more in this VMware PowerCLI Blog post

Components used in the following examples:

• Windows with installed vCenter Server: myWinvCenter01
• vCenter deployed as VCSA: myVCSA01
• User in vCenter to connect with: myvCenterUser
• Related user password: myvCenterPassword

Connect-VIServer myWinvCenter01
#...
Disconnect-VIServer -Force -Confirm:$false

Credentials have to be stored once per Windows User:

New-VICredentialStoreItem -Host myVCSA01 -User myvCenterUser -Password myvCenterPassword

Connect-VIServer -Server myVCSA01 -User myvCenterUser
#...
Disconnect-VIServer -Force -Confirm:$false

(Get-EsxCli -VMHost myVMHost).hpssacli.cmd("ctrl slot=0 pd all show")

SSH (TSM-SSH) is used in the following examples on host myHost.

Start-VMHostService -HostService (Get-VMHost myHost | Get-VMHostService | Where { $_.Key -eq "TSM-SSH" } )

Stop-VMHostService -HostService (Get-VMHost myHost | Get-VMHostService | Where { $_.Key -eq "TSM-SSH" } ) -Confirm:$false

Get-VMHost myHost | Get-VMHostService | Where { $_.Key -eq "TSM-SSH" }

if($Global:DefaultVIServer) {
    "Connected."
} else {
    "Not connected."
}