Refreshing and Recreating the Local Host Cache

Refreshing LHC

You can adjust the interval by which member servers query the farm's data store for missed changes. The default interval is 30 minutes. In most cases, this default setting is sufficient.

You can force a manual refresh of a server’s local host cache by executing dsmaint refreshlhc from a command prompt. This action forces the local host cache to read all changes immediately from the farm’s data store. Refreshing the local host cache is useful, for example, if the Citrix IMA Service is running, but published applications do not appear correctly when users browse for application sets.

Recreating LHC

A discrepancy in the local host cache occurs only if the IMA Service on a server misses a change event and is not synchronized correctly with the data store.

You can manually create the local host cache from the farm’s data store. If the Citrix IMA Service fails to start or you have a corrupt local host cache, you may need to recreate it.

To recreate the local host cache, stop the IMA Service and then run the command dsmaint recreatelhc. Running this command performs three actions:

• Sets the value of the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\IMA\ RUNTIME\PSRequired to 1. This key is HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\IMA\ RUNTIME\PSRequired to 1 on XenApp, 32-bit Edition.
• Deletes the existing local host cache (Imalhc.mdb)
• Creates an empty local host cache (Imalhc.mdb)

You must restart the IMA Service after running dsmaint recreatelhc. When the IMA Service starts, the local host cache is populated with fresh data from the data store.

The data store server must be available for dsmaint recreatelhc to work. If the data store is not available, the Citrix IMA Service fails to start.