Hello. Finally I managed to obtain good time results with my old computers with the booster volume in "unify" over "afr"... It was important for me to obtain these sort of result with old machines... Problems came later. "A" - If I make "unify" over "afr" and afterwards "striping" when I want to read a file I obtain a read error by permissions. I have checked the permissions and are ok. What could be wrong with this configuration? Please, have you seen configuration "A" working properly at your tests? "B" - If I make "unify" over "striping" and afterwards "afr", I can read the files, but the storage (because of the final striping) of the files seems not redundant, therefor not high availability... My configuration # # server1------- --- # | str1&afr0 | # server2 ---------- | # | | | Unify # server3 ------ |str2&afr1 | # | | # server4 ---------- --- Do you know how can I obtain high availability with the following prerequisites? 1) I need to read the files balanced. (2MB from one server, afterwards other 2MB from other server and so on) -> Striping 2) Writting of files have to be balanced to my "afr" volumes -> Unify over afr Thank you very much. Víctor.