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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
Introduction
Ethernet packet
Ethernet payload
Jumbo frames
IP packet overhead
Data payload to Ethernet frame efficiency
ICMP and MTU with OneFS
OneFS MTU commands
VLAN and interface MTU
Confirming transmitted MTU
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

  • A Maximum Transmission Unit (MTU) is the largest packet size or frame that can be sent along a link. The MTU is specified in octets and is used by TCP to determine the maximum size of a packet per transmission. A large MTU provides less overhead because packet headers and acknowledgments are not consuming space and bandwidth. However, this could lead to retransmissions or drops if a hop does not support it. On the contrary, a small MTU is not as efficient as overhead increases with packet headers and acknowledgments.

    Generally speaking, the MTU across the Internet is 1,500 bytes. As such, most devices limit packet size to roughly 1,472 bytes, allowing for additional overhead and remaining under the 1,500-byte limit. Additional overhead might be added as the packet goes through different hops. The IEEE 802.3 standard also specifies 1,500 bytes as the standard payload.