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Re: [libvirt-users] Fwd: Connecting disks to controller virtio-scsi of qemu/kvm



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 freenet de:
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 freenet de
An:     libvirt-users redhat com



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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