrote: | oniichan,
Your first menu entry should work
Just out of curiosity, can you post back blkid now |
| Code: | /dev/sda1: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sda2: LABEL="SWAP" UUID="yadayada" TYPE="swap"
/dev/sda3: LABEL="BOOT" UUID="yadayada" TYPE="ext3"
/dev/sdb1 LABEL="Reserverad av systemet" UUID="shorter yadayada" TYPE="ntfs"
# Reserverad av systemet = Reserved by the system; /dev/sdb is my SSD which has windows on it #
/dev/sdb2 UUID="shorter yadayada" TYPE="ntfs"
/dev/sdc1 : LABEL="Lagring" type ntfs
/dev/sdc2 : LABEL = Installationer
# dev/sdc is my 500gb mechanical HDD for "lagring" (storage) and installations for my Windows.
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I see two 'BOOT' - no ROOT Also UUID="yadayada" is a problem |
One of them is a typo.
And I was to lazy to write the full UUIDs. I knew they looked correct. |
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eccerr0r
Advocate
Joined: 01 Jul 2004
Posts: 3001
Location: USA
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| Posted: Fri Jun 15, 2012 10:11 pm Post subject: |
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For future reference, people with typical initrd's can also do real_root=UUID="yadayada" as well to specify Linux disks.
Though UUID is a bit ugly in my books. I just use labels.
_________________
Core-i7-2700K@4.1GHz/8GB RAM/180GB SSD/Intel HD3000 graphics
What the heck am I advocating? |
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Installing Gentoo
