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 BugĀ 996327  on this issue including an attached script to repro the 
bug but there has been no activity on that bug so far.  

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


The script to create and attach LVM volumes using virtio-scsi is available here:
https://bugzilla.redhat.com/attachment.cgi?id=785925

Has anyone else run into this... I had the understanding that each 
virtio-controller could support 4K devices.

  --jim

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