This white paper presents a detailed troubleshooting case involving an Isilon scale-out storage cluster that became inaccessible after administrators enabled additional VLAN tagging. Because the shared storage environment supported large scientific datasets, even a short outage affected many users and required rapid diagnosis. Engineers inserted a portable ProfiShark TAP directly into the data-center link to capture traffic without depending on switch mirroring or changing the production configuration. Packet analysis exposed how tagged and untagged frames, VLAN settings, switch trunks, and cluster interfaces interacted during the failure. The investigation helped separate network behavior from storage-system configuration and identify the source of lost connectivity. The paper also review

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