This is a modified version of RAID-5. RAID-S is different from RAID-5 in that it stripes the parity, not the data, and it implements a write-cache to remove the RAID-5 write penalty. To implement data striping, third-party software needs to be implemented. Without this extra software, you may experience bottlenecks when data is being written. The write-cache improves performance by deferring writes and performing parity calculations at a time when the system is less busy.