[libvirt-users] Error Attaching Seventh VirtIO-SCSI Device to Guest

[McEvoy, James]

> -----Original Message-----
> From: Osier Yang [mailto:jyang at redhat.com]
> Sent: Friday, September 06, 2013 10:54 PM
> To: McEvoy, James
> Cc: libvirt-users at redhat.com
> Subject: Re: [libvirt-users] Error Attaching Seventh VirtIO-SCSI Device to Guest
> 
> On 04/09/13 09:34, McEvoy, James wrote:
> > I have run into a problem attempting to attach the seventh virtio-scsi device
> to a RHEL 6.4 Guest from a RHEL 6.4 host running libvirt version 0.10.2-18.
> > I have a guest that is running RHEL6.4 where I can attach disks sda(boot), sdb,
> sdc, sdd, sde and sdf but when I try to attach sdg the virsh attach-disk
> command fails with the error:
> > error: Failed to attach disk
> > error: internal error Unable to determine model for scsi controller
> >
> > I logged Bug 996327  on this issue including an attached script to repro the
> bug but there has been no activity on that bug so far.
> 
> I took the bug.
> 
> >
> > This is the results when attaching virtio-scsi disks in a loop. Sdf is attached
> but sdg fails.
> >
> > virsh attach-disk --domain UEM004n1 --source /dev/GuestVols/UEM004-5
> > --target sdf --cache none --type disk --config --wwn 1fc7058865439717
> > --serial c7d11fc7058865439717 --shareable Disk attached successfully
> >
> > Vol UEM004-6 created
> > virsh attach-disk --domain UEM004n1 --source /dev/GuestVols/UEM004-6
> > --target sdg --cache none --type disk --config --wwn 4d3ddb9d15b05e7e
> > --serial 62fd4d3ddb9d15b05e7e --shareable
> >
> > error: Failed to attach disk
> > error: internal error Unable to determine model for scsi controller
> 
> It looks odd,  It looks to me there is new scsi controller is generated
> automatically by libvirt when the 6th volume is attaching to the domain, since
> for narrow SCSI bus, we allow 7 unit for each SCSI controller. But it's strange
> that it couldn't get a default model for the new SCSI controller.
> 
> Can you get the devices your qemu supports by:
> 
>      $ qemu-kvm -device ?
> 
> And attach your domain conf?
> 
> Either in the list or in the bug is fine.
> 
> Osier

Hi Osier,

I have attached the details you asked for to the bug 996327 and here is the short version:

These are the qemu-kvm -drive and -device options for /dev/sdg on the guest:
-drive file=/dev/GuestVols/UEM002-6,if=none,id=drive-scsi0-0-0-6,format=raw,serial=8aad44f9e53e05868e81,cache=none 
-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=6,drive=drive-scsi0-0-0-6,id=scsi0-0-0-6,wwn=44f9e53e05868e81 

I am seeing an error on device /dev/sdg on the guest when I query SCSI page 0x83 for that device.
[root at node1 ~]# sg_inq -p 0x83 /dev/sdg
VPD INQUIRY: Device Identification page
  Designation descriptor number 1, descriptor length: 24
    designator_type: vendor specific [0x0],  code_set: ASCII
    associated with the addressed logical unit
      vendor specific: 22b0daf285d88050fd39
  Designation descriptor number 2, descriptor length: 12
    designator_type: NAA,  code_set: Binary
    associated with the addressed logical unit
      << unexpected naa [0xd]>>
 00     da f2 85 d8 80 50 fd 39                             .....P.9        
[root at node1 ~]#

One other detail, I am defining the scsi controller using the virt-install command.

  --jim