The dsverify tool is available (as far as I know) only from Citrix Technical support. You must be careful using this command, the version of this tool is also important. You should really only use this tool under the guidance of Citrix tech support.

The dsverify tool will find and repair problems in the MetaFrame datastore, such as a server that has been removed from the Farm, but the name still shows up in the QFARM server list.

DSVERIFY [ SERVERS | APPS | PRINTERS | GROUPS | MSLICENSE | FOLDERS ]

The command line to repair a dead server from the datastore is

dsverify servers /clean

An undocumented command line to repair load evaluators, the /LEUsers is version specific and works with version 0.4, but not with 0.7

dsverify servers /LEUsers /clean