Thank you for your reply Ilya.
However, this means that if we want to activate a pool with cache, it
will be necessary to upgrade the kernel of all clients even if they do
not use this feature. :(
Regards,
Laurent Barbe
Le 21/01/2014 10:46, Ilya Dryomov a écrit :
On Tue, Jan 21, 2014 at 10:28 AM, Laurent Barbe <laurent@xxxxxxxxxxx> wrote:
Hi all,
About 0.75, when I created cache pool, kernel client like rbd or cephfs make
error "feature set mismatch". (Even if the device is not on the cached pool)
$ rbd map rbd/myrbd => OK
$ ceph osd pool create otherpool1 100 100
$ ceph osd pool create otherpool2 100 100
$ ceph osd tier add otherpool1 otherpool2
$ ceph osd tier cache-mode otherpool2 writeback
$ rbd map rbd/myrbd
kern log >> libceph: mon2 10.2.0.90:6789 feature set mismatch, my 4a042a42 <
server's 84a042a42, missing 800000000
Does the commit
https://github.com/ceph/ceph/commit/431a13eb370310a383abceeb509fe204a519e087
fix this ?
No, I don't think so. I might be wrong, but I think the idea is to
require OSD_CACHEPOOL feature if any tiering relationships are present.
Work on the kernel client is on-going, tiering support should arrive in
3.14.
Thanks,
Ilya
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