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PowerScale: Network Design Considerations
Executive summary Network architecture design Latency, bandwidth, and throughput Ethernet flow control SyncIQ considerations Quality of Service (QoS) Software-Defined Networking PowerScale OneFS ports SmartConnect considerations Ethernet, MTU, and IP overhead Access Zones best practices Source-Based Routing considerations
Overview
Source-Based Routing and DNS
Isilon 6th generation 1 GbE interfaces Intelligent Platform Management Interface IPv6 OneFS host-based firewall Network troubleshooting Appendix A: Supported network optics and transceivers Appendix B: Technical support and resources

Source-Based Routing and DNS

Source-Based Routing and DNS

  • As discussed earlier in this paper, it is important to understand the path a specific session traverses throughout the network hierarchy. Having SBR configured on a cluster also affects how the cluster creates sessions with other hosts, such as a DNS server.

    In certain environments, PowerScale clusters with SBR enabled and multiple SmartConnect SIP (SSIP) addresses, have experienced excessive latency with DNS responses. As mentioned previously in this paper, keeping latency minimal is imperative through any transaction and the delayed DNS responses could affect DNS-dependent workflows. The prior section explained how SBR dynamically assigns a gateway. In this instance, the route to the DNS server is changed as the session originated on a different interface based on the SSIP being addressed.

    To prevent the additional latency with DNS responses when SBR is enabled with multiple SSIP addresses, consider the following recommendations:

    • If a single access zone is configured to have multiple SmartConnect zones and multiple subnets with SBR enabled, use a single SSIP.
    • If a cluster is using a single DNS server, use a single SSIP.
    • If multiple access zones are required within a single groupnet, use a single SSIP.