Maintaining the FSC whole file cache

You can configure either traditional FSC storage or an NFS style storage for FSC whole files known as whole file cache (WFC). (FSC/JT segments are still stored in FSC segment cache.) Whole file cache stores a copy of the file on the disk. To maintain the whole file cache: To configure whole file cache, set the whole file cache parameters in the FSC_HOME\fschostname_user.xml file and the fcc.xml files. To monitor whole file cache, use the fscadmin utility with the whole options (for example, cachesummary/whole, cachedetail/whole, clearcache/whole, and purgecache/whole). To purge files from the whole file cache, run the FSCWholeFileCacheUtil utility stored in the FSC_HOME\bin directory. Purge the cache based on file age, subdirectory size, and/or available disk space. This utility also purges misplaced files. The benefits of whole file cache for IT data storage deployments are: You can use NFS or other network storage for the FSC whole file cache. The files are whole files on a disk and not in a virtual memory mapped disk space. You no longer need a local disk or a special card to make the network disk appear local to the operating system. You can use platforms such as HP for large FSC whole file caches. Platforms that previously had issues with the segment cache or virtual memory mapping can be used with large FSC whole file caches by using the NFS style whole file disk storage (although JT segments that are not whole file are still stored in the segment cache). Whole JT files can be prepopulated to avoid segment caching. You can use redundant disk storage (or RAID) rather than dual FSC caches. You can still run two FSCs for high availability off of the network storage. Though multiple file system caches can share the same whole file cache, no more than one FSC should be responsible for purging the shared cache. When managing a shared whole file cache, purge the shared cache using either of the following methods: Disable purging on all but one of the FSCs. (This is the typical deployment.) Disable purging on all FSCs and configure a purge job to run as an external cron job (Linux) or Scheduled Task (Windows). FSC whole file cache reliability is increased to OS level file reliability. Loss of a directory entry now results in single file loss, improving the durability and reliability of the whole file cache. You can do a disk copy to transfer an FSC cache, or copy the FSC whole file cache to a DVD and mail it. A background garbage collection process runs to prune the whole file cache. The cycle on this may be several hours for very large FSC whole file caches.