[ceph-users] Xen & Ceph bad crc

Ilya Dryomov idryomov at gmail.com
Thu Oct 5 02:04:13 PDT 2017


On Thu, Oct 5, 2017 at 9:05 AM, Osama Hasebou <osama.hasebou at csc.fi> wrote:
> Hi Everyone,
>
> We are testing running Ceph  as a backend for Xen server acting as the
> client, and when a pool was created and mounted it as RBD in one of the
> client server, while adding data to it, we see this below error :
>
> ========
> [939656.039750] libceph: osd20 10.255.0.9:6808 bad crc/signature
> [939656.041079] libceph: osd16 10.255.0.8:6816 bad crc/signature
> [939735.627456] libceph: osd11 10.255.0.7:6800 bad crc/signature
> [939735.628293] libceph: osd30 10.255.0.11:6804 bad crc/signature
>
>
> They are like 15 to 50 times in an hour when it happens,  There are some
> hours when it don't happens there are 564 such errors since yesterday.
>
>
> # uname -sr
> Linux 4.13.1-1.el7.elrepo.x86_64
>
> # ceph -v
> ceph version 12.2.0 (32ce2a3ae5239ee33d6150705cdb24d43bab910c) luminous (rc)
>
> # cat /etc/*-release
> CentOS Linux release 7.3.1611 (Core)
>
>
> Any ideas why is this happening ?

The stable pages issue mentioned by Jason shouldn't affect your kernel.
Just to make sure, what's the output of

  $ cat /sys/block/rbd0/bdi/stable_pages_required

Thanks,

                Ilya


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