On Sat, Jan 20, 2018 at 6:26 PM, David Turner <drakonstein@xxxxxxxxx> wrote: > I am not able to find documentation for how to convert an existing cephfs > filesystem to use allow_ec_overwrites. The documentation says that the > metadata pool needs to be replicated, but that the data pool can be EC. But > it says, "For Cephfs, using an erasure coded pool means setting that pool in > a file layout." Is that really necessary if your metadata pool is replicated > and you have an existing EC pool for the data? Could I just enable ec > overwrites and start flushing/removing the cache tier and be on my way to > just using an EC pool? That snipped in the RADOS docs is a bit misleading: you only need to use a file layout if you're adding an EC pool as an addition pool rather than using it during creation of a filesystem. The CephFS version of events is here: http://docs.ceph.com/docs/master/cephfs/createfs/#using-erasure-coded-pools-with-cephfs As for migrating from a cache tiered configuration, I haven't tried it, but there's nothing CephFS-specific about it. If the underlying pool that's set as the cephfs data pool is EC and has allow_ec_overwrites then CephFS won't care -- but I'm personally not an expert on what knobs and buttons to use to migrate away from a cache tiered config. Do bear in mind that your OSDs need to be using bluestore (which may not be the case since you're talking about migrating an existing system?) John > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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