1. X V Consumer C1 Consumer C2 Consumer C3
4. Switch to STBY configuration V
Consumer C1
Consumer C2
Consumer C3
3. FaultNotification
(VM ID, Fault ID)
5. Instruction
(VM ID)
OpenStack Northbound Interface
2. Inform the Consumer?
If YES, find owner of affected VMs from database
Virtualized Infrastructure Manager (VIM), e.g. OpenStack
Resource Map
VM-1
VM-2
VM-7
VM-4
Server – VM mapping
Server S1
VM-1, VM-2
Server S2
VM-7
Server S3
VM-4
6. Execute Instruction
- e.g. migrate VM
Ownership information
VM-1, VM-7
Consumer C1
VM-2
Consumer C2
VM-4
Consumer C3
Resource Pool
Hypervisor
Hypervisor
Hypervisor
Hardware Server S1
Hardware Server S2
Hardware Server S3 X
1. Fault Monitoring
- Hardware fault
- Hypervisor fault
- Host OS fault

2. V Administrator Consumer C1 Consumer C2 Consumer C3
4. Switch to STBY configuration V
Administrator
Consumer C1
Consumer C2
Consumer C3
3. Maintenance Notification
(VM ID)
1. Maintenance Request (Server S3)
5. Instruction
(VM ID)
OpenStack Northbound Interface
Virtualized Infrastructure Manager (VIM), e.g. OpenStack
VM-1
VM-2
VM-7
VM-4
6. Execute Instruction
- e.g. migrate VM
Resource Map
Server – VM mapping
Server S1
VM-1, VM-2
Server S2
VM-7
Server S3
VM-4
Resource Pool
Hypervisor
Hypervisor
Hypervisor
Ownership information
VM-1, VM-7
Consumer C1
VM-2
Consumer C2
VM-4
Consumer C3
Hardware Server S1
Hardware Server S2
Hardware Server S3
2. Which VMs are affected?
Find Consumer owning the VM(s) from the database.

3. 3-1 High Level Architecture
Virtualized Network Functions
Consumer and Administrator
VNF1
VNF2
VNF3
Virtualized Infrastructure
Virtualized Infrastructure Manager (VIM),
e.g. OpenStack
Virtual Compute
Virtual Storage
Virtual Network
Virtualization Layer
Hardware Resources

4. 5-1 Functional Block Virtualized Network Functions OpenStack Client
Consumer
VNF1
VNF2
VNF3
Administrator
Virtualized Infrastructure
OpenStack (VIM)
Virtual Compute
Virtual Storage
Virtual Network
Controller
Notifier
Resource Map
Alarm
Conf.
Virtualization Layer
Monitor
Inspector
Failure Policy
Hardware Resources

5. [Doctor] Fault management scenario
7. Switch to SBY
Applications
Consumer
1+2. Subscribe+ Response
Administrator
8. Action
6. Notification
NFVI
5c. Notify all
Controller
Controller
Notifier
Controller
Resource Map
Alarm
Conf.
5a. Update State
5b. Find Affected
5c. (alt) Notify
Monitor
Monitor
Inspector
Monitor
Failure Policy
4. Raw failure

6. [Doctor] NVFI Maintenance Scenario
7. Switch to SBY
Virtualizes Network Functions (VNF)
Consumer
1+2. Subscribe+ Response
Administrator
3. Maintenance Request
8. Action
6. Notification
NFVI
5b. Notify all
Controller
Controller
Notifier
Controller
Resource Map
Alarm
Conf.
4. Update State
5a. Find Affected
5b. (alt) Notify
Monitor
Monitor
Inspector
Monitor
Failure Policy
Maintenance Response

7. [Doctor] Implementation plan in OpenStack
Applications
Consumer
Administrator
NFVI
Nova
Notification bus
Controller
Ceilometer
Controller
Notifier
Controller
Resource Map
Alarm
Conf.
Zabbix
Monitor
(Monasca)
Monitor
Inspector
Failure Policy
Monitor

8. [Doctor] Implementation Plan in OpenStack
Applications
Consumer and Administrator
Northbound I/F
Virtualized Infrastructure
Alarm Set
Notification bus
Ceilometer
Nova
Immediate Notification
Error Injection
Zabbix
Inspector
Plugin ?

9. Ceilometer Architecture
event
Publisher
dispatcher
sample
resource
Notification-driven evaluator
notification

10. Ceilometer Architecture
event, e.g. alarm
Event-Publisher for Alarm
dispatcher
sample
resource
EXISTING (polling-based)
Notification-driven evaluator
NEW shortcut (notification-based)
notification