Qumulo's Networking Best Practices

IN THIS ARTICLE 

Outlines the best practices for network configuration with a QF2 cluster

REQUIREMENTS 

• Cluster running Qumulo Core
• Network Switch that meets the following criteria:
  
  • 10Gbps, 40Gbps or 100Gbps ethernet depending on platform
  • Fully non-blocking architecture
  • IPv6 capable
• Compatible network cables
• Enough ports to connect all nodes to the same switch fabric
• One static IP per node per defined VLAN

RECOMMENDATIONS

• Two redundant switches
• One physical connection per node to each redundant switch
• One LACP port-channel per node
  • Active mode
  • Slow transmit rate
  • Trunk port with a default VLAN
  • *Flow control disabled unless node has a Mellanox Connect-X 3 Pro NIC
• N-1 (N=number of nodes) floating IPs per node per client-facing VLAN
• DNS servers
• Time server (NTP)
• Firewall protocol/ports allowed for Proactive Monitoring

*NOTE: Verify if you have Mellanox Connect-X 3 Pro NICs by running the following command:

sudo mlxfwmanager

DETAILS

Networking is required for front-end and intra-node communication on Qumulo clusters.

• Front-end networking supports IPv4 and IPv6 for client connectivity and also offers support for multiple networks.
• Intra-node communication requires no dedicated backend infrastructure and shares interfaces with front-end connections.
  • Clusters use IPv6 link-local and Neighbor Discovery protocols for node discovery and intra-node communication.

Layer 1 Connectivity for QC24/QC40

• Supports 10GbE Only
• SFP+optics with LC/LC Fiber
• SFP+Passive Twinax Copper (Max length 5M)

Layer 1 Connectivity for QC104/QC208/QC260/QC360 

• Supports 40GbE
• QSFP+ transceivers
• Bidirectional (BiDi) transceivers are supported with Mellanox Connect-X 4/5 NICs
• QSFP+Passive Twinax Copper (Max length 5M)

Compatible Network Cables QC24/QC40

10 GbE Copper (SFP+) 

10 GbE Fiber (LC/LC)

NOTE: Most 850nm and 1310nm optical transceiver pairs are supported.

Compatible Network Cables QC104/QC208/QC260/QC360

IMPORTANT: Use the two left-most ports when looking at the back of the node for cabling.

40 GbE Copper (QSFP+)

40 GbE Fiber (MTP/MPO)

40 GbE Fiber (LC/LC) 

IMPORTANT: This option requires a Mellanox Connect-X 4/5 NIC.

Switch Connectivity for QC24/QC40

10G to 10G Switch

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10G to 40G Switch

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NOTE: 10G to 1G Switch is not supported.

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Switch Connectivity for QC104/QC208/QC260/QC360

40G to 40G Switch

IMPORTANT: The BiDi option and long range optical transceivers require a Mellanox Connect-X 4/5 NIC.

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Unsupported configurations for 40G to 10G Stepdown

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Unsupported Configurations for 40G to 10G Stepdown to 40G Switch

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Unsupported Configurations for 40G to 10G Stepdown to 10G Switch

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Layer 2 Connectivity & Interface Bonding

Interface Bonding is utilized to combine multiple physical interfaces into a single logical interface. Bonding enables built-in redundancy so that a logical interface can survive a physical interface failure. In the case of LACP, additional bond members increase the aggregate throughput. Note that LACP is Qumulo's default network bonding and preferred configuration.

Below are the different types of supported bonding for active port communication:

• Link aggregation control protocol (LACP)
  • Active-active functionality
  • Requires switch side configuration
  • May span multiple switches when utilizing multi-chassis link aggregation
• Active-backup NIC bonding
  
  • Automatic fail-back
  • Does not require switch side configuration
  • All active ports must reside on the same switch 

RESOLUTION 

You should now have an overall understanding of networking best practices with a QF2 cluster

ADDITIONAL RESOURCES

Configure IPv6 in Qumulo Core

Configure LACP in Qumulo Core

Connect to Multiple Networks in Qumulo Core

QQ CLI: Networks and IP Addresses 

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