Unable to set @disk_controller_mode for additional disks

[richard-mansfield]

Setting disk_bus=scsi in the domain specifications set the storage controller model to virtio-scsi but only for the box image. If I specify more than 8 additional drives via libvirt.storage :file, :bus="scsi" the second and subsequent storage controllers revert to lsilogic. How can a specify the storage controller model in my case?

[root@node1 ~]# lspci -nn | grep "SCSI storage controller"
02:01.0 SCSI storage controller [0100]: Broadcom / LSI 53c895a [1000:0012]
02:02.0 SCSI storage controller [0100]: Broadcom / LSI 53c895a [1000:0012]
03:00.0 SCSI storage controller [0100]: Red Hat, Inc. Virtio SCSI [1af4:1048] (rev 01)

The box image I am using does not have support for LSI 53c895a although I could inject kmod-sym53c8xx but this would require updating the guest kernel which is not desirable for this project.

Originally posted by @richard-mansfield in #1801