NS0-157 · Question #65
Which of these correctly describes single-node clusters?
The correct answer is C. They have no cluster LIFs. Single-node clusters run Cluster-Mode on a single node and do not require cluster LIFs because there is no inter-node cluster network traffic to manage.
Question
Which of these correctly describes single-node clusters?
Options
- AThey support storage failover
- BThey support nondistruptive upgrade
- CThey have no cluster LIFs
- DThey are identical to one-node clusters
How the community answered
(50 responses)- A2% (1)
- B8% (4)
- C88% (44)
- D2% (1)
Why each option
Single-node clusters run Cluster-Mode on a single node and do not require cluster LIFs because there is no inter-node cluster network traffic to manage.
Storage failover requires an HA pair of at least two nodes so one partner can take over the other's storage, which a single-node cluster cannot provide.
Non-disruptive upgrades in a cluster rely on rolling takeover and giveback across HA pairs, which is impossible with only one node.
Cluster LIFs exist solely to handle node-to-node communication over the cluster interconnect network. In a single-node cluster there are no peer nodes to communicate with, so ONTAP does not create or require cluster LIFs. This is a defining architectural difference from multi-node clusters where each node must have at least one cluster LIF.
A single-node cluster is a Cluster-Mode deployment and differs architecturally from a standalone 7-Mode one-node system in configuration, management, and supported features.
Concept tested: Single-node cluster architecture and LIF requirements
Source: https://docs.netapp.com/us-en/ontap/networking/create_lifs.html
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