Hello,
after another issue with discard I understood how it works.
-device virtio-scsi-pci,id=scsi0
--> Creates the controller with id scsi0.
-drive file=/dev/ssd0/sarabi,if=none,id=drive0
--> Initialize only (if=none) an image/volume to use.
-device scsi-hd,bus=scsi0.0,drive=drive0
--> Creates the disk on base of drive0 and connect it to port 0 of
controller scsi0 over bus=scsi0.0.
Thanks for not killing me.
Bye Markus
Am 07.02.2014 16:30, schrieb chickenmarkus@xxxxxxxxxx:
Hello,
in another mail list with another issue I had problems with HTML
content. Due no response I send my question in PLAIN/TEXT again.
Bye Markus
-------- Original-Nachricht --------
Betreff: Connecting disks to controller virtio-scsi of qemu/kvm
Datum: Wed, 05 Feb 2014 18:37:06 +0100
Von: chickenmarkus@xxxxxxxxxx
An: libvirt-users@xxxxxxxxxx
Hello,
I try to use the virtio-scsi driver to use my disks. But my setup at
first:
* in general Debian Wheezy
* Kernel: 3.11-0.bpo.2-amd64
(http://packages.debian.org/wheezy-backports/linux-image-3.11-0.bpo.2-amd64)
* Qemu-KVM: 1.7.0 (http://packages.debian.org/jessie/qemu-kvm)
* Virsh 1.2.1 (http://packages.debian.org/jessie/libvirt-bin)
The new kernel and dirty things from Jessie are for discard support
(also not working with current configuration despite thin volumes with
working discard). Once I have the this "new" qemu version, why not to
use virtio...
Every disk with target bus "scsi" gets an own scsi-hd device. Libvirt
ignores the scsi controller of type virtio-scsi.
Here is a XML snippet:
<devices>
<controller type='scsi' model='virtio-scsi' index="0"/>
<disk type="block" device="disk">
<source dev="/dev/ssd0/sarabi"/>
<driver discard="unmap"/>
<target dev="sda" bus="scsi"/>
<address type="drive" controller="0" bus=0/>
</disk>
</devices>
This creates the virtio-scsi controller (verified by lspci in guest)
but do not "connect" the disks to it. The resulting command line looks
following:
kvm [...] -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x5 -drive
file=/dev/ssd0/sarabi,if=none,id=drive-scsi0-0-0-0,format=raw,discard=unmap
-device
scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2
[...]
How get my disk to run over virtio-scsi? Or did I found something like
a bug?
Bye Markus
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