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Re: [Xen-users] HVM domU doesnt start

To: Alberto Asuero Arroyo <albertoasuero@xxxxxxxxx>
Subject: Re: [Xen-users] HVM domU doesnt start
From: Todd Deshane <todd.deshane@xxxxxxx>
Date: Tue, 15 Feb 2011 14:11:24 +0000
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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On Tue, Feb 15, 2011 at 7:57 AM, Alberto Asuero Arroyo
<albertoasuero@xxxxxxxxx> wrote:
> Hello!
> I've a ubuntu server running over a HVM DomU. After a hang, the domU doesn't
> start again.
> The domU was not able to mount the virtual machine disk so I started with a
> live cd and I tried to mount the disk root part / with no success so I ran
> fsck.ext3 and it gave me input/output error in the domU and in dom0 the
> kernel says:
> Feb 14 18:22:28 scofield last message repeated 5 times
> Feb 14 18:22:30 scofield kernel: sd 0:2:3:0: [sdd] Unhandled error code
> Feb 14 18:22:30 scofield kernel: sd 0:2:3:0: [sdd] Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK
> Feb 14 18:22:30 scofield kernel: end_request: I/O error, dev sdd, sector
> 1073919
> Feb 14 18:22:30 scofield Server Administrator: Storage Service EventID:
> 2095  SCSI sense data Sense key:  3 Sense code: 11 Sense qualifier:  0:
> Physical Disk 0:0:3 Controller 0, Connector 0
> Other important think was that in domU with live CD I could mount other
> partitions of the disk with no errors but not the root partition.
> The first think I thought it was a hard disk problem, so I tried to copy the
> img to another hard disk in my dom0 but input /output erros was reported.
> After that I've reinstalled the machine on the same hard disk and it works
> perfectly.
> How is it possible? Could a corrupt image make impossible copy it? I've had
> this problem twice and I've to reinstalled the machine.

file system corruption can happen with improper shutdowns or when the
file system is mounted writable twice without the support of a
clustered or network file system.

Your dd commands seem fine.

I think that your file system was corrupt on the disk image and yes
copying a corrupt disk image would still leave the file system

> Maybe I'm doing something wrong create the image with dd. I use the
> following command for a image of 900GB
> dd if=/dev/zero of=file900G.img bs=1M count=921600
> I cant remember very well, but I think the issue is because I created a
> image with dd bigger than hard disk size, If I do it dd command doesnt says
> nothing, let's to see that.
> # df -h
>                            Size    Used  Avail   Use     Mounted on
> /dev/sdd1             917G  1,7G  869G   1%
> /vserver/images/domains/mahone
> Let's create a image of 900GB it should be report errors but NO errors are
> reported!!
> # dd if=/dev/zero of=/vserver/images/domains/mahone/mahone.img bs=1M
> count=921600
> 921600+0 records in
> 921600+0 records out
> 966367641600 bytes (966 GB) copied, 26901,7 s, 35,9 MB/s
> # df -h
>                            Size    Used  Avail   Use       Mounted on
> /dev/sdd1             917G  902G     0      100%
> /vserver/images/domains/mahone
> Thanks in advance
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