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maverick6664
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Joined: 13 May 2005
Posts: 413
Location: Tokyo / Japan
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 Posted: Thu Aug 07, 2008 7:06 pm Post subject: How to recover from crash...[solved] |
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I encountered power down twice today. Then Gentoo became very very slow; it took 30min to boot. How can I fix it? and what is the problem? One thing I noticed after crash was cmos memory was broken.
Now due to my fault, mbr is broken and I need to write mbr with grub. Any idea? Somehow livecd 2008.0 doesn't boot...... 
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Tetsuji Rai
a.k.a. Lukiest in the world
Last edited by maverick6664 on Fri Aug 08, 2008 2:53 am; edited 1 time in total |
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Clad in Sky
l33t
Joined: 04 May 2007
Posts: 888
Location: Germany
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| Posted: Thu Aug 07, 2008 7:14 pm Post subject: |
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Using the minimal CD instead of the live cd might be a good idea.
Boot up with that CD, then
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mount /dev/[your harddrive - hdaX or sdaX] mnt/gentoo
mount -t proc proc proc
mount -o bind /dev dev
chroot . /bin/bash
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You should then be able to rewrite your mbr. Since you mentioned GRUB which I do not use I cannot help there. The Gentoo Handbook says:
Default: Setting up GRUB using grub-install
To install GRUB you will need to issue the grub-install command. However, grub-install won't work off-the-shelf since we are inside a chrooted environment. We need to create /etc/mtab which lists all mounted filesystems. Fortunately, there is an easy way to accomplish this - just copy over /proc/mounts to /etc/mtab, excluding the rootfs line if you haven't created a separate boot partition. The following command will work in both cases:
Code Listing 2.5: Creating /etc/mtab
# grep -v rootfs /proc/mounts > /etc/mtab
Now we can install GRUB using grub-install:
Code Listing 2.6: Running grub-install
# grub-install --no-floppy /dev/sda
If you have more questions regarding GRUB, please consult the GRUB FAQ or the GRUB Manual.
Continue with Rebooting the System.
Hope this helps
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maverick6664
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Joined: 13 May 2005
Posts: 413
Location: Tokyo / Japan
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| Posted: Fri Aug 08, 2008 2:43 am Post subject: |
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Thank you for your advice. But I didn't have to do that.
As I wrote before I had suspected cmos (as bios said the checksum was wrong). So I had set it to "Load to failsafe value" and it has recovered.
Thank you very much. But I still don't know where in cmos was wrong....
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Tetsuji Rai
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Installing Gentoo
