Re: [Users] EL5 support for VirtIO SCSI?

> ----- Original Message ----- > > Hello Itamar. > > The specific use case is a particular propriety filesystem that needs to > > see > > a scsi device. It will do scsi inquiry conmmands to verify suitability. > > In talking to the devs - of the filesystem - there is no way around it. I'd > > previously tried virtio-block - resulting in the /dev/vd* device - and the > > filesystem would not work. > > > > From doing a bit of web searching it appears the kvm/qemu supports (or did > > support) an emulated LSI scsi controller. My understanding is that the > > various virtualization platforms will emulate a well supported device (by > > the guest OSes) so that drivers are not an issue. For example this should > > allow a VM on Vmware vsphere/vcenter to be exported to Ovirt and have it > > boot up. The potential for further optimising the guest is there by > > installing ovirt/qemu/kvm guest utils that then allow the guest OS to > > understand the virtio nic and scsi devices. The guest could then be shut > > down, the nic and scsi controller changed and the guest booted up again. > > You can do the same thing in the Vmware world by installing their guest > > tools, shutting down the guest VM, then reconfiguring it with a vmxnet3 nic > > and pvscsi scsi adapter, then booting up again. > > It does seem somewhat inconsistent in Ovirt that we allow a choice of Intel > > e1000 or virtio nics, but do not offer any choice with the scsi adapter. > > virtio-scsi support was just recently added to oVirt to allow for scsi > passthrough and improved performance over virtio-blk. > I believe the emulated scsi device in qemu never matured enough but possibly > Stefan (cc'd) can correct me here.