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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
Introduction
SmartConnect network hierarchy
Load balancing
Static or dynamic IP address allocation
Dynamic failover
Protocols and SmartConnect allocation methods
IP address quantification
SmartConnect service name
SmartConnect node suspension
SmartConnect and Reverse DNS
DNS delegation best practices
SmartConnect DNS, subnet, and pool design
SmartConnect in isolated network environments
DNS and time-to-live
Flushing DNS and OneFS
Where the SmartConnect Service IP runs (pre OneFS 8.2)
SmartConnect Multi-SSIP
Other SmartConnect considerations
Ethernet, MTU, and IP overhead Access Zones best practices Source-Based Routing considerations 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

Introduction

Introduction

  • This section provides considerations for using the PowerScale SmartConnect load-balancing service. The general IP routing principles are the same with or without SmartConnect.

    SmartConnect acts as a DNS delegation server to return IP addresses for SmartConnect zones, generally for load-balancing connections to the cluster. The IP traffic involved is a four-way transaction shown in the following figure:

    Figure 8.   SmartConnect DNS delegation steps

    In the preceding figure, the arrows indicate the following steps:

    1. Blue arrow (step 1): The client makes a DNS request for sc-zone.domain.com by sending a DNS request packet to the site DNS server.
    1. Green arrow (step 2): The site DNS server has a delegation record for sc-zone.domain.com and sends a DNS request to the defined nameserver address in the delegation record, the SmartConnect service (SmartConnect Service IP Address).
    2. Orange arrow (step 3): The cluster node hosting the SmartConnect Service IP (SSIP) for this zone receives the request, calculates the IP address to assign based on the configured connection policy for the pool in question (such as round robin), and sends a DNS response packet to the site DNS server.
    3. Red arrow (step 4): The site DNS server sends the response back to the client.