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First place I would look at is dell, see if there is no fan firmware update advisory for running ESXi 4.1
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First place I would look at is dell, see if there is no fan firmware update advisory for running ESXi 4.1

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(slap to the head). I forgot that under ESXi, that the OEM providers would be providing customized versions of ESXi and their utilities. Will try it and let you know what I find. 
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(slap to the head). I forgot that under ESXi, that the OEM providers would be providing customized versions of ESXi and their utilities. Will try it and let you know what I find.

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We have a Dell m1000e enclosure that is filled with 8 Dell M710 blade servers. <br />
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4 of the blades are running ESX 4.0 u1. The fans associated with those blades run quietly. The 4 other blades which we have have configured to run under ESXi 4.1u1 run like there is no OS on those blades (they are loud).<br />
<br />
What are we missing in getting those blades running ESXi 4.1u1 to run like the older ESX 4.0 blades rather than sounding like they would when starting them up all of the time. They ran quietly when they ran ESX 4.0u1?
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We have a Dell m1000e enclosure that is filled with 8 Dell M710 blade servers. 

4 of the blades are running ESX 4.0 u1. The fans associated with those blades run quietly. The 4 other blades which we have have configured to run under ESXi 4.1u1 run like there is no OS on those blades (they are loud).

What are we missing in getting those blades running ESXi 4.1u1 to run like the older ESX 4.0 blades rather than sounding like they would when starting them up all of the time. They ran quietly when they ran ESX 4.0u1?

Dell m1000e enclosure loud running ESXi 4.1 U1

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.