Monitoring ESX is tricky because it uses net-snmp to report the data, but because of some decision VMware made, native snmp polling of the net-snmp doesn't give the right answer. In Orion NPM 9.0, we made some changes to more accurately report ESX memory. NPM 9.0 will ship early in Q3.
It is not just ESX that has this problem, it just happens to be my greatest concern. There are other Linux devices that have this same issue.
Part 2. Are there any opportunities for Fiber-Channel and SAN monitoring?
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