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hasi123
Contributor
Contributor

Some VMs loosing network connection intermittently

We are having an issue in our production environment that some VMs intermittently going out of network. If we migrate (vMotion) to another host the VMs will become active (connected) again.

This issue has been happening since we have updated our esxi hosts to  ESXi 6 update 3 build 5224934

But this issue occurs only on one particular cluster. Even though we have updated Esxi hosts in other clusters too.

Same VMs are repeating: loosing network connection again after few days or next day.

As recommended by HPE VMware support, we have updated VMware tools version from 9.. to 10.

Environment Detials:

HP Blade gen8

Vcenter 6

Esxi 6

open-vm-tools

GuestOS : Centos 6

Any help very much appreciated. Thanks

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Nick_Andreev
Expert
Expert

Is it specific VMs or all VMs on this cluster? What are the OS versions on these VMs?

Check if you're using vmxnet3 adapters. There's historically been some issues with E1000.

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Stanley_
Enthusiast
Enthusiast

just start with basics...

- physical connection to blades? any dropped packets on switches/ portchannels /ports etc..

- ESXTOP any dropped packets on pNIC and VM's

- vNIC dropped packets/ crc errors etc..

in the past we had similar issue, but not after upgrades. Just a few VM's dont see each other on different hosts. After days of investigation(opened cases with network and virtualization vendor) and  we find out that there is one bad optical cable from chassis to switch. And the rest (3) is good. We were using IP hash as load balancing method.

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