Hi,
On 12/15/2011 04:07 PM, Guido Winkelmann wrote:
Hi,
I've got a small ceph cluster with one mon, one mds and two osds (all on the
same machine, for now), that I want to use as a block- and file storage backend
for qemu machine virtualisation.
I found that read access to some of the rbd images, or parts of some of them
sometimes blocks indefinitely, usually after the image has been sitting around
untouched for a while, for example over night. This has the effect that virtual
machines that try to access their disks as well as rbd commands like "rbd cp"
will just hang indefinitely.
I found that these blocks can usually be "fixed" by restarting one of the
osds.
The last time this happened, ceph -s reported one of the osds to be in state
"active+clean+scrubbing". (I'm afraid I don't have the complete output from
ceph -s anymore.)
I've been seeing the exact same behaviour, but I wasn't able yet to get
into it a bit deeper.
As far as I know, when a PG gets scrubbed it become unavailable for a
short period, but since this scrub blocks/loops the PG will never become
available again, thus blocking the virtual machine.
I saw this behaviour with v0.37 and 0.38, upgrading to 0.39 to see if it
still exists.
Wido
Does anybody have any idea what could be going wrong here?
Guido
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