What is the difference between RAID 0+1 and 1+0?
• Diagram A (RAID 0+1) [ v] || [ p] || [sv] || =======================[v2]======================= | | ==========[p2]========== ==========[p2]========== | | | | =[s2]==[s2]==[s2]==[s2]= =[s2]==[s2]==[s2]==[s2]= Striping occurs at the subvolume(p2) layer. Mirroring occurs at the subplex (v2) layer. Diagram B (RAID 1+0) [ v] || [ p] || ==========================[sv]========================== | | ===========[v2]=========== ===========[v2]=========== | | | | ====[p2]==== ====[p2]==== ====[p2]==== ====[p2]==== | | | | | | | | =[s2]==[s2]= =[s2]==[s2]= =[s2]==[s2]= =[s2]==[s2]= Striping occurs at the subvolume(sv) layer. Mirroring occurs at the subplex (p2) layer. The diagrams above use the Veritas 3.x nomenclature. Volume Resynchronization There is an additional layer of abstraction in RAID 1+0 that allows for isolation of the subdisks into subplexes. Since the subplexes are smaller than the plexes in RAID 0+1, time to resynchronize is reduced. Fault Tolerance There is an additional layer of
