Before upgrading to ESXi 7.0, you should make sure that your hardware is compatible with the new version. You can check the VMware Compatibility Guide to see if your server hardware is listed as supported for ESXi 7.0. You should also check the compatibility of any third-party software that you may be using with ESXi 7.0.To upgrade vCenter, you should follow the VMware documentation for upgrading the vCenter Server Appliance. You will need to download the upgrade ISO file from the VMware website and mount it to the vCenter Server Appliance. From there, you can follow the upgrade wizard to upgrade vCenter.Once you have upgraded vCenter, you can then upgrade your ESXi hosts. It's recommended that you use VMware Update Manager (VUM) to perform the upgrade. You can create an upgrade baseline in VUM and apply it to your hosts. The upgrade process will involve putting your hosts into maintenance mode and rebooting them.In terms of the version, you can go straight to ESXi 7.0U3 from 6.7. However, you should always check the release notes for the version you are upgrading to and make sure you follow any specific upgrade instructions.Here are some additional tips for upgrading ESXi:* Take a backup of your vCenter and ESXi hosts before starting the upgrade process.* Make sure you have enough free space on your ESXi hosts to accommodate the new version.* Check that your network and storage settings are configured correctly before starting the upgrade.* Check for any known issues or compatibility problems that may affect your upgrade.* Consider upgrading any VMware tools installed on your virtual machines after upgrading ESXi.
Overall, it's important to plan the upgrade carefully and thoroughly test the new version before putting it into production. You might find solutions here.
