On Fri, Apr 17, 2015 at 3:29 PM, Loic Dachary <l...@dachary.org> wrote: > Hi, > > Although erasure coded pools cannot be used with CephFS, they can be used > behind a replicated cache pool as explained at > http://docs.ceph.com/docs/master/rados/operations/cache-tiering/. > > Cheers > > On 18/04/2015 00:26, Ben Randall wrote: >> Hello all, >> >> I am considering using Ceph for a new deployment and have a few >> questions about the current implementation of erasure codes. >> >> I understand that erasure codes have been enabled for pools, but that >> erasure coded pools cannot be used as the basis of a Ceph FS. Is it >> fair to infer that erasure coded storage pools are only accessible >> through a library (rados) or API? >> >> Are there any plans to support erasure coded pools in Ceph FS? It >> would be excellent to be able to mount erasure coded storage in a >> POSIX-like fashion, similar to how Ceph FS with replicated pools works >> now.
In particular, EC pools in RADOS have a limited subset of the full RADOS functionality — objects are append-only. We've had blue-sky discussions about how we'd build a filesystem on top of that (with a log-structured format of some kind) but there is no work planned on the subject; it would require some fairly significant changes to both the userspace and kernel clients to support the changed data format. -Greg _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
