On 10/07/12 03:17, Dan Mick wrote:
Well, it's not so much those; those are the objects that hold data
blocks. You're more interested in the objects whose names end in
'.rbd'. These are the header objects, one per image, and are
interpreted by rbd info, but I'm concerned that one of them may not
exist.
Right on the ball: .rbd for image concerned just does not exist. So how
can we recover from this? And why it has disappeared in first place? (I
guess latter may be related to some sort of bug)
On 07/09/2012 03:29 AM, Vladimir Bashkirtsev wrote:
On 09/07/12 18:33, Dan Mick wrote:
Vladimir: you can do some investigation with the rados command. What
does
rados -p rbd ls show you?
Rather long list of:
rb.0.11.000000002786
rb.0.d.0000000054a2
rb.0.6.000000002eb5
rb.0.d.000000008294
rb.0.13.000000000377
rb.0.e.000000000629
rb.0.6.000000002756
rb.0.d.000000006156
rb.0.d.000000009b82
rb.0.5.000000000c9e
rb.0.d.0000000080ba
rb.0.f.000000000e75
rb.0.6.00000000ab4f
rb.0.d.0000000048e4
rb.0.d.000000005f67
rb.0.13.0000000014ad
rb.0.d.00000000e074
rb.0.f.000000001a4b
rb.0.13.0000000004a3
...
How to find out to which image these objects belong?
On 07/08/2012 10:42 PM, Vladimir Bashkirtsev wrote:
Hello,
I just hit this error:
error opening image sip.logics.net.au: (2) No such file or directory
2012-07-09 15:03:59.935835 7ffbe0673780 -1 librbd: error finding
header: (2) No such file or directory
Googled around and found that Oliver Francke had similar issue back
in March. Read your responses but still unclear where to start to
dig. Just upgraded from 0.47.3 to 0.48, done rolling upgrade and all
RBD images are OK with exception of this one. Notably as upgrade was
done while VM was up it continued to run unaffected (ie all data
inside of VM was written and read as nothing happened). It makes me
think that there no data loss but mere broken header.
Of course I have a backup of VM and can pull it back in no time but I
am really interested (and I am sure other ceph users) how to recover
from such failures?
Regards,
Vladimir
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