How did you create filesystems and/or partitions on this RBD block device?
The obvious causes would be
1) you partitioned it and the partition on which you ran mkfs points or pointed
during mkfs outside the block device size (happens if you for example automate
this and confuse sectors x cylinders, or if you copied the partition table with
dd or from some image)
or
2) mkfs created the filesystem with pointers outside of the block device for
some other reason (bug?)
or
3) this RBD device is a snapshot that got corrupted (or wasn't snapshotted in
crash-consistent state and you got "lucky") and some reference points to a
non-sensical block number (fsck could fix this, but I wouldn't trust the data
integrity anymore)
Basically the filesystem thinks the block device should be larger than it is
and tries to reach beyond.
Is this just one machine or RBD image or is there more?
I'd first create a snapshot and then try running fsck on it, it should
hopefully tell you if there's a problem in setup or a corruption.
If it's not important data and it's just one instance of this problem then I'd
just trash and recreate it.
Jan
> On 12 Nov 2015, at 20:14, Bogdan SOLGA <bogdan.so...@gmail.com> wrote:
>
> Hello everyone!
>
> We have a recently installed Ceph cluster (v 0.94.5, Ubuntu 14.04), and today
> I noticed a lot of 'attempt to access beyond end of device' messages in the
> /var/log/syslog file. They are related to a mounted RBD image, and have the
> following format:
>
> Nov 12 21:06:44 ceph-client-01 kernel: [438507.952532] attempt to access
> beyond end of device
> Nov 12 21:06:44 ceph-client-01 kernel: [438507.952534] rbd5: rw=33,
> want=6193176, limit=4194304
>
> After restarting that Ceph client, I see a lot of 'metadata I/O error'
> messages in the boot log:
>
> XFS (rbd5): metadata I/O error: block 0x46e001 ("xfs_buf_iodone_callbacks")
> error 5 numblks 1
>
> Any idea on why these messages are shown? The health of the cluster shows as
> OK, and I can access that block device without (apparent) issues...
>
> Thank you!
>
> Regards,
> Bogdan
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