On Thu, Sep 27, 2012 at 11:04 AM, Gregory Farnum <[email protected]> wrote: > However, my suspicion is that you're limited by metadata throughput > here. How large are your files? There might be some MDS or client > tunables we can adjust, but rsync's workload is a known weak spot for > CephFS.
I feel like people are missing this part of Greg's message. Everyone is so busy benchmarking RADOS small I/O, but what if it's currently bottlenecked by all the file-level access operations that interact with the MDS? Rsync causes a ton of those. If you want to benchmark just the small IO, you can't compare rsync to rsync. If you want to benchmark just the metadata part, rsync with 0-size files might actually be an interesting workload. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
