I have 10 Dell Poweredge R630s running VMWare ESXI (Dell Customised). We patched 9 of them with all stable patches 2 weeks ago. Since then, most of them (different numbers on different days, always between 5-9 of them) go incommunicado and we receive alerts from our Zabbix monitoring system between 7:30-8:30 AM PST EVERY OTHER day. The hosts are NOT down or unreachable; I can get to them in vCenter and the guests are up and reachable fine. This system has been in place for several years and we’ve never seen this before the latest round of patches. Any thoughts as to what could be happening?
We have 1 of our 10 hosts which is unpatched due to a hardware dependency and that never goes down, so we do not believe there is an issue with our zabbix system. We believe SNMP is going down at the same time every day. Additionally we have confirmed ping and vsphere access during “downtime,” so the network is not an issue.
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