Networking

Dedicated SAN: Isolating iSCSI & NFS Traffic

Network Design diagram · made in Skemio

Network architecture diagram showing VM hosts connecting to isolated SAN storage switches using jumbo frames and dual paths to an all-flash array.
Network architecture diagram showing VM hosts connecting to isolated SAN storage switches using jumbo frames and dual paths to an all-flash array.
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What it shows

  • Jumbo frames (MTU 9000) reduce CPU overhead and header bloat for high-volume storage.
  • Priority-based Flow Control (PFC) guarantees lossless Ethernet for iSCSI/NFS queues.
  • Air-gapping or dedicated VLAN separation prevents user traffic spikes from causing storage latency.

The takeaway

Lossless storage demands isolated fabric switches and MTU 9000 end-to-end to prevent dropped frames.

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