Hi, we have noticed that we get around 30MB/s of write speed per vm in oVirt on our datastore that is a GPFS filesystem mounted as posix compliant fs. Read speeds are around 1.5-3.3GB/s. We tested directly on the mount from the host cli with some benchmarking tools and from the host directly into the gpfs filesystem we get line speeds but from vms we dont.. does anybody have some clues to what is going on and what to try? Br Andi