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Could not mount specified ROOT partition. How to rescue sys?
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Mati
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Joined: 02 Sep 2008
Posts: 111

PostPosted: Fri Oct 26, 2012 4:31 pm    Post subject: Could not mount specified ROOT partition. How to rescue sys? Reply with quote

Hi there,

first my system yesterday started to have strange I/O problems, afterwards no process could be instantiated, afterwards only a reboot was possible and
now the system complains with
Code:

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, tpye 'shell' ...


Nothing works anymore.

I used gparted to repair the xfs filesystem but it immediately complains with an error:
Code:

The filesystem has valuable metadata changes in a log which needs to
be replayed.  Mount the filesystem to replay the log, and unmo...


i think the root partition is somehow defect, maybe the hard disk (its a notebook) is not working anymore.

How can i rescue the system or get it again to run? Which information do you need?

Thanks for any help
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NeddySeagoon
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PostPosted: Fri Oct 26, 2012 6:14 pm    Post subject: Reply with quote

Mati,

If this system used to work and you have done nothing, its has suffered a hardware failure.
It may be the HDD or the motherboard.
The line
Code:
Could not find the root block device in .
should list all the block devices that the kernel can see.
In this case none.

If you have just made a new kernel, its missing the some code for your HDD controller on the motherboard.

What does lspci say. Has your HDD controller vanished from there?
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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Hypnos
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PostPosted: Fri Oct 26, 2012 9:13 pm    Post subject: Reply with quote

Booting with sysrescuecd maybe useful here, to check the state of your hardware with a known "good" setup. Follow Neddy's suggestions from there.
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Mati
Tux's lil' helper
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Joined: 02 Sep 2008
Posts: 111

PostPosted: Mon Oct 29, 2012 9:54 am    Post subject: Reply with quote

Hi,

Quote:
If this system used to work and you have done nothing, its has suffered a hardware failure.


Might be yes, but im not 100% sure. In fact, i did nothing - so you might be right.

Quote:
should list all the block devices that the kernel can see.
In this case none.


correct yes.

Quote:
If you have just made a new kernel, its missing the some code for your HDD controller on the motherboard.


i did nothing, no kernel rebuild, no emerge.

Quote:
What does lspci say.


It says:

Code:

/bin/ash: lspci: not found


Anyway, i'm looking forward to any further help.

Thanks a lot!
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NeddySeagoon
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PostPosted: Mon Oct 29, 2012 7:40 pm    Post subject: Reply with quote

Mati,

Boot with a CD. SystemRescueCD is good but any liveCD will do. See if you can find your disk drives at all.
If they are there, try to mount the partitions - do you get any errors?

If the drives are missing, can you see the hard drive controller in the lspci output?

Did you do something thats easy to overlook - like leaving some USB storage connected?
This often causes the HDDs to be reordered.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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Mati
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Joined: 02 Sep 2008
Posts: 111

PostPosted: Mon Nov 05, 2012 9:39 am    Post subject: Reply with quote

xfs_repair fixed the problem (from sysrescuecd). Seems that some inodes where mislinked...

thanks for help and suggestions.
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