Ceph » rbd

There is a larger time and space overhead for performing a sparse read so it should be avoided for small IO. Backend support for sparse-read is disabled by default for filestore, and bluestore defaults to 16K allocations for SSDs and 64K allocations for HDDs. Perhaps it would be simplest to just restrict sparse-read to only the cases where the full object is being read and provide an advanced-level config override to lower the requirement if needed.