On Wed, Aug 16, 2017 at 3:27 PM, Henrik Korkuc <li...@kirneh.eu> wrote: > Hello, > > I have use case for billions of small files (~1KB) on CephFS and as to my > experience having billions of objects in a pool is not very good idea (ops > slow down, large memory usage, etc) I decided to test CephFS inline_data. > After activating this feature and starting copy process I noticed that > objects are still created on data pool, but their size is 0. Is this > expected behavior? Maybe someone can share tips on using large amount of > small objects? I am on 12.1.3, already using decreased min block size for > bluestore.
Couple of thoughts: - Frequently when someone has a "billions of small files" workload they really want an object store, not a filesystem - In many cases the major per-file overhead is MDS CPU req/s rather than the OSD ops, so inline data may be efficient but not result in overall speedup - If you do need to get rid of the overhead of writing objects to the data pool, you could work on creating a special backtraceless flag (per-filesystem), where the filesystem cannot do lookups by inode (no NFS, no hardlinks, limited disaster recovery), but it doesn't write backtraces either. John > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
