Use iSCSI multipath for libvirt

* Multipath daemon allows to reach block devices via multiple paths for better resiliency and performance. Multipathd periodically checks the failed iscsi paths and maintains a list of valid paths. Libvirt can use more than one iSCSI path when option volume_use_multipath is set and when multipathd enabled. Change-Id: I54629656803c4989f7673e8c69d2a820609b5960 Implements: blueprint nova-libvirt-multipath-iscsi
openstack · Aug 19, 2020 · 56710de · 56710de
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commit 56710de
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diff --git a/ansible/roles/nova-cell/templates/nova.conf.d/libvirt.conf.j2 b/ansible/roles/nova-cell/templates/nova.conf.d/libvirt.conf.j2
@@ -24,3 +24,6 @@ virt_type = {{ nova_compute_virt_type }}
 {% if nova_libvirt_cpu_mode %}
 cpu_mode = {{ nova_libvirt_cpu_mode }}
 {% endif %}
+{% if enable_multipathd | bool %}
+volume_use_multipath = True
+{% endif %}
diff --git a/releasenotes/notes/nova-libvirt-multipath-iscsi-eb961e44e6fec9ff.yaml b/releasenotes/notes/nova-libvirt-multipath-iscsi-eb961e44e6fec9ff.yaml
@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Enabling multipathd will now configure Nova to use it.