Re: qemu-kvm-0.13.0 - winsows 2008 - chkdisk too slow

Nikola Ciprich
2011-01-06T09:08:53Z

Hello Stefan!
> Please post your KVM command-line.
/usr/bin/qemu-kvm -S -M pc-0.13 -enable-kvm -m 4096 -smp 2,sockets=2,cores=1,threads=1 -name vmwts02 -uuid 1e501300-dc48-11df-a690-00304834195b -nodefconfig -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vmwts02.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=localtime -boot c -drive file=/dev/vgshared/vmwts02-1,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=22,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=00:16:3e:61:01:00,bus=pci.0,addr=0x3 -usb -vnc 0.0.0.0:30801 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

I see I could disable cache for storage, but I don't want to kill
fsck now just to test if it helps (and I guess it shouldn't make
such a difference).

> Have you run storage benchmarks on the host to check what sort of
> maximum I/O performance you can expect? Do you have a RAID setup
> underneath LVM?
Not for windows, but in general it is running quite fast, only the chkdsk
seems to be bad. In other VMs (linux), I'm achieving write speeds >40MB/s.
Storage configuration is a bit comples, it's DRBD replicated storage,
on top of it sits clustered LVM and KVMS use logical volumes on top of it.
but as I said, overall performance is OK.

>
> Stefan
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html