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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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 Posted: Sun Jun 24, 2012 11:21 pm Post subject: grub error |
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Hi,
I've completed what seems like a good install of the 20120621 amd 64 minimal. When I reboot I get a grub error 22, "no such partition".
I am installing it on my usb external drive SDB. Because my internal drive is not working properly, I decided to write grub not to the MBR but to the usb drive. My usb drive is divided up as such:
sdb1 - swap
sdb2 - root
sdb3 - most of my important data - not involved in the installation
sdb4 - boot
This is my grub.conf file:
default 0
timeout 30
#splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title Gentoo Linux 3
root (hd1,3)
kernel /boot/kernel-3 root=/dev/ram0 real_root=/dev/sdb2
******
I am a little uncertain when to indicate my boot or root partition....maybe this is the problem.
Cheers
Richard |
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BillWho
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Joined: 03 Mar 2012
Posts: 1576
Location: US
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| Posted: Sun Jun 24, 2012 11:50 pm Post subject: |
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rekonrad,
Try
| Code: | title Gentoo Linux 3
root (hd1,3)
kernel /kernel-3 root=/dev/sdb2 rootfstype=ext3 |
Change rootfstype= to the correct file system if it's not ext3
Good luck 
_________________
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Since installing gentoo, my life has become one long emerge  |
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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Mon Jun 25, 2012 5:04 am Post subject: Grub error |
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In the grub.conf, there are comments about what "root"
means. It says "the partition that has the disk image".my understanding
is the bzimage is on the boot partition but I understand root to
mean operating system. Maybe I should have put root as my true root which is
hda 1, 1. |
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Deathwing00
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Joined: 13 Jun 2003
Posts: 4074
Location: Barcelona, Spain
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| Posted: Mon Jun 25, 2012 10:20 pm Post subject: Re: Grub error |
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| rekonrad wrote: | In the grub.conf, there are comments about what "root"
means. It says "the partition that has the disk image".my understanding
is the bzimage is on the boot partition but I understand root to
mean operating system. Maybe I should have put root as my true root which is
hda 1, 1. |
That is correct.
* root (X, Y) is the partition in which you have the grub files.
* The kernel parameter root=/dev/XdYZ is the root partition of your entire system. |
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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 12:14 am Post subject: grub error |
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This is my grub.conf file. The only change I made was the addition of "rootfstype=ext3"
When I setup grub I selected:
grub> root (hd1,3) which is where my /boot partition resides
grub>setup (hd1) where I want to install grub (not MBR). This is my external usb drive
default 0
timeout 30
#splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title Gentoo Linux 3
root (hd1,3)
kernel /boot/kernel-3 root=/dev/ram0 real_root=/dev/sdb2 rootfstype=ext3
When I boot up and select gentoo linux 3, I get root (hd1,3) Error 22: no such partition
Any ideas where I can go from here? |
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BillWho
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Posts: 1576
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| Posted: Tue Jun 26, 2012 12:38 am Post subject: |
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did you try kernel /kernel-3 root=/dev/sdb2 rootfstype=ext3 
Since /boot is on its own partition, there's no need to precede /kernal with /boot
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Since installing gentoo, my life has become one long emerge |
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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 1:38 am Post subject: grub error |
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I made the change (mounted via another linux system). I got the same message when I tried to boot. (root (hd1,3) Error 22: No such partition.
Is it ok to "setup (hd1)? I know the MBR is usually recommended (hd0) but as I said, my internal hard drive is corrupted.
Richard |
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BillWho
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| Posted: Tue Jun 26, 2012 2:27 am Post subject: Re: grub error |
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| rekonrad wrote: | | Is it ok to "setup (hd1)? I know the MBR is usually recommended (hd0) but as I said, my internal hard drive is corrupted. |
I've never installed any linux on an external hd, but others I know have. I'm pretty sure you can install grub to the external (not a partition) as long as you can select to boot it from your bios.
Get to the grub prompt and try
find /boot/grub/stage1
It should return (hd?,?) where the '?' will have actual values.
Then
root (hd?,?)
setup (hd1)
quit
If that doesn't work then try installing grub to hd0 - it probably can't hurt at this point if it's not working properly now.
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Since installing gentoo, my life has become one long emerge |
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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 3:24 am Post subject: grub |
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Thanks for the info. I did the /find command and verified hd1,3 was correct so I decided to setup on MBR and I got it to boot kinda.......I ended up with Kernel panic and here are some of the messages as it quit:
List of all partitions:
0800 78150744 sda ddriver : sd
0801 78140128 sda1 000000(lots of 0's)
0802 1024 sda2
no filesystem could mount root,tried ext3
kernel panic - not syncing: VFS Unable to mount root fs on unknown-blcik (1,0)
If the issue is my bad sda, can I boot my system from a cd rather than from grub (or lilo)? |
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BillWho
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Posts: 1576
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| Posted: Tue Jun 26, 2012 4:13 am Post subject: Re: grub |
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| rekonrad wrote: | | Thanks for the info. I did the /find command and verified hd1,3 was correct so I decided to setup on MBR and I got it to boot kinda.......I ended up with Kernel panic |
That's a lot further than you ever got before  That's actually a good sign
Can you boot a live cd, mount your '/' and /boot partition and paste your grub.conf, fstab file and the output of blkid
As far as creating and booting from a cd, I don't think that will work until you get gentoo to boot. The method would be something like this
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Since installing gentoo, my life has become one long emerge |
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rekonrad
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Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 4:47 am Post subject: grub |
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Nice to have your help - thanks again
Here is what you requested:
fstab
# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/sdb4 /boot ext2 noauto,noatime 1 2
/dev/sdb2 / ext3 noatime 0 1
/dev/sdb1 none swap sw 0 0
/dev/cdrom /mnt/cdrom auto noauto,ro 0 0
#/dev/fd0 /mnt/floppy auto noauto 0 0
________________________________________
grub.conf
default 0
timeout 30
#splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title Gentoo Linux 3
root (hd1,3)
kernel /kernel-3 root=/dev/ram0 real_root=/dev/sdb2 rootfstype=ext3
#initrd /boot/initramfs-genkernel-x86-2.6.24-gentoo-r5
# vim:ft=conf:
Output of blkid
/dev/sdb1: UUID="bc8f72d0-c3a0-494e-b373-35cd236ea4ab" TYPE="swap"
/dev/sdb2: UUID="096abccf-d85e-421b-b9f2-c11782ed5238" TYPE="ext3"
/dev/sdb3: UUID="16542395-a826-4d1c-b1b9-d6d7d99713ee" TYPE="ext4"
/dev/sdb4: UUID="05b01752-32ad-4654-b905-be26163bbc75" TYPE="ext2" |
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BillWho
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| Posted: Tue Jun 26, 2012 5:01 am Post subject: |
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| Quote: | | kernel /kernel-3 root=/dev/ram0 real_root=/dev/sdb2 rootfstype=ext3 |
Since you're not using a initramfs the root= is looking in the wrong place
| Code: | | kernel /kernel-3 root=/dev/sdb2 rootfstype=ext3 |
should boot this thing 
The only thing it's complaining about is not finding your filesystem 
| Quote: | no filesystem could mount root,tried ext3
kernel panic - not syncing: VFS Unable to mount root fs on unknown-blcik (1,0)
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Since installing gentoo, my life has become one long emerge |
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rekonrad
Apprentice
Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 5:23 am Post subject: grub |
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I did as you instructed....but still got kernel panic only it complained of the unknown blk (0,0) and not (1,0) as before. Also, I did the fix by mounting my sdb4 via another linux system and writing the change. Hope permissions in not a factor.
Richard |
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BillWho
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Location: US
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| Posted: Tue Jun 26, 2012 1:18 pm Post subject: Re: grub |
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| rekonrad wrote: | | I did as you instructed....but still got kernel panic only it complained of the unknown blk (0,0) and not (1,0) as before. Also, I did the fix by mounting my sdb4 via another linux system and writing the change. Hope permissions in not a factor. |
I had high hopes for that last modification  The way you made the modifications shouldn't mess anything up.
I don't know if you set your filesystem in .config, but check that ext2 and 3 are built into the kernel.
<*> Second extended fs support │ │
│ │ [ ] Ext2 extended attributes │ │
│ │ [ ] Ext2 execute in place support │ │
│ │ <*> Ext3 journalling file system support │ │
│ │ [ ] Default to 'data=ordered' in ext3 │ │
│ │ [*] Ext3 extended attributes │ │
│ │ [*] Ext3 POSIX Access Control Lists │ │
│ │ [*] Ext3 Security Labels │ │
│ │ <*> The Extended 4 (ext4) filesystem │ │
│ │ [*] Ext4 extended attributes │ │
│ │
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 29963
Location: 56N 3W
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| Posted: Tue Jun 26, 2012 1:31 pm Post subject: |
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rekonrad,
You need a kernel parameter The problem with root on USB is that the kernel tries to mount root before it starts USB,
so it never finds root. rootdelay=<sec> tells the kernel to pause before attempting to mount root. During the pause, USB becomes ready.
Values of rootdelay betwee 7 and 30 are know to work. You can fine tune it if you like.
A couple of other gotchyas. USB and USB storage must be built in, not modules.
Some BIOSes call the boot drive (hd0) no matter where it is. Thats a trial and error thing unfortunately.
| Code: | | kernel /kernel-3 root=/dev/sdb2 rootdelay=7 |
should do nicely. The rootfstype=ext3 should not be needed.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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rekonrad
Apprentice
Joined: 01 Jun 2003
Posts: 176
Location: Winnipeg, MB
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| Posted: Tue Jun 26, 2012 2:23 pm Post subject: (SOLVED.) grub error |
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Indeed it worked! Now to setup grub back on sdb....
Thanks to all!
Richard |
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Installing Gentoo
