When deactivating caching on an OSS through the osd proc files: read_cache_enable and writethrough_cache_enable, it only simulates Lustre's behaviour without cache.

It would be interesting though, for Lustre's OSSes to be able to allocate their memory outside of the pagecache for it seems to be a performance issues when using SSD disks: it creates a CPU overload and 65% of CPU ressources are spent to allocate/free memory from the pagecache.