[CentOS] KVM on CentOS 6

m.roth at 5-cent.us m.roth at 5-cent.us
Thu Sep 8 17:34:10 UTC 2011


Emmett Culley wrote:
> On 09/08/2011 09:07 AM, m.roth at 5-cent.us wrote:
>> Emmett Culley wrote:
>>> On 09/08/2011 02:25 AM, Nick wrote:
>>>> On 08/09/11 07:23, Emmett Culley wrote:
>>>>> Today I suddenly have two VMs that have read only file systems.  The
>>>>> host is CentOS 6, as are the two VMs with this problem.
<snip>
>>> the one that is still available.  The last lines of syslog
>>> (/var/log/messages) are:
>> <snip>
>>> Sep  7 21:59:23 dev kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr
>>> 0x0
>>> action 0x6 frozen
>>> Sep  7 21:59:23 dev kernel: ata1.00: failed command: WRITE DMA
>>> Sep  7 21:59:23 dev kernel: ata1.00: cmd
>>> ca/00:08:a0:02:31/00:00:00:00:00/e3 tag 0 dma 4096 out
>>> Sep  7 21:59:23 dev kernel:         res
>>> 40/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
>>> Sep  7 21:59:23 dev kernel: ata1.00: status: { DRDY }
>>> Sep  7 21:59:23 dev kernel: ata1: soft resetting link
>>> Sep  7 21:59:23 dev kernel: ata1.00: configured for MWDMA2
>>> Sep  7 21:59:23 dev kernel: ata1.00: device reported invalid CHS sector
>>> 0
>>> Sep  7 21:59:23 dev kernel: ata1: EH complete
>> <snip>
>> Bad news, IMO: I think you have a hardware problem - looks like sector 0
>> of your h/d has gone bad.
>>
>> Got backups? Got spare drive?
>>
> Except that this "hardware" is on the guest and so is virtual.  The image
> is actually a LVM logical volume.  So, it must be either a kvm/qemu or a
> kernel bug.  I am working on getting a bug reported, as soon as I figure
> out where to report it.

Are you sure that the host o/s isn't passing a real error up? Are there
errors in the host's logfile?

         mark




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