> > My read speed is consistently around 40MB/second, and my write speed is > > consistently around 22MB/second. I had expected better of read... > > You may want to try increasing your read_ahead_kb on the OSD data disks > and see if that helps read speeds. > Default appears to be 128 and I was getting 40MB/second Increasing to 256 takes me up to 48MB/second Increasing to 512 takes me up to 53Mb/second Any further increases don't do anything that I can measure Is increasing read_ahead_kb good for general performance, or just for impressing people with benchmarks? If the kernel spent time reading ahead woult it hurt random read/write performance? Thanks James -- 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
