3 Virtualization Facilities (Host OS, Hypervisor)
3.1 Requirements on Host OS and Hypervisor and Storage
Requirements:
- The hypervisor should support distributed HA mechanism
- Hypervisor should detect the failure of the VM. Failure of the VM should be reported to
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the VIM within 1s
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- The hypervisor should report (and if possible log) its failure and recovery action.
and the destination to whom they are reported should be configurable.
- The hypervisor should support VM migration
- The hypervisor should provide isolation for VMs, so that VMs running on the same
hardware do not impact each other.
- The host OS should provide sufficient process isolation so that VMs running on
the same hardware do not impact each other.
- The hypervisor should record the VM information regularly and provide logs of
VM actions for future diagnoses.
- The NFVI should maintain the number of VMs provided to the VNF in the face of failures.
I.e. the failed VM instances should be replaced by new VM instances
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3.2 Requirements on Middlewares
Requirements:
- It should be possible to detect and automatically recover from hypervisor failures
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without the involvement of the VIM
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- Failure of the hypervisor should be reported to the VIM within 1s
- Notifications about the state of the (distributed) storage backends shall be send to the
VIM (in-synch/healthy, re-balancing/re-building, degraded).
- Process of VIM runing on the compute node should be monitored, and failure of it should
be notified to the VIM within 1s
- Fault detection and reporting capability. There should be middlewares supporting in-band
reporting of HW failure to VIM.
- Storage data path traffic shall be redundant and fail over within 1 second on link
failures.
- Large deployments using distributed software-based storage shall separate storage and
compute nodes (non-hyperconverged deployment).
- Distributed software-based storage services shall be deployed redundantly.
- Data shall be stored redundantly in distributed storage backends.
- Upon failures of storage services, automatic repair mechanisms (re-build/re-balance of
data) shall be triggered automatically.
- The storage backend shall support geo-redundancy.