document ESXi disk compaction & use verbose option

builder/vmware/iso/driver_esx5.go

@@ -47,7 +47,7 @@ func (d *ESX5Driver) Clone(dst, src string, linked bool) error {
 
 func (d *ESX5Driver) CompactDisk(diskPathLocal string) error {
 	diskPath := d.datastorePath(diskPathLocal)
-	return d.sh("vmkfstools", "-K", diskPath)
+	return d.sh("vmkfstools", "--punchzero", diskPath)
 }
 
 func (d *ESX5Driver) CreateDisk(diskPathLocal string, size string, adapter_type string, typeId string) error {

website/source/docs/builders/vmware-iso.html.md.erb

@@ -147,7 +147,8 @@ builder.
 
     For ESXi, this defaults to `zeroedthick`. The available options for ESXi
     are: `zeroedthick`, `eagerzeroedthick`, `thin`, `rdm:dev`, `rdmp:dev`,
-    `2gbsparse`.
+    `2gbsparse`. Due to default disk compaction processing, when using `thick`
+    set `skip_compaction` to `true`.
 
     For more information, please consult the [Virtual Disk Manager User's
     Guide](https://www.vmware.com/pdf/VirtualDiskManager.pdf) for desktop
@@ -326,10 +327,11 @@ builder.
     `5m` or five minutes.
 
 -   `skip_compaction` (boolean) - VMware-created disks are defragmented and
-    compacted at the end of the build process using `vmware-vdiskmanager`. In
-    certain rare cases, this might actually end up making the resulting disks
-    slightly larger. If you find this to be the case, you can disable compaction
-    using this configuration value. Defaults to `false`.
+    compacted at the end of the build process using `vmware-vdiskmanager` or
+    `vmkfstools` in ESXi. In certain rare cases, this might actually end up
+    making the resulting disks slightly larger. If you find this to be the case,
+    you can disable compaction using this configuration value. Defaults to
+    `false`.
 
 -   `skip_export` (boolean) - Defaults to `false`. When enabled, Packer will
     not export the VM. Useful if the build output is not the resultant