On Fri, Jan 29, 2016 at 11:53:35AM +0100, Christian Affolter wrote: > Hi everyone, > > I'm trying to understand the differences of some bandwidth and IOPs test > results I see while running a random-write full-stripe-width aligned fio > test (using libaio with direct IO) on a hardware RAID 6 raw device > versus on the same device with the XFS file system on top of it. > > On the raw device I get: > write: io=24828MB, bw=423132KB/s, iops=137, runt= 60085msec > > With XFS on top of it: > write: io=14658MB, bw=249407KB/s, iops=81, runt= 60182msec Now repeat with a file that is contiguously allocated before you start. And also perhaps with the "swalloc" mount option. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
