Re: [Qemu-discuss] Disk integrity problems

[Jakob Bohm]

On 26/02/2017 08:33, Scott Hazelhurst wrote:
> Dear all
>
> I’ve started to run into some problems with several of my machines — as it’s 
> happened on several of my physical machines acquired at different times I don’t 
> think it’s a hardware problem and running physical diagnostics doesn’t pick up 
> problems.
>
> Every week or so, one of my VMs’ root file system becomes read only. If I 
> reboot it all seems to run OK.
>
> However,
> 1. On the VM, if I do an fsck -n on root file system of the VM it reports that 
> there are errors.
Make sure you do this with the root file system mounted read
only, as otherwise, fsck may complain about the half-written
state of the file system and any (recently) open files on it.
> 2. If I shutdown the VM, and on the host machine do a kpartx -a on the 
> underlying partition, and then do an fsck -f on the VM’s disk, no errors are 
> reported.
> 3. If I boot the VM with a livedisk using the same OS as the VM guest and do an 
> fsck -n then no error is reported. (the version of fsck is the same as (1))
>
> But if I reboot up the VM and do an fsck it still reports errors.
>         
> One variant of this that when I do (2) initially some errors are picked up and 
> fixed by the fsck on the host, but after that (2) and (3) report no further 
> errors but (1) does.
>
> My set up is
>         • The VM hosts run Ubuntu 16.04 with qemu-vm  1:2.5+dfsg-5ubuntu10.9
>         • My VM guests run Scientific Linux 6.8
>         • The VM’s disk images are LVM2 logical volumes
>
> Any help would be gratefully received



Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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