> There are a lot of variables here. Are you using virtio-blk > devices and Windows guest drivers? No, those measurements were taken when I was using IDE emulated drives. To further clarify the NFS server is also software, not hardware, RAID-5. But your subtle hint and IBMs Best practices for KVM (http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/topic/liaat/liaatbestpractices_pdf.pdf) were enough to galvanise me into action, so I have since reconfigured the guest to use Redhat Windows Virtio drivers instead. The results are much better, with 64MB writes on the system drive coming in at 39MB/s and reads 310MB/s. The second drive gives me 94MB/s for writes and 777MB/s for reads for a 64MB file. Again, that's wildy different results for two storage devices in the same guest, and it needs further investigation, but now the system is usable and I need to move on. For anyone reading this and looking for help to change the storage devices from IDE to virtio, the instructions I followed are at http://www.linux-kvm.com/content/redhat-54-windows-virtio-drivers-part-2-block-drivers Thanks for the hint! Kevin-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
