Prevent corruption of the ESXi bootable SD card

To activate this feature the following advanced settings must be changed on each ESXi host:

  • Set the advanced ToolsRamdisk option to 1 by using this command:

    [code language=“text”]esxcli system settings advanced set -o /UserVars/ToolsRamdisk -i 1 [/code]

  • After changing the setting reboot the host.

I created a simple PowerCLI script that sets the advanced setting `toolsRamdisk` value to ‘1’ on all the ESXi hosts.

[code language=“PowerShell”] <# Author : Ivo Beerens Blog : Twitter : @ibeerens Pre-requisite : ESXi 6.0 U3 Set : Set UserVars.ToolsRamdisk to the value 1 #>

Get-Module -ListAvailable VMware* | Import-Module Connect-VIServer Foreach ($vmhost in Get-VMHost | where {$_.ConnectionState -eq “Connected”}) { Write-Host “Host: $($” -ForegroundColor Green Get-AdvancedSetting -Entity $vmhost -Name UserVars.ToolsRamdisk | Set-AdvancedSetting -Value ‘1’ -Confirm:$false } [/code]

After running this script all the ESXi hosts must be rebooted. More information: VMware KB: High frequency of read operations on VMware Tools image may cause SD card corruption (2149257), Link

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