Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

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milindras
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Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

Post by milindras » 2013/02/16 16:10:16

Hi,

This machine is a Virtual machines on VMWARE ESX. This guest OS is not strating up after a POWER CRASH to the server. Its just straight away going to the following message on the black screen.

Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

The OS is CentOS 5.5 64 bit.

Its a live web server & I am trying to make it up since yesterday without sleep but no luck!!

I booted up from an ISOimage to the rescue mode, but quite not sure what to do.

Please assist me to resolve the problem.

Thank you inadvance.

Kind Regards
Mili[img]Libraries\Pictures\Error.png[/img]

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TrevorH
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Kernal Panic - Not syncing : VFS: unable to mount root fs on

Post by TrevorH » 2013/02/16 23:49:31

Can you choose an older kernel from the list presented by the grub menu at first boot if you hit Esc to interrupt it?

milindras
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Re: Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

Post by milindras » 2013/02/17 09:56:11

Hi,
Thanks for the reply.
It doesnt give that options. When I press ESC, it giving me a boot menu.

One this I noticed that before I get the kernal panic error I was this error

error: no such disk & then the kernal panic error.

Thanks

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TrevorH
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Re: Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

Post by TrevorH » 2013/02/17 12:45:26

Did you change anything from the VMWare side of things? Did you update your CentOS system recently and not reboot afterwards? Can you boot from the install CD/DVD in rescue mode and see if the hard disks are seen correctly? If so, can you run fsck against the various volumes?

cstacy
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Re: Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

Post by cstacy » 2013/03/04 22:22:34

I am having this same panic. Using VMWARE Fusion I did a "yum update" which finished and dumped a new kernel. I thought I booted into it without problem. But after a normal CentOS shutdown and host reboot, I get this same panic!

I can boot into the previous kernel without any problem.

What can I do to get this new kernel to work? The same fs works fine when I boot into 2.6.32-279.11.1.e16.x86_64.

Perhaps it is relevant that the initramfs for the losing system is zero length, unlike all the other ones.

cstacy
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Re: Kernal Panic - Not syncing : VFS: unable to mount root fs on unknown-block (0,0)

Post by cstacy » 2013/03/04 23:01:09

I did a "yum remove kernel-2.6.32-279.22.1.el6" and another "yum update" to re-install the kernel.
It completed normally.
I shut down, rebooted the VMWARE host, and was able to start the CentOS machine without problems.

No idea how the installation failed or was zapped the first time, but doing it again seems to work.
Hopefully no underwear gnomes will assault my files now...

georggg
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Joined: 2013/11/30 20:14:23

Re: Kernal Panic - Not syncing : VFS: unable to mount root f

Post by georggg » 2013/11/30 20:15:28

Same here, works, thx

BooRoNiC
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Joined: 2015/02/05 15:33:57

Re: Kernal Panic - Not syncing : VFS: unable to mount root f

Post by BooRoNiC » 2015/02/05 15:40:27

Hello,

I got same error CentOS 7 on VMESXi 5.5.0.

Code: Select all

yum remove kernel

Code: Select all

yum update
commands solve this problem.
Thanks a lot cstacy

Best regards.

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