As an Oracle DBA, I have heard and read a lot about RAID 5 and what it can do to database write performance. Now I understand RAID 5 has been improved to the point that all of the things that caused the overhead are now being handled in disk cache, and write times are now close to that of RAID 0+1. Has anyone else heard of this? Has anyone had any experience with it? I have a client who must choose between RAID 0+1 and RAID 5. The decision will have a large bearing on available disk space. Thanks for any input.