[Linux-cluster] The file on a GFS2-filesystem seems to be corrupted

[Steven Whitehouse]

Hi,

How did you generate the image in the first place? I don't know if we've 
ever really tested GFS2 with a qcow device underneath it - normally even 
in virt clusters the storage for GFS2 would be a real shared block 
device. Was this perhaps just a single node?

Have you checked the image with fsck.gfs2 ?

Steve.

On 15/12/14 09:17, Vladimir Melnik wrote:
> And one more question,
>
> Is it safe to remove this file? What will happen if I try to run 'rm
> /mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak', won't it corrupt
> other files?
>
> Thanks.
>
> On Sat, Dec 13, 2014 at 06:04:48PM +0200, Vladimir Melnik wrote:
>> Dear colleagues,
>>
>> I encountered some very strange issue and would be grateful if you share
>> your thoughts on that.
>>
>> I have a qcow2-image that is located at gfs2 filesystem on a cluster.
>> The cluster works fine and there are dozens of other qcow2-images, but,
>> as I can see, one of images seems to be corrupted.
>>
>> First of all, it has quite unusual size:
>>> stat /mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak
>>    File: `/mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak'
>>    Size: 7493992262336241664     Blocks: 821710640  IO Block: 4096   regular file
>> Device: fd06h/64774d    Inode: 220986752   Links: 1
>> Access: (0744/-rwxr--r--)  Uid: (    0/    root)   Gid: (    0/    root)
>> Access: 2014-10-09 16:25:24.864877839 +0300
>> Modify: 2014-12-13 14:41:29.335603509 +0200
>> Change: 2014-12-13 15:52:35.986888549 +0200
>>
>> By the way, I noticed that blocks' number looks rather okay.
>>
>> Also qemu-img can't recognize it as an image:
>>> qemu-img info /mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak
>> image: /mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak
>> file format: raw
>> virtual size: 6815746T (7493992262336241664 bytes)
>> disk size: 392G
>>
>> Disk size, although, looks more reasonable: the image's size is really
>> should be about 300-400G, as I remember.
>>
>> Alas, I can't do anything with this image. I can't check it by qemu-img,
>> neither I can convert it to the new image, as qemu-img can't do anything
>> with it:
>>
>>> qemu-img convert -p -f qcow2 -O qcow2 /mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak /mnt/tmp/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0
>> Could not open '/mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak': Invalid argument
>> Could not open '/mnt/sp1/ac2cb28f-09ac-4ca0-bde1-471e0c7276a0.bak'
>>
>> Any one have experienced the same issue? What do you think, is it qcow2
>> issue or a gfs2 issue? What would you do in similar situation?
>>
>> Any ideas, hints and comments would be greatly appreciated.
>>
>> Yes, I have snapshots, that's good, but wouldn't like to lose today's
>> changes to the data on that image. And I'm worried about the filesystem
>> at all: what if something goes wrong if I try to remove that file?
>>
>> Thanks to all!
>>
>>
>> -- 
>> V.Melnik
>>
>> P.S. I use CentOS-6 and I have these packages installed:
>> 	qemu-img-0.12.1.2-2.415.el6_5.4.x86_64
>> 	gfs2-utils-3.0.12.1-59.el6_5.1.x86_64
>> 	lvm2-cluster-2.02.100-8.el6.x86_64
>> 	cman-3.0.12.1-59.el6_5.1.x86_64
>> 	clusterlib-3.0.12.1-59.el6_5.1.x86_64
>> 	kernel-2.6.32-431.5.1.el6.x86_64
>>
>> -- 
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