Adaptec 3210S User Guide - Page 128
RAID 5 Set, if one drive fails.
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Adaptec Storage Manager Pro User's Guide RAID 5 Set The RAID 5 set is similar to a stripe set, except that it uses parity to provide redundancy. A RAID 5 set must be made up of at least three equal-sized partitions on different drives, and the data is striped evenly across its respective drives in equal-sized chunks. You must have at least three partitions to permit the system to rebuild the data if one drive fails. As data is striped across the partitions, one chunk of each stripe is used for parity data. The parity chunks are distributed across all participating drives of the RAID 5 set, so parity operations are evenly divided among all the partitions in the array. Figure A-6 represents a RAID 5 set made up of four partitions, each on different drives. The free space of the larger drive is not used. RAID 5 Set A 12 GB Chunks 1,2,3,4,5,6,7,8, 9,10,11,12,13,14,15... Drive 1 Partition A1 4 GB Chunks 1,P*,7,10,13... *P = Parity Drive 2 Drive 3 Partition A2 4 GB Chunks 2,4,P*,11,14... Partition A3 4 GB Chunks 3,5,8,P*,15... Drive 4 Free Space Partition A4 4 GB Chunks P*,6,9,12,P*... Figure A-6. RAID 5 set A-10