Hmm. I'd rather not recreate by cephfs filesystem from scratch if I don't have do. Has anyone managed to add a cache tier to a running cephfs filesystem?
On Sun Nov 16 2014 at 1:39:47 PM Erik Logtenberg <[email protected]> wrote: > I know that it is possible to run CephFS with a cache tier on the data > pool in Giant, because that's what I do. However when I configured it, I > was on the previous release. When I upgraded to Giant, everything just > kept working. > > By the way when I set it up, I used the following commmands: > > ceph osd pool create cephfs-data 192 192 erasure > ceph osd pool create cephfs-metadata 192 192 replicated ssd > ceph osd pool create cephfs-data-cache 192 192 replicated ssd > ceph osd pool set cephfs-data-cache crush_ruleset 1 > ceph osd pool set cephfs-metadata crush_ruleset 1 > ceph osd tier add cephfs-data cephfs-data-cache > ceph osd tier cache-mode cephfs-data-cache writeback > ceph osd tier set-overlay cephfs-data cephfs-data-cache > ceph osd dump > ceph mds newfs 5 6 --yes-i-really-mean-it > > So actually I didn't add a cache tier to an existing CephFS, but first > made the pools and added CephFS directly after. In my case, the "ssd" > pool is ssd-backed (obviously), while the default pool is on rotating > media; the crush_ruleset 1 is meant to place both the cache pool and the > metadata pool on the ssd's. > > Erik. > > > On 11/16/2014 08:01 PM, Scott Laird wrote: > > Is it possible to add a cache tier to cephfs's data pool in giant? > > > > I'm getting a error: > > > > $ ceph osd tier set-overlay data data-cache > > > > Error EBUSY: pool 'data' is in use by CephFS via its tier > > > > > > From what I can see in the code, that comes from > > OSDMonitor::_check_remove_tier; I don't understand why set-overlay needs > > to call _check_remove_tier. A quick look makes it look like set-overlay > > will always fail once MDS has been set up. Is this a bug, or am I doing > > something wrong? > > > > > > Scott > > > > > > > > _______________________________________________ > > ceph-users mailing list > > [email protected] > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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