Powershell – Tech Llama

vSphere PowerCLI: Moved your ISO datastore ? Reconnecting your CD-ROM drives

We recently moved our ISO store from a legacy NFS server to our main NFS filer.

The first task was copying the actual files, which can be done via any machine that has both datastores mounted (with read-write access to the destination store).

The more significant job is reconfiguring the VMs to use the copies of the ISOs in the new datastore.

Here’s the PowerCLI script I used:

```
#
```

# Disconnect all CD/DVD ISOs on a particular datastore and reconnect them to the new datastore

```
#
```
```
$myvcenter = "myvcenter.host.net"
```
```
$mydatacenter = "BigDC1"
```
```
$originalISOstore = "MyFirstISOstore"
```
```
$finalISOstore = "MuchBetterISOstore"
```
```
 
```
```
Connect-VIServer $myvcenter
```
```
 
```

(Get-VM -Location: (Get-Datacenter $mydatacenter)) | ForEach ( $_ )

```
	{ 
```
```
	$myDrive = Get-CDDrive $_
```

	if ($myDrive.IsoPath -match "\["+$originalISOstore+"\]")

```
		{
```

		Set-CDDrive -CD $myDrive -IsoPath ($myDrive.IsoPath -replace $originalISOstore, $finalISOstore) -Confirm:$false

```
		} 
```
```
	}
```

Disconnect-VIServer $myvcenter -confirm:$false

It’s fairly self-explanatory.

The biggest caveat with this is that it assumes that the source and destination stores have the same structure, but it wouldn’t be difficult to amend it to change the destination path slightly.

Add multiple datastores to multiple vSphere hosts

In large vSphere environments it can be very tedious to add multiple NFS datastores to lots of hosts.
PowerCLI comes to the rescue as usual.

I needed to add some datastores to all the clustered hosts in a single datacenter, but to skip our non-clustered standalone hosts which are used for backups.

A bit of PowerCLI which should be fairly self-explanatory:

```
#
```

#  Add Datastores to all hosts in all clusters in a specified datacenter

#  If a host isn't in a cluster it won't get the datastore

#  Easy enough to change to do all hosts in a datacenter, all in vCenter etc

```
#
```

#  Change the value below to point it to your own vCenter

```
$myvCenter = "vcenter.example.com"
```
```
 
```

# Array of arrays below holds NFS-hostname, NFS-path and Datastore name, should be easy to add to

```
$nfsArray = @(
```

			  @("nfsserver1","/vol/nfspath1","VMstore1"),

			  @("nfsserver2","/vol/nfspath2","VMstore2"),

			  @("nfsserver3","/vol/nfspath3","VMstore3")

```
			 )
```
```
 
```

$datacenter = Read-Host -Prompt "Datacenter name"

```
 
```
```
Write-Host "Datacenter is $datacenter"
```
```
 
```
```
connect-viserver -server $myvCenter
```
```
 
```
```
#
```

# Get all hosts in all clusters in the named datacenter

$ObjAllHosts = get-datacenter -name $datacenter | Get-Cluster  |  Get-VMHost

```
 
```
```
ForEach($objHost in $ObjAllHosts){
```
```
	ForEach($nfsItem in $nfsArray) {
```
```
 
```

      Write-Host "Adding datastore" $nfsItem[2] "with path" $nfsItem[0]":"$nfsItem[1] "to" $objHost

      New-Datastore -Nfs -NfsHost $nfsItem[0] -Path $nfsItem[1] -Name $nfsItem[2] -VMHost (Get-VMHost $objHost)

```
    }
```
```
}
```

disconnect-viserver -server $myvCenter -Confirm:$false