On 08.Feb.2014, at 11:25, Mogens Kjaer wrote: > On 02/07/2014 11:47 PM, Matt wrote: >> Having a >> single drive is slowing down reads as well, I think. > > This depends upon how the RAID is set up. No, mdraid 1 is mdraid 1. > A standard Linux RAID1 setup does not give better reading > performance when reading large files than a single disk. > > I don't know if the RAID system is cleaver enough to > save some seek time. Process X is utilizing only one single disk, so no performance gain. But if you have 2 processes in parallel, then you potentially have a gain, because the process Y can read from another disk. process X -> disk 0 process Y -> disk 1 > In order to get better read performance you'll have > to set it up as RAID10 with far copies. Yes, mdraid 10 could be a solution for the "1 process should utilize more than one disk" goal. I haven't tried it though, what a shame. Why is that far copies thing important? -- Markus