Before you attempt to upgrade the esxi hosts review

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Before you attempt to upgrade the ESXi hosts, review the best practices discussed in the vSphereUpgradedocumentation. VMware provides several ESXi upgrade options. Choose the upgrade optionthat works best with the type of host that you are upgrading. For more information about various upgradeoptions, see the vSphere Upgradedocumentation.PrerequisitesnVerify that you have sufficient disk space for upgrading the ESXi hosts. For guidelines about the diskspace requirement, see the vSphere Upgradedocumentation.nVerify that you are using the latest version of ESXi. You can download the latest ESXi installer fromthe VMware product download website at .nVerify that you are using the latest version of vCenter Server.nVerify the compatibility of the network configuration, storage I/O controller, storage device, andbackup software.nVerify that you have backed up the virtual machines.nUse Distributed Resource Scheduler (DRS) to prevent virtual machine downtime during the upgrade.Verify that the automation level for each virtual machine is set to Fully Automatedmode to help DRSmigrate virtual machines when hosts are entering maintenance mode. Alternatively, you can alsopower off all virtual machines or perform manual migration.Administering VMware vSANVMware, Inc. 100
Procedure1Place the host that you intend to upgrade in maintenance mode.You must begin your upgrade path with ESXi 5.5 or later hosts in the vSAN cluster.aRight-click the host in the vSphere Web Client navigator and select Maintenance Mode > EnterMaintenance Mode.bSelect the Ensure data accessibilityor Evacuate all dataevacuation mode, depending on yourrequirement, and wait for the host to enter maintenance mode.If you are using vSphere Update Manager to upgrade the host, or if you are working with a three-host cluster, the default evacuation mode available is Ensure data accessibility. This mode isfaster than the Evacuate all datamode. However, the Ensure data accessibilitymode does notfully protect your data. During a failure, your data might be at risk and you might experiencedowntime, and unexpected data loss.2Upload the software to the datastore of your ESXi host and verify that the file is available in thedirectory inside the datastore. For example, you can upload the softwareto /vmfs/volumes/<datastore>/VMware-ESXi-6.0.0-1921158-depot.zip.3Run the esxclicommand install -d /vmfs/volumes/53b536fd-34123144-8531-00505682e44d/depot/VMware-ESXi-6.0.0-1921158-depot.zip --no-sig-check. Use the esxclisoftware VIB to run thiscommand.After the ESXi host has installed successfully, you see the following message:The update completed successfully, but the system needs to be rebooted for thechanges to be effective.

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