4.5

Table Of Contents
If you use QuickPrep, when you recompose the linked clone, the parent virtual machine's SID is preserved on
the
linked clone as long as you select the same parent virtual machine for the recompose operation. If you select
a different parent virtual machine for the recomposition, the new parent's SID is replicated on the clone.
If you use Sysprep, a new SID is always generated on the clone. For details, see “Recomposing Linked Clones
Customized with Sysprep,” on page 85.
Table 5-5 shows the effect of View Composer operations on linked-clone SIDs and third-party application
GUIDs.
Table 5-5. View Composer Operations, Linked-Clone SIDs, and Application GUIDs
Support for SIDs or GUIDs
Clone Creation Refresh Recompose
Sysprep: Unique SIDs for
linked clones
With Sysprep
customization, unique SIDs
are generated for linked
clones.
Unique SIDs are preserved. Unique SIDS are not
preserved.
QuickPrep: Common SIDs
for linked clones
With QuickPrep
customization, a common
SID is generated for all
clones in a pool.
Common SID is preserved. Common SID is preserved.
Third-party application
GUIDs
Each application behaves
differently.
NOTE Sysprep and
QuickPrep have the same
effect on GUID
preservation.
The GUID is preserved if an
application generates the
GUID before the initial
snapshot is taken.
The GUID is not preserved
if an application generates
the GUID after the initial
snapshot is taken.
Recompose operations do not
preserve an application
GUID unless the application
writes the GUID on the drive
specified as a View
Composer persistent disk.
Choosing QuickPrep or Sysprep to Customize Linked-Clone Desktops
QuickPrep and Microsoft Sysprep provide different approaches to customizing linked-clone desktops.
QuickPrep is designed to work efficiently with View Composer. Microsoft Sysprep offers standard
customization tools.
When you create linked-clone desktops, you must modify each virtual machine so that it can function as a
unique
computer on the network. View Manager and View Composer provide two methods for personalizing
linked-clone desktops.
Table 5-6 compares QuickPrep with customization specifications that are created with Microsoft Sysprep.
Sysprep is supported only when the pool is created in vSphere mode and on vSphere 4.1 software. You cannot
use Sysprep to customize linked-clone deskstops on vSphere 4.0 or VMware Infrastructure 3.5 software.
Table 5-6. Comparing QuickPrep and Microsoft Sysprep
QuickPrep
Customization Specification (Sysprep)
Designed to work with View Composer.
For details, see “Customizing Linked-Clone Desktops with
QuickPrep,” on page 83.
Can be created with the standard Microsoft Sysprep tools.
Uses the same local computer security identifier (SID) for all
linked clones in the pool.
Generates a unique local computer SID for each linked clone
in the pool.
Can run additional customization scripts before linked
clones are powered off and after linked clones are created,
refreshed, or recomposed.
Can run an additional script when the user first logs in.
VMware View Administrator's Guide
82 VMware, Inc.