Active Directory

If you plan on integrating Active Directory authentication with ESX Service Console access using esxcfg-auth, you need to control any existing root account in Active Directory. A root account in Active Directory will natively grant root access to the ESX Service Console to whoever knows the AD root password regardless of what the root password is on the ESX host.
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vSphere Upgrade Prerequisites

VMware vSphere Upgrade Prerequisites Checklist

If you're in the design or pre-deployment phase of vSphere, this handy checklist can save your bacon. It brings to light many considerations which might otherwise be forgotten due to obscurity during a vSphere deployment. This would be a key document for a vSphere consultant to carry from site to site.

http://bit.ly/HwNJY
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VMware vSphere 4.1

What's New in VMware vSphere 4.1

Expanded List of Supported Processors - The list of supported processors has been expanded for ESX 4.1. To determine which processors are compatible with this release, use the Hardware Compatibility Guide. Among the supported processors is the Intel Xeon 7500 Series processor, code-named Nehalem-EX (up to 8 sockets).
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Player 1.0

On this day in 2005, VMware released Player 1.0, a FREE desktop hypervisor for Windows and Linux platforms. It's purpose was the running of existing VMs, however it lacked the ability to create VMs and as such it was often likened to Adobe Acrobat Reader. Shortly after its release, users engineered clever ways to create VMs to be used in Player without paying VMware for a licensed VM creation product.
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vSphere

One source reports that, in testing, vSphere was able to drive 9Gbps of iSCSI traffic through a single ESX host. It is unknown if the initiator used during the test was hardware or the VMware supplied swiSCSI adapter.
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On this day in 2007

On this day in 2007, VMware released ESX 3.5/VC 2.5 & introduced ESXi, the industry's first ultra-thin hypervisor. More than 2 months later it was discovered that a corrupted ESX 3.5 ISO image (as indicated by a false MD5SUM hash) had been released into the wild causing issues in some customer Datacenters. VMware released a new ISO correcting the problem on 2/20/08.
http://kb.vmware.com/kb/1003801

@kculw's birthday also
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N+1 cluster architecture

N+1 cluster architecture allows workload demands to be met while 1 host is non-operational. Capacity plan or scale your high availability virtual infrastructure for minimally N+1 based on a balance of peak and average load numbers. At no time do you want to dip below N+1 availability. That is a very difficult position to be in.
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