Hi ceph-users, Im bit stuck with librados, partcularly rados_cache_pin finction. For some reason it returns "Invalid argument", error code 22. Can't find what im doing wrong. in rados_cache_pin im using the same ioctx and obj name like i use with rados_write - which works just fine. Any help is more then welcome. Daniel Mezentsev, founder (+1) 604 313 8592. Soleks Data Group. Shaping the clouds.