> Thanks Stefan and Paolo for your response and advice! > > Hi Paolo, > > As to the virtio-scsi batch I/O submission feature in QEMU which you > mentioned, is this feature turned on by default in QEMU 2.9 or there is a > tunable parameters to turn on/off the feature?
Yes, it is available by default since 2.2.0. It cannot be turned off, however it is only possible to batch I/O with aio=native (and, since 2.12.0, with the NVMe backend). Paolo
