as requested by Tim Burke, added to RHEL5.2 release notes updates (online release notes) regarding fscache: <quote> Thanks to the help of upstream developers and testing customers, the FS-Cache feature has undergone significant changes in line with upstream FS-Cache implementation. Consequently, the technology preview implementation of FS-Cache in this release is now rendered obsolete. As such, Red Hat does not recommend the usage of FS-Cache. Note that FS-Cache will also be likely disabled for the next minor releases. Red Hat will be focusing on further refining this feature as per upstream specifications. Once an acceptable level of invasiveness and compatibility is reached, FS-Cache will then be re-introduced in Red Hat Enterprise Linux. </quote> please advise if any further revisions are required. thanks!
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.2/html/Release_Notes/x86/ar01s01.html