One of major customer has a lot of files used, for shortage i-nodes on file system. almost small size of files. and Huge number of files on single directory. So, This customer has changed to ZFS from LDISKFS. That is very good design for customer. Automatically i-nodes size increate and decrease.
The customer name is Samsung SAIT. They will use high performance archive file system. and need many billions of files on single file system. It is meaningful high density storage box for customer.