High latency when performing delete operations due to high WAN RTT

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Visibility:: Public

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Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

ONTAP 9
FlexCache volume

Issue

FlexCache volumes experience high latency when performing delete operations on source volumes. The latency is significantly higher for files previously read from the cache compared to files not accessed via the cache.
High WAN RTT between origin and cache site.

Example:

::>cluster peer ping -count 30 Node: demo_cluster-01 Destination Cluster: cache_cluster Destination Node IP Address Count TTL RTT(ms) Status ---------------- ---------------- ----- ---- ------- ------------------------- cache_cluster_n1 10.58.72.237 1 48 127.097 interface_reachable cache_cluster_n1 10.58.72.237 2 48 147.748 interface_reachable cache_cluster_n1 10.58.72.237 3 48 127.316 interface_reachable cache_cluster_n1 10.58.72.237 4 48 156.941 interface_reachable cache_cluster_n1 10.58.72.237 5 48 128.397 interface_reachable cache_cluster_n1 10.58.72.237 6 48 127.136 interface_reachable cache_cluster_n1 10.58.72.237 7 48 159.583 interface_reachable cache_cluster_n1 10.58.72.237 8 48 128.361 interface_reachable cache_cluster_n1 10.58.72.237 9 48 340.555 interface_reachable cache_cluster_n1 10.58.72.237 10 48 171.811 interface_reachable cache_cluster_n1 10.58.72.237 11 48 211.061 interface_reachable