Hi, Like Shylesh said: you need to obey alignment constraints. See rados_ioctx_pool_requires_alignment in http://ceph.com/docs/hammer/rados/api/librados/ Cheers On 01/09/2015 08:49, shylesh kumar wrote: > I think this could be misaligned writes. > Is it multiple of 4k ?? Its just a wild guess. > > thanks, > Shylesh > > On Tue, Sep 1, 2015 at 9:17 AM, Hercules <hercules75@xxxxxxxxx <mailto:hercules75@xxxxxxxxx>> wrote: > > Hello, > > I use librados C API rados_append() to append object data in erasure coded pool, it always return -95 (Operation not supported). > Buf if i use the same code to append object data in replicated pool, it works fine. > Does erasure coded pool not support append write? > > Below is my erasure coded pool setting. > pool 2 'Edata_pool' erasure size 6 min_size 4 crush_ruleset 8 object_hash rjenkins pg_num 512 pgp_num 512 last_change 139 flags hashpspool stripe_width 4096 > > Any advice will appreciate. > Hercules > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > -- > Thanks & Regards > Shylesh Kumar M > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Loïc Dachary, Artisan Logiciel Libre
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