Hello,
We have esxi upgrade activity from esxi 5.1 to esxi 6.0 u3 and in this case we are moving one by on esxi host from one VC to another vc which is version 6.
In this case we are moving VMs from distributed switch to standard switch and then adding this host to target VC.
One day we finishes adding all 8 esxi host all in standard switch with 5.1 version but suddenly on midnight one of the esxi host started loosing network connectivity.
We observed it was not consistent it comes online then again goes disconnected it happened for long time and then in the morning whenever the host comes online we moved all impacted VMs to other hots. later on the same host started working properly without doing anything from esxi end.
I dont understand why it was happened when we asked network team they said there is no issue from network end.
I have below questions:
1) why suddenly the host starred experiencing network connectivity and that is intermittently.
2)If there is hardware issue then how it solved when we upgraded to esxi 6 and moved to distributed switch.
3) Is there any issue if we move host from distributed (VSM) switch to standard switch.
4) Is there any challenges with network speed so therefore there was ping drop-out.
I feel there something wrong from network end but i cant prove, but yes we have snapshot where frequently ping response was down.
Please can you guys check and let me know something which can be identified.
Thank You,
Bharat