Sorry about the microphone issues in the performance meeting today today. This is a followup to the 11/4 performance meeting where we discussed increasing the worker thread count in the OSD's vs making multiple OSD's (and partitions/filesystems) per device. We did the high level experiment and have some results which I threw into a ppt/pdf, and shared them here: http://www.docdroid.net/UbmvGnH/increasing-shards-vs-multiple-osds.pdf.html Doing 20-shard OSD's vs 4 OSD's per device with default 5 shards yielded about half of the performance improvement for random 4k reads. For writes performance is actually worse than just 1 OSD per device and the default # of shards. The throttles should be large enough for the 20-shard use case as they are 10x the defaults, although if you see anything we missed let us know. I had the cluster moved to Infernalis release (with JEMalloc) yesterday, so hopefully we'll have some early results on the same 5-node cluster soon. Thanks, Stephen -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
