Am 30.05.19 um 18:16 schrieb Robin Hill: > On Thu May 30, 2019 at 05:58:34PM +0200, keld@xxxxxxxxxx wrote: > >> On Thu, May 30, 2019 at 04:37:43PM +0200, Reindl Harald wrote: >>> >>> >>> Am 30.05.19 um 12:04 schrieb keld@xxxxxxxxxx: >>>> you need to clarify which layout you use with md raid10. >>>> the layouts are near, far and offset, with very different performance characteristics. >>>> far and offset are designed to be faster than near, which I understand that you use. >>>> So why are you using the slowest md raid10 layout, and not mentioning this fact? >>> >>> besides that when you install a distribution like Fedora "near" is >>> default for pure reads it shouldn't be slower than RAID1 at all, just >>> read from both mirrors of the stripe >> >> near is mdadm default, so people often do not realize the faster options. >> > Are they not only faster on physical disks? The OP indicated they have > an SSD and an NVMe, so I don't see why any of the RAID-10 variations > would perform any better. because what matters is the question over how many drives the read is spread - read from 4 lightning fast drives at the ame time is still faster then read only from one - as long there is not other bottenleck
