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Hi @spirit I tried with ceph.conf file on server and I didnt get any speed advantage also tried with no caching and same thing actually performance went down a little here are the numbers 1- normal librbd current situation write : bw=5176.1KB/s, iops=1294 read : bw=3199.7KB/s, iops=799 2-...

will try them today never thought about the debug in config file and the writeback Thanks

actually the krbd results seems more like the actual results that we should get considering the size of the cluster . for the optimizations -disable cephx auth done already -don't use cache=writeback Does this give better performance ? I domt remeber trying without caching assuming i must cache...

Hi All, I have been working on optimizing our cluster performance and I noticed that using krbd will give us approx 10X read/write performance gain compared to librbd. And while I am thinking to switch I want to understand why ?. I know krbd is running in the kernel so it in not userspace...