On September 19, 2018, VMware vSphere ESXi 5.5 comes to the end of life by VMware. But what exactly does it mean? After September 19, VMware will no longer provide any new security patches, bug fixes, upgrades, upgrades, or new hardware support. You may also no longer be able to use Global Support Services (GSS) to solve your problem.
This does not mean that everything is gone, but your ESXi 5.5 environment is in a disastrous situation. VMware will keep technical support for vSphere 5.5 by September 19th, 2020. Support requests can only be opened through your service port for severity 2 and lower issues, so if you have a problem with the ESXi, your problem is yours. These items are only for support settings.
As a VMware Support and Subscription (SnS) user, you must update your ESXi 5.5 software before September 19th to get the full vSphere support. "Right to us, we need to upgrade … But what's all this for?" The vSphere platform has a very special upgrade path to follow to ensure that service interruptions do not occur throughout the process. Before considering VMware aspects, other issues should also be addressed. Let's start with the host server ESXi hardware. Confirm that the hardware is compatible with the ESXi version that you upgrade through the VMware Compatibility Guide. Take a look at the BIOS host and operating system. The host hardware vendor may also provide information about compatible ESXi versions on its website.
Even if the existing BIOS and operating system are compatible with ESXi 6.0 or higher, now is a good time to upgrade. This helps keep your hardware safe and upgrade to the recommended build levels. One of the first things that a vendor-tech engineer tells you is to upgrade your BIOS to fix the issues that you might encounter. I am experiencing this because of the many calls to "insert hardware vendor here".