I am getting very slow write speeds (<1MB) with RAID 1 and RAID 0 (striping and mirroring). The read speeds are sufficiently fast but writing is very slow. At first I thought it was just poor performance under RAID 1 but it is occuring with RAID 0 (although not as bad).
I noticed that compared to when Ubuntu was on a virtual machine there are multiple instances of
kdmflush process running using most of my IO (detected using
Does anyone have any suggestions as to what could be causing this?