Intermittent slowness due to high network port utilization
Applies to
- ONTAP 9
- AFF and FAS systems
Issue
- Intermittent slowness is reported while accessing the share/volume.
- Applications may run fine on one LIF but the other LIF is slow on a different node, port, or ifgrp
- The network team may give an alert of 100% port utilization on a NIC
- High port utilization observed in Grafana/AIQUM monitoring tool.
- In Harvest this can be seen under the Harvest - cDOT / NetApp Detail: Network - Details view
statistics lif show
list increase in sent and receive data- The
statistics show-periodic
command with interval of 1 shows per-LIF throughput at intervals such as 1 second in the example below - The
iscsi_lif
object is required if using iSCSI, otherwise use thelif
object for CIFS/NFS
- The
Example:
cluster1::> statistics lif show cluster1 : 12/31/1969 16:00:04 Recv Sent Recv Data Recv Sent Data Sent Current LIF Vserver Packet (Bps) Errors Packet (Bps) Errors Port ------------ ---------- ------ ----- ------ ------ ----- ------ ------- node2_clus_1 Cluster 3 536 0 3 338 0 e0a node2_clus_2 Cluster 3 398 0 3 287 0 e0b node1_clus_2 Cluster 3 338 0 3 536 0 e0b node1_clus_1 Cluster 3 287 0 3 398 0 e0a Cluster::> set diag Cluster::*> statistics show-periodic -object {iscsi_lif|lif} -counter recv_data|sent_data -instance <lif> -interval 1 Cluster: iscsi_lif.iscsi: 10/27/2022 14:42:52 recv sent Complete Number of data data Aggregation Constituents -------- -------- ----------- ------------ 113.9MB 115.8MB n/a n/a