Re: [openstack-dev] [Ceph] Why performance of benchmarks with small blocks is extremely small?

2014-09-30 Thread Gregory Farnum
On Sat, Sep 27, 2014 at 8:14 AM, Timur Nurlygayanov tnurlygaya...@mirantis.com wrote: Hello all, I installed OpenStack with Glance + Ceph OSD with replication factor 2 and now I can see the write operations are extremly slow. For example, I can see only 0.04 MB/s write speed when I run rados

Re: [openstack-dev] [Ceph] Why performance of benchmarks with small blocks is extremely small?

2014-09-29 Thread Pasquale Porreca
Hello I have no experience with Ceph and this specific benchmark tool, anyway I have experience with several other performance benchmark tools and file systems and I can say it always happen to have very very low performance results when the file size is too small (i.e. 1MB). My suspect is

Re: [openstack-dev] [Ceph] Why performance of benchmarks with small blocks is extremely small?

2014-09-29 Thread Clay Gerrard
I also have limited experience with Ceph and rados bench - but it looks like you're setting the number of worker threads to only 1? (-t 1) I think the default is 16, and most storage distributed storage systems designed for concurrency are going to do a bit better if you exercise more concurrent