Author: John Borhek

John Borhek (VCP 3-6.5) is the IT Director and Lead Solutions Architect at VMsources Group Inc. John has soup-to-nuts experience in Mission Critical Infrastructure and GxP systems, specializing in Datacenter Infrastructure Management (DCIM) and Operational Technology (OT) all over the United States and throughout the Americas.

OVF and OVA formatted Virtual Appliances

The Open Virtual machine Format (OVF) originally came about in 2007 as the result of a proposal by vendors (VMware, HP, Dell and others) to the Distributed Management Task Force (DTMF), the goal being to create an open standard for interchangeability (portability) of Virtual Machines between hypervisors. VMware was an early and enthusiastic adopter of
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Timekeeping on ESXi

Timekeeping on ESXi Hosts is a particularly important, yet often overlooked or misunderstood topic among vSphere Administrators. I recall a recent situation where I created an anti-affinity DRS rule (separate virtual machines) for a customer’s domain controllers. Although ESXi time was correctly configured, the firewall had been recently changed and no longer allowed NTP. As
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