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chol.nhial
n00b
Joined: 07 Oct 2015
Posts: 3
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 Posted: Wed Oct 07, 2015 7:30 am Post subject: Kernel panic on boot |
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Hi all,
I moved my hard drive on to my new computer and was hoping that it would boot up as usual, but I got otherwise. I got a kernel panic saying that /dev/sda3 could not be found. Please help me on this. |
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Logicien
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Joined: 16 Sep 2005
Posts: 1555
Location: Montréal
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| Posted: Wed Oct 07, 2015 7:48 am Post subject: |
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Hi,
the moved hard drive can have an other device file name than sda, specially if there is an other hard drive in the new computer. The moved one may be sdb or have an higher letter. If the kernel have the parameter root=/dev/sda3 and it is in fact /dev/sdb3 on the new computer, there will be a kernel panic because Linux can't find it's root files system where it is.
You need to pass the root=/dev/sdb3 parameter to the kernel or any other place where is the Gentoo root files system to resolv this problem and ajust too the /etc/fstab file to the new situation. Note that if the kernel do not have what it need to boot on the new computer, you will have other problems.
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Paul |
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Roman_Gruber
Advocate
Joined: 03 Oct 2006
Posts: 3846
Location: Austro Bavaria
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| Posted: Wed Oct 07, 2015 8:36 am Post subject: |
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You need to build a kernel for the new box. also check your partition table and your bootloader parameters
For sure the hdd controller is different and a few other things. or use a genkernel kernel
you may downloand systemrescuecd and burn it to a disc. than chroot from that into your box and build the kernel than (assuming the architecture is compatible)
| Code: | eix systemresc
[I] app-admin/systemrescuecd-x86
Available versions:
(4.4.1) (~)4.4.1^m
(4.5.0) (~)4.5.0^m
(4.5.1) (~)4.5.1^m
(4.5.2) (~)4.5.2^m
(4.5.3) (~)4.5.3^m
(4.5.4) (~)4.5.4^m
(4.6.0) (~)4.6.0^m
Installed versions: 4.6.0(4.6.0)^m(14:45:55 03.10.2015)
Homepage: http://www.sysresccd.org/
Description: The .iso image of SystemRescueCD rescue disk, x86 (+ amd64) variant
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chol.nhial
n00b
Joined: 07 Oct 2015
Posts: 3
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| Posted: Sun Oct 11, 2015 10:27 am Post subject: |
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| I've recompiled the kernel but I still get the kernel panic. "VFS: Cannot open root device "sdb3" or unknown-block(0,0)" |
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Buffoon
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Joined: 17 Jun 2015
Posts: 1369
Location: EU or US
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| Posted: Sun Oct 11, 2015 11:25 am Post subject: |
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| So how many drives you have in this box? |
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chol.nhial
n00b
Joined: 07 Oct 2015
Posts: 3
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| Posted: Mon Oct 12, 2015 1:40 am Post subject: |
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| About 3. |
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Buffoon
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Joined: 17 Jun 2015
Posts: 1369
Location: EU or US
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| Posted: Mon Oct 12, 2015 2:42 am Post subject: |
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| Probably the drives are reordered. |
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Installing Gentoo
