Ceph » RADOS

There's no parameter set could pass the parameter checking in cep_erasure_code_benchmark while using LRC.

if (erasure_code->get_data_chunk_count() != (unsigned int)k ||
      (erasure_code->get_chunk_count() - erasure_code->get_data_chunk_count()
       != (unsigned int)m)) {
    cout << "paramter k is " << k << "/m is " << m << ". But data chunk count is " 
      << erasure_code->get_data_chunk_count() <<"/parity chunk count is " 
      << erasure_code->get_chunk_count() - erasure_code->get_data_chunk_count() << endl;
    return -EINVAL;
}

This checking blocks valid LRC parameters (e.g. k=4, m=2, l=3) and return error. I cannot run LRC benchmark since all the parameter combinations fail in either ceph_erasure_code_benchmark or LRC plugin.

This can be reproduced by
$ ceph_erasure_code_benchmark --plugin lrc --workload encode --iterations 1048576 --size 4096 --parameter k=4 --parameter m=2 --parameter l=3 --erasure-code-dir /usr/lib64/ceph/erasure-code/