HP t5700 manual Enhanced Write Filter Manager

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Enhanced Write Filter Manager

The Enhanced Write Filter Manager provides a secure environment for thin-client computing by protecting the thin client from undesired flash memory writes (the operating system and functional software components reside in flash memory). The write filter also extends the life of the thin client by preventing excessive flash write activity. It gives the appearance of read-write access to the flash by employing a cache to intercept all flash writes and returning success to the process that requested the I/O.

The intercepted flash writes that are stored in cache are available as long as the thin client remains active, but are lost when you reboot or shut down the unit. To preserve the results of writes to the registry, favorites, cookies, and so forth, you can transfer the contents of the cache to the flash on demand using the Altiris Deployment Solution software or manually using the Enhanced Write Filter Manager.

After you disable the write filter, all future writes during the current boot session are written to the flash with no further caching until reboot. You can also enable/disable the write filter using the command line. Always enable the writer filter after you have made all of your permanent changes.

The administrator should periodically check the status of the cache and reboot the thin client if the cache is more than 80 percent full.

ÄCAUTION: Never disable the write filter cache if it is more than 80 percent full.

To avoid flash corruption when administering the thin client for permanent changes, HP strongly recommends that you disable the write filter cache before making permanent modifications to the system. Remember to enable the writer filter after making all of your changes.

The following section describes how you can manipute the write filter through the command line.

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Quick Reference Guide

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Contents Quick Reference Guide Quick Reference Guide Contents Quick Reference Guide Session services IntroductionCitrix ICA Microsoft RDPTerminal emulation support Extended Windows XPe features Support service Altiris Deployment SolutionLogging on Automatic logonManual logon Pre-installed utilities Administrator logon accessEnhanced Write Filter Manager Altiris Client AgentCitrix Program Neighborhood Macromedia Flash PlayerXPe desktop Remote Desktop ConnectionUser desktop Administrator desktop Enhanced Write Filter Power management Programs menu extended selectionsSystem time Internet Explorer Control Panel extended selectionsTeemNT HP RAMDiskRegional and Language Options Administrative ToolsServices User ManagerPeripherals USB to Serial converter cableAdding printers-using generic text-only print driver PrintersUsing manufacturer print drivers AudioNetwork protection Sygate firewallOn-by-default Configuring Microsoft Windows FirewallMicrosoft Windows Firewall Quick Reference Guide Quick Reference Guide Quick Reference Guide Gathering configuration information Troubleshooting applicationsFailure symptoms ResolutionAdding a program Additional resources Microsoft Internet Explorer Windows MessengerWindows Media Player Enhanced Write Filter Manager Enhanced Write Filter Manager command line control AllCommit Commitanddisable DisableEnable Enable EWFCommit data to volume Overlay configurationClear boot command Enhanced Write Filter status toolLocal drives Drive ZDrive C and Flash Mapping network drives Saving filesRoaming profiles User log accounts Creating a new user accountUser profiles Quick Reference Guide Altiris Deployment Solution software Firmware upgradesAdd-on modules HP Compaq Thin Client Imaging Tool Index Tscal