Lenovo Secure Managed Client Bedienungsanleitung PDF herunterladen (Seite 44)

the base image on the hard drive and requires that they be read from the user’s

copy on the storage array, thus reducing the benefits of local cache.

Running an active defragmentation program is undesirable in the Secure Managed

Client environment. Since the logical disk is spread across multiple physical disks,

it becomes meaningless to run defragmentation because there is no linear sector to

sector correlation between the logical disk and the physical disk. Defragmentation

might also cause additional latency for the users because after it runs, contiguous

blocks of data are even more scattered across the physical disks.

For this reason, you should not run defragmentation in the Secure Managed Client

environment.

Updates

Test system updates on a few machines to ensure compatibility. Consideration

must be given to individual hotfixes and updates and how they affect the Secure

Managed Client environment. Testing should include operating system,

application, and network compatibility. Larger updates, including service packs,

drivers, and applications, can cause poor performance in the Secure Managed

Client environment if performed during regular business hours. Schedule hotfixes

and updates during non-business hours when possible.

Image protection

Environments that do not have locked images must consider an active backup

program. Windows XP and Windows Vista both contain the Volume Shadow Copy

(volsnaps) service. By default, this service runs constantly (Microsoft Vista Home

Basic and Home Premium are not supported), which allows for continuous data

protection. If possible, disable this service and create weekly backups that run

during non-business hours using the Volume Shadow Service (VSS) or a

third-party tool. VSS is sensitive to registry changes, and regular backups can

cause large amounts of data to be written to the hard disk drive if applications on

the client images are constantly changing the registry. This can cause poor

performance in the Secure Managed Client environment resulting from network

and storage array I/O saturation.

Application compatibility testing

Conduct proper testing to determine application compatibility with the entire

operating system. Microsoft has provided the Windows Performance Tool kit

http://www.microsoft.com/whdc/system/sysperf/perftools.mspx

that works with Windows Vista, Server 2008, and future operating systems.

Note: Microsoft XP tools are not supported.

Collecting Windows performance traces (WPT)

The WPT can monitor 5 settings:

v boot

v shutdown

v hibernate

v standby

v real time

To collect a trace, use the following syntax:

xbootmgr –trace <???> –numRuns <X> –resultPath <(output)> –traceFlags base

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