Hello, On Wed, May 12, 2021 at 01:22:42PM -0400, David T-G wrote: > RAID10 is striping AND mirroring (leaving out for the moment the distinction > of striping mirrors vs mirroring stripes). How can one have both with only > two disks?? You either stripe the two disks together for more storage or > mirror them for redundant storage, but I just don't see how one could do both. Linux RAID-1 is a mirror - all devices are identical. A reading thread picks a device and reads from it. You get up to 1 device worth of IOPS. Linux RAID-10 splits the data into chunks and stripes them across the devices with as many copies as desired (default 2). So a single threaded reader can get up to n devices worth of IOPS. When n is 2 and there's only 2 identical devices and the load is multi-thread/process then you may not see much difference. Measure it and let us know! Cheers, Andy
