Moving VM out from DS

#connect the vCenter
Connect-VIServer #####-User ######-Password ######
#function for VM migration with required DS
function migratios($vm,$DS_Name_source)
{
#get the VM and ESX details 
$each_vm = Get-View -ViewType virtualmachine -Filter @{"name" = "$vm"}
$esx1 = Get-VM $vm | Get-vmhost
$esx = $esx1.name
#get the Disk details and teh disk size
$disk = Get-VM $vm |Get-HardDisk | where {$_.Filename -like "*$DS_Name_source*"}
$size = Get-VM $vm |Get-HardDisk | where {$_.Filename -like "*$DS_Name_source*"} | select capacityGB
#get the total size(GB) of the disk for the one/currect VM  which preset in the DS
foreach ($size1 in $size)
{
$size11 = $size1.CapacityGB
$sixe_total = $size11 + $sixe_total
}
#calculate the total size you need to migrate the disk
$require_size = $sixe_total + 400
#get the datastore according your required space and if some paticular condition 
$oo1 = Get-VMHost $esx | Get-Datastore | where {($_.FreeSpaceGB -gt "$require_size") }
foreach($ds_name in $oo1)
{
}
#if there is no DataStore preset having total free space required then check the datastore space and migrate different disk in different datastore
if($oo1 -eq $null)
{
foreach($disk1 in $disk)
{
$require = $disk1.CapacityGB
$require1 = $require + 200
$capacity  = Get-VMHost $esx | Get-Datastore | where {($_.FreeSpaceGB -gt "$require1") }
$capacity = $capacity | Get-Random
Move-HardDisk -HardDisk $disk1 -datastore $capacity  -Confirm:$false
#Start-Sleep 300
}
}
#if the total size is less than 150GB
if($require_size -lt 150)
{
foreach($disk1 in $disk)
{
Move-HardDisk -HardDisk $disk1 -datastore $ds_name  -Confirm:$false
#Start-Sleep 300
}
}
#if the total size is greater than 150GB
if($require_size -gt 150)
{
foreach($disk1 in $disk)
{
Move-HardDisk -HardDisk $disk1 -datastore $ds_name  -Confirm:$false
#Start-Sleep 350
}
}
}
# funtion to get teh vms in a paticular datastore
function migration([string]$DS_Name123,[string]$ESX_Name)
{
$oo = Get-VMHost $ESX_Name | Get-Datastore | where {$_.name -eq $DS_Name123}
foreach ($ds in $oo)
{
$vm = $ds | Get-VM
foreach ($each_vm in $vm)
{
$each_vm1 = $each_vm.name
#call the VM migration fuction
migratios $each_vm1 $DS_Name123
}
}
}
#call the migation function and give the DS name and respective ESX name
migration "Nadaypur#####" "daye##########"
migration "Nadaypur#####" "dayesx########"
Disconnect-VIServer $global:DefaultVIServers -Confirm:$false