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<#
.SYNOPSIS
A script to unmount and detach datastores from VMWare vCenter.
.DESCRIPTION
This script unmounts datastores from vCenter if they are in maintenance mode, reside in the specified folder, and the name matches the specified regular expression.
The VMware PowerCLI module is required and a connection to vCenter (Connect-VIServer) must be established before running the script.
.EXAMPLE
Unmount-Datastores.ps1 -VIServer vcenter.domain.local -NameRegex "Datastore\d\d" -Folder "Unmount"
This command will unmount and detach datastores in the vcenter.domain.local vCenter that reside in the datastore folder named Unmount with names that -match the regular expression "Datastore\d\d".
.NOTES
Author: Luke Arntz
Date: May 13, 2019
.Link
https://blue42.net
.Link
https://github.com/larntz/PowerCLI
#>
Param(
# Specifies a vCenter server name.
[Parameter(Position=0,mandatory=$true)]
[string]$VIServer,
# Specifies a datastore folder name.
[Parameter(Position=1,mandatory=$true)]
[string]$Folder,
# Specifies a regular expression to -match datastore names.
[Parameter(Position=2,mandatory=$true)]
[string]$NameRegex
)
$MaintenanceModeDatastores = Get-Datastore -Location (Get-Folder -Name $Folder) -Server $ViServer | where {$_.State -eq "Maintenance" -And $_.Name -match $NameRegex}
$UnMounted = @()
foreach ($MaintenanceModeDatastore in $MaintenanceModeDatastores)
{
$datastoreHostInfo = Get-VmHost -Server $viserver -Id ($MaintenanceModeDatastore.ExtensionData.Host.Key)
$CanonicalName = $MaintenanceModeDatastore.ExtensionData.Info.Vmfs.Extent[0].Diskname
Write-Host "Processing $($MaintenanceModeDatastore)..."
foreach ($vmHost in $datastoreHostInfo)
{
$unmount = [PSCustomObject]@{
Datastore = $MaintenanceModeDatastore.Name
DsUuid = $MaintenanceModeDatastore.ExtensionData.info.Vmfs.uuid
LunUuid = (Get-ScsiLun -Server $viserver -VmHost $vmHost | where {$_.CanonicalName -eq $CanonicalName}).ExtensionData.Uuid
Host = $vmHost.name
CanonicalName = $CanonicalName
UnmountTime = $null  
}
$hostMountInfo = $MaintenanceModeDatastore.ExtensionData.Host | Where {$_.Key -eq $VMHost.Id}
if($hostMountInfo.MountInfo.Mounted -eq "True")
{
Write-Host "Unmounting $($unmount.Datastore) from host $($VMHost.Name)"
$hostStorageSystem = Get-View $VMHost.Extensiondata.ConfigManager.StorageSystem
$hostSTorageSystem.UnmountVmfsVolume($unmount.DsUuid)
$hostStorageSystem.DetachScsiLun($unmount.LunUuid)
} else {
write-host "$($unmount.Datastore) not mounted on $($VMhost.Name)"
}
$unmount.UnmountTime = Get-Date -Format "s"
$UnMounted += $unmount
}
}
$UnMounted
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