5 Upgrading the different software modules may cause different impact on
6 the availability of the infrastructure resources and even on the service
7 continuity of the vNFs.
9 **Software modules in the computing nodes**
13 #. Hypervisor, such as KVM, QEMU, XEN, libvirt
14 #. Openstack agent in computing nodes (like Nova agent, Ceilometer
17 .. <MT> As SW module, we should list the host OS and maybe its
18 drivers as well. From upgrade perspective do we limit host OS
19 upgrades to patches only?
21 **Software modules in network nodes**
23 #. Neutron L2/L3 agent
26 **Software modules storage nodes**
30 The table below analyses such an impact - considering a single instance
31 of each software module - from the following aspects:
33 - the function which will be lost during upgrade,
34 - the duration of the loss of this specific function,
35 - if this causes the loss of the vNF function,
36 - if it causes incompatibility in the different parts of the software,
37 - what should be backed up before the upgrade,
38 - the duration of restoration time if the upgrade fails
40 These values provided come from internal testing and based on some
41 assumptions, they may vary depending on the deployment techniques.
42 Please feel free to add if you find more efficient values during your
45 https://wiki.opnfv.org/_media/upgrade_analysis_v0.5.xlsx
47 Note that no redundancy of the software modules is considered in the table.