With Operation Manager 2016 we finally have the ability to Schedule maintenance for Objects.
Doing that in GUI is pretty straitght forward, altough i have seen some blog post on issues With conflicting maintenance schedules. Besides scheduling maintenance mode in the GUI we have gotten some New PS CMDlet’s to manage maintance schedules.

One of them are New-SCOMMaintenanceSchedule.

Based on this i have created the following script wich will take parameters for servername, comments, start and end date before creating a New maintenance Schedule With the supplied server Objects (Linux/Windows)

Feel free to use and please give me feedback on improvements and bugs. Beware that this Version has some limitations and little error handling.

<#

.SYNOPSIS
    System Center Operations Manager 2016 Schedule maintenance mode script.

.DESCRIPTION
    Adding a SCOM 2016 maintencance shedule to specified servers. Works with Linux and Windows servers.

.EXAMPLE
    New-SCOMServerMaintenanceSchedule.ps1 -ServerName SERVER01 -start '01/01/2017 18:30' -end '02/01/2017' -comment "your comment"

    Adds a new maintenance schedule with server SERVER01 starting Jan. 1. 2017 18:30 and ending Jan 2. 2017 00:00

.EXAMPLE
    New-SCOMServerMaintenanceSchedule.ps1 -ServerName SERVER01 -start NOW -end 02/01/2017 -comment "your comment"

    Adds a new maintenance schedule with server SERVER01 starting NOW (adding 30 seconds by default) ending Jan 2. 2017

.EXAMPLE
    New-SCOMServerMaintenanceSchedule.ps1 -ServerName SERVER01 -start NOW -end 02/01/2017 -comment "your comment" -ManagementServer OPSMGR123.DOMAIN

    Adds a new maintenance schedule with server SERVER01 starting NOW (adding 30 seconds by default) ending Jan 2. 2017 connecting to specific management server

.NOTES
    Author: Martin Ehrnst /Intility AS
    Date: November 2016
    Version 0.9 Beta
    This version has a default of non reccuring schedule and has a hard coded reason for maintenance. You can change this by altering the script directly
    Use at own risk

#>

param(
[Parameter(Mandatory=$True)]
[string[]]$ServerName,
[Parameter(Mandatory=$True)]
[string]$ManagementServer = 'localhost',
[Parameter(Mandatory=$True)]
[string]$start,
[Parameter(Mandatory=$True)]
[string]$End,
[Parameter(Mandatory=$True)]
[string]$Comment)

#####FUNCTIONS#######
function Input-Date{
param(
[string]$dateTime)

Do
{    
$Inputdate = $dateTime
if ($Inputdate -eq "NOW"){
    $Inputdate = (Get-Date).AddSeconds(30)}
Else{
$Inputdate = $Inputdate -as [datetime]}

if (!$Inputdate) { "Not A valid date and time"
break}

} while ($Inputdate -isnot [datetime])

$Inputdate
}

Function Get-SCOMServers{
Param(
[STRING[]]$Name
)
#Getting servers from Windows and Linux Computer Class
foreach ($O in $Name){
$Server = Get-ScomClass -id 'e817d034-02e8-294c-3509-01ca25481689','d3344825-d5d1-2656-852e-1053269703c0' | Get-SCOMClassInstance | where {$_.DisplayName -like "$o.*"}
if(!$Server){
Write-Host "Could not find server. Please check input"
break}
else{
$server}
}
}

######END FUNCTIONS####

#Maintenance start time
$InputStart = Input-Date -dateTime $start -ErrorAction Stop

#Maintenance end time
$InputEnd = Input-Date -dateTime $End -ErrorAction Stop

#Checking if module is loaded. if not load and connect to MS
$Module = Get-Module -Name OperationsManager
if (!$Module){
Import-Module OperationsManager}

New-SCOMManagementGroupConnection -ComputerName $ManagementServer

$Object = (Get-SCOMServers -Name $ServerName).ID
[STRING]$SheduleName = $ServerName + ":" + "Created with Script"
$Duration = (New-TimeSpan -Start $InputStart -End $InputEnd).TotalMinutes
$Reason = 'PlannedApplicationMaintenance'
$Frequency = '1' #1 Equals no frequency or 'once'

try{
New-SCOMMaintenanceSchedule -Name $SheduleName -Enabled $true -MonitoringObjects $Object -ActiveStartTime $InputStart -ActiveEndDate $InputEnd -Duration $Duration -ReasonCode $Reason -FreqType 1 -Comments $Comment -ErrorAction Stop
}
catch{
write-host "Something went wrong"
$_.Exception.Message}