Latency observed on VM's residing on vSAN cluster and backup operations may report slow.

Products

• VMware vSAN

Issue/Introduction

• Latency observed on vSAN cluster under "vSAN cluster>Monitor>Performance"

• Backup operation like taking backup and restoration reports to be slow.

Environment

VMware vSAN (All Versions)

Cause

This could be due to the network connectivity issue between the hosts using vSAN network. 

• Network performance tests may show poor bandwidth between the data nodes.

 

• vmkping test shows packet loss between between the working and problematic data node.

[root@Hostname:~] vmkping -I vmk1 ###.###.###.### -d -s 8972 -c 500

PING ###.###.###.### (###.###.###.###): 8972 data bytes

8980 bytes from ###.###.###.###: icmp_seq=0 ttl=64 time=0.116 ms

8980 bytes from ###.###.###.###: icmp_seq=1 ttl=64 time=0.128 ms

8980 bytes from ###.###.###.###: icmp_seq=2 ttl=64 time=0.112 ms

--- ###.###.###.### ping statistics ---

500 packets transmitted, 451 packets received, 9.8% packet loss

round-trip min/avg/max = 0.087/0.108/0.266 ms

 

Resolution

Engage network vendor to further investigate the issue.