Updating ESXi 5.1u1 into ESXi 5.1u2 or later prerequisites and caveats ?

People,

I'd like to perform the inline upgrade of ESXi Update 1 hosts in a DRS cluster into 5.1 Update 2c or later, so can anyone here please share some thoughts and comments in how to do the upgrade without losing the configured information on the current ESXi ?

Since I'm running HP Blades servers, I've downloaded the VMware-ESXi-5.1.0-Update2-2000251-HP-5.69.2-Nov2014.iso is that the correct one to perform inline upgrade of the ESXi hosts ?

Do I have to upgrade the VCenter first before upgrading the ESXi hosts ?
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Senior IT System EngineerIT ProfessionalAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Do I have to upgrade the VCenter first before upgrading the ESXi hosts ?

Not for 5.1. But it's always worth updating to the same build, so I would quickly upgrade vCenter Server to 5.1 U2 or U3.

The offline upgrade, you need to obtain the offline bundle.

and perform the upgrade as per my EE Article, but use the 5.1 offline bundle.

HOW TO: Upgrade from VMware vSphere Hypervisor ESXi 5.1 to VMware vSphere Hypervisor ESXi 5.5 for FREE

offline upgrade, keeps all the configuration.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, so in this case is this the correct file:
VMware-ESXi-5.1.0-Update2-2000251-HP-5.69.2-Nov2014-depot.zip

Bundle
Or do I need to download different file ?

How do I roll back the change in case there's something went wrong with the installation or causing some other problem like driver incompatibilities or firmware issue ?
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Yes, that's the update file.

How do I roll back the change in case there's something went wrong with the installation or causing some other problem like driver incompatibilities or firmware issue ?

Restart the Host, and press Shift-R - Recovery Mode, and it rollsback, and boots the old version of ESXi!
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok,

Between these two files for the ESXi upgrade, which file is the correct one to be used for the inline upgrade on the HP Blade Servers:

HP Customized Image VMware-ESXi-5.1.0-Update2-2000251-HP-5.69.2-Nov2014-depot.zip file

ESXi 5.1 Update 2 Offline Bundle update-from-esxi5.1-5.1_update02.zip file
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