HP P3410A HP NetRAID 1M/2M Installation & Configuration - Page 25
Spanned Arrays: RAID Levels 10 and 50
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Chapter 2 RAID Overview Spanned Arrays: RAID Levels 10 and 50 With HP NetRAID-1M and 2M adapters, array spanning allows the capacity of up to eight basic arrays to be combined into a single storage space. A spanned array configuration must have the same number of disk drives in each basic array. For example, a RAID 5 array containing three drives cannot be combined with a RAID 5 array containing six drives. RAID 10: Spanning with Mirrored Arrays A RAID 10 configuration combines multiple RAID 1 arrays into a single storage space. The data is mirrored within each RAID 1 array and striped across all the RAID 1 arrays that constitute the RAID 10 logical drive. For example, if your RAID 10 configuration spans two RAID 1 arrays, data blocks are written as follows: Spanned Array (RAID 10) Array 1 (RAID 1) Array 2 (RAID 1) Stripe 1 Stripe 2 Stripe 3 Disk 1 Block 1 Block 3 Block 5 Disk 2 Block 1 Block 3 Block 5 Disk 3 Block 2 Block 4 Block 6 Disk 4 Block 2 Block 4 Block 6 RAID 10 Advantages • There is no data loss or system interruption due to disk failure, because if one disk fails, its mirror image is available. • Read performance is fast, because data is available from either disk in each pair. • RAID 10 lets you create large logical drives: ♦ With the HP NetRAID-1M adapter, the total number of disks in the RAID 10 logical drive is limited by the number of disks that can be attached to a single SCSI channel. For example, if the Rack Storage/12 enclosure is used, the maximum number of disks in a RAID 10 logical drive is 12. ♦ With the HP NetRAID-2M adapter, you can span up to eight RAID 1 arrays, resulting in a 16-disk RAID 10 logical drive. 17