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.

[richard-mansfield]

FYI, my environment is:

• host O/S is Ubuntu 22.04 (5.15.0-92-generic)
• guess O/S is Rocky Linux (4.18.0-477.27.1)
• vagrant-libvirt (0.12.2, global)
• QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.16)

[electrofelix]

Unfortunately it would require reworking the template to apply the disk controller piece to additional disks as well.

vagrant-libvirt/lib/vagrant-libvirt/templates/domain.xml.erb

Line 168 in a94ce0d

<%- scsi_volumes = @domain_volumes.select { |x| x[:bus] == 'scsi' } %>

A work around would be to hook a custom class to modify the domain XML after the domain has been defined and before it's started, otherwise it requires patching and a new release

[richard-mansfield]

A colleague of mine mentioned a workaround to set libvirt.storage :file, :bus="sata" for additional disks. In which case the 2nd and subsequent storage controllers uses Intel Corporation 82801IR/IO/IH 6-port SATA controller.

[root@node1 ~]# lspci -nn | grep "controller" | grep -E "(SCSI|SATA)"
00:1f.2 SATA controller [0106]: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] [8086:2922] (rev 02)
02:01.0 SATA controller [0106]: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] [8086:2922] (rev 02)
02:02.0 SATA controller [0106]: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] [8086:2922] (rev 02)
03:00.0 SCSI storage controller [0100]: Red Hat, Inc. Virtio SCSI [1af4:1048] (rev 01)