#To get time and ntp info for  all esxi :

Get-VMHost | Sort Name | Select Name,  @{N="NTPServer";E={$_ |Get-VMHostNtpServer}},   Timezone,  @{N="CurrentTime";E={(Get-View $_.ExtensionData.ConfigManager.DateTimeSystem) | Foreach {$_.QueryDateTime().ToLocalTime()}}},  @{N="ServiceRunning";E={(Get-VmHostService -VMHost $_ |Where-Object {$_.key-eq "ntpd"}).Running}} ` | Format-Table -AutoSize

or 

Get-VMHost | Get-VMHostService | Where-Object {$_.key -eq "ntpd"} | select vmhost, label, Key, Policy, Running, Required |format-table -autosize

# Remove wrong NTP Server and Add correct NTP server

Get-VMHost | Remove-VMHostNtpServer -NtpServer ntp.mn Confirm:$false
Get-VMHost | Add-VMHostNtpServer -NtpServer 0.asia.pool.ntp.org

# Start NTP Service and set to Automatic

Get-VMHost | Get-VMHostService | Where-Object {$_.key -eq "ntpd" } | Start-VMHostService
Get-VMHost | Get-VMHostService | Where-Object {$_.key 

The advantage of below powerCLI is that oneliner shows as well SerialNumber (for example Dell/HP tags – very useful to find your esxi server in Datacenter physically )

Get-VMHost |Select-Object Name,NetworkInfo,Manufacturer,Model,ProcessorType, ConnectionState, PowerState, NumCpu, MemoryTotalGB, Version, Build, MaxEVCMode, @{N="SerialNumber";E={(Get-VMHostHardware -vmhost $_).SerialNumber}} | Export-Csv -notypeinformation -Path c:\temp\all-vmhosts.csv 

or more detailed report:

.'C:\Program Files (x86)\VMware\Infrastructure\PowerCLI\Scripts\Initialize-PowerCLIEnvironment.ps1'
connect-viserver vcsa.itforce.local

function Get-VMHostWSManInstance {
        param (
        [Parameter(Mandatory=$TRUE,HelpMessage="VMHosts to probe")]
        [VMware.VimAutomation.Client20.VMHostImpl[]]
        $VMHosts,
 
        [Parameter(Mandatory=$TRUE,HelpMessage="Class Name")]
        [string]
        $class,
 
        [switch]
        $ignoreCertFailures,
 
        [System.Management.Automation.PSCredential]
        $credential=$null
        )
 
        $omcBase = "http://schema.omc-project.org/wbem/wscim/1/cim-schema/2/"
        $dmtfBase = "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/"
        $vmwareBase = "http://schemas.vmware.com/wbem/wscim/1/cim-schema/2/"
 
        if ($ignoreCertFailures) {
                $option = New-WSManSessionOption -SkipCACheck -SkipCNCheck -SkipRevocationCheck
        } else {
                $option = New-WSManSessionOption
        }
        foreach 

Get-VMHost | Get-VM | Select-Object  Name, PowerState, NumCpu, MemoryMB, VMhost, @{N="Datastore";E={Get-Datastore -vm $_}}, UsedSpaceGB, ProvisionedSpaceGB, @{Name='ToolsVersion';Expression={$_.Guest.ToolsVersion}}, @{Name=’VMHostVersion’;Expression={$_.VMHost.Version}},Version, @{N="IP Address";E={@($_.guest.IPAddress[0])}}  |  Export-Csv -notypeinformation -path c:\temp\vms.csv

It could be very handy to know to what switch, what switch port your esxi network adapters are connected.

There is no standard method in PowerCLI with name “Get-VMHostNetworkAdapterCDP”.
To make it available you need in Powershell ISE
import all powerCLI modules and press enter
or use below script (replace vcsa by your own server fqdn):

.'C:\Program Files (x86)\VMware\Infrastructure\PowerCLI\Scripts\Initialize-PowerCLIEnvironment.ps1'


connect-viserver vcsa.itforce.local


function Get-VMHostNetworkAdapterCDP {
<# .SYNOPSIS Function to retrieve the Network Adapter CDP info of a vSphere host. .DESCRIPTION Function to retrieve the Network Adapter CDP info of a vSphere host. .PARAMETER VMHost A vSphere ESXi Host object .INPUTS 

Sometimes it’s useful to have opportunity to run and debug powerCLI scripts/functions from standard Powershell ISE

1. install on AdminPC powerCLI
2. open Powershell ISE
3. copy and paste into command line below:

   Import-Module VMware.DeployAutomation
   Import-Module VMware.ImageBuilder
   Import-Module VMware.VimAutomation.Cis.Core
   Import-Module VMware.VimAutomation.Common
   Import-Module VMware.VimAutomation.Core
   Import-Module VMware.VimAutomation.HA
   Import-Module VMware.VimAutomation.License
   Import-Module VMware.VimAutomation.Sdk
   Import-Module VMware.VimAutomation.Storage
   Import-Module VMware.VimAutomation.vds
   
   

if you need to have powerCLI modules in Powershell ISE always, then create under your user account powershell profile:

1. 1. new-item -path $profile -itemtype file -force
   2. powershell_ise $profile
   3. and add into your profile above commands, or just one line
      .’C:\Program Files (x86)\VMware\Infrastructure\PowerCLI\Scripts\Initialize-PowerCLIEnvironment.ps1′
   4. save your powershell profile.

If you use Veeam Backup and Replication or Veritas Netbackup non-authorized snapshot can prevent backup/replica tasks (long term snapshots as backups is one of the most common mistakes, as cause of poor performance and as Vmware datastore low free space reason and so on ). So it’s important to know quickly what VMs have snapshot and delete/merge them.

Set-ExecutionPolicy RemoteSigned
connect-viserver vcenter.org.local
get-vm | get-snapshot | fl Description, Created, VM

if you want to delete/merge existing snapshots for all VMs:

Get-VM | Get-Snapshot | Remove-Snapshot -confirm:$false