diff --git a/zuul.d/ironic-inspector-jobs.yaml b/zuul.d/ironic-inspector-jobs.yaml
index 1fc9eb336..acfdb6bbe 100644
--- a/zuul.d/ironic-inspector-jobs.yaml
+++ b/zuul.d/ironic-inspector-jobs.yaml
@@ -35,6 +35,8 @@
         IRONIC_TEMPEST_BUILD_TIMEOUT: 2400
         SWIFT_ENABLE_TEMPURLS: True
         SWIFT_TEMPURL_KEY: secretkey
+        IRONIC_VM_SPECS_DISK: 6
+        LIBVIRT_STORAGE_POOL_PATH: /opt/libvirt/images
       devstack_plugins:
         ironic-inspector: https://opendev.org/openstack/ironic-inspector
       devstack_services:
@@ -120,6 +122,10 @@
     vars:
       grenade_devstack_localrc:
         shared:
+          #NOTE: when in UEFI mode, TFTP packets don't get tracked nor
+          #pass between original and upgrade networks. Switch to BIOS
+          #until we can fix this properly.
+          IRONIC_BOOT_MODE: bios
           DEFAULT_INSTANCE_TYPE: baremetal
           FORCE_CONFIG_DRIVE: True
           INSTALL_TEMPEST: False
@@ -149,7 +155,7 @@
       grenade_localrc:
         BASE_RUN_SMOKE: False
       grenade_tempest_concurrency: 1
-      grenade_test_timeout: 2400
+      grenade_test_timeout: 2600
       devstack_plugins:
         ironic: https://opendev.org/openstack/ironic
         ironic-inspector: https://opendev.org/openstack/ironic-inspector