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CONTAP-100757: High latency reported on SSD-NVM drives in MetroCluster IP using Cisco 9336C-FX2 shared switches

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ontap-9
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metrocluster
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Issue

High latency might be observed on NVMe drives of NS224 storage shelves in MetroCluster IP configurations that use Cisco Nexus 9336C-FX2 shared switch configurations.
EMS log:
[ClusterA-01: disk_latency_monitor: shm.ssd.threshold.ioLatency:notice]: SSD e5a.03.0.11 has exceeded the expected block latency in the current timeframe with an average latency of 1828 us and an average utilization of 8 percent. The next highest SSD latency: 1684 us. Disk e5a.03.0.11 Shelf 3 Bay 11 [NETAPP X4011WBORA3T8NTF NA51] S/N [22106S123456] UID [0014EE83:0B31A280:00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000]
Switch log might report:
%ACLQOS-SLOT1-2-ACLQOS_UNEXPECTED_PFC_FRAMES: Ethernet1/17 received 4 unexpected PFC frames for COS 3
%ACLQOS-SLOT1-2-ACLQOS_UNEXPECTED_PFC_FRAMES: Ethernet1/18 received 2 unexpected PFC frames for COS 3

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