SNMP has been made more strait forward in vCLI5.1. We can now make all configuration changes in ESXCLI.
The namespace to set the SNMP server settings are under esxcli system snmp.
We can use the set get and test methods, but the methods are strait forward.
DirectPath I/O is available from vSphere 4.0 forward. It uses Intel VT-d and AMD-Vi to allow guests to directly access hardware devices. When using DirectPath a VM can’t use vMotion, snapshots or any feature which leverage them. The directly allocated device isn’t available to other VMs. The only change with vSphere5 is that you can vMotion a VM provided it is in a supported hardware configuration that allows that direct path to the host hardware to persist.
The benefit of DirectPath is very specific. You can offload CPU cycles that the VMM would need to perform to schedule those resources and expose hardware component features that are not yet available through virtualized drivers or that ESXi cannot recognize. There is a performance benefit available in some cases.
The tradeoff is to nearly nullify the benefit of agility inherent in virtualization, effectively tying a guest to a host.
There is a KB describing the configuration process.
I am starting to put together my notes for the VCAP5-DCA exam.
Some of this will be restated information from other sources, and I’ll try to site references where possible, but because I’m really just collecting my own thoughts here, your mileage may vary.
The plan is to review all of the information in the Blueprint http://mylearn.vmware.com/mgrReg/plan.cfm?plan=47316&ui=www_cert
I will post a description of each topic and notes about how to affect the topic. My goal is to have identified places where I rely heavily on documentation and would be hindered in the exam.
After I note each category I will take some highlights and recreate them in a video. This is new territory for me so I may not be quick to get these posted.
Let’s see how long this takes me to really get done.