Only select Smart Array controllers offer HP's exclusive Advanced Data Guarding (RAID ADG). The Smart Array 6400 and 5304 ship with full support for RAID ADG. RAID ADG is available as an upgrade option for the Smart Array 5302. This Advanced RAID level offers dramatically higher fault tolerance than RAID 5 with lower implementation costs than RAID 1+0.
Advanced Data Guarding technology (RAID ADG) provides the highest level of data protection amount RAID levels, while still delivering a high level of disk capacity utilization. Using patented HP technology, you can safely, deploy large-capacity disk drives and create large storage volumes. RAID ADG also offers lower implementation costs and greater usable capacity per U than RAID 1.
Key Benefits
RAID ADG can tolerate multiple simultaneous drive failures without downtime or data loss
Can safely protect an array up to 56 total drives
Ideal for applications requiring large logical drives
Greater fault tolerance than RAID 1+0 or RAID 5
Lower implementation cost than RAID 1+0
Supports Online Spare Drive
Supports Online RAID Level Migration from RAID 1+0 and RAID 5
Ideal environment
RAID ADG is ideal for applications requiring large logical volumes, because it can safely protect a single volume of 56 disk drives.
Higher fault tolerance
Higher capacity utilization
Withstands two simultaneous drive failures without downtime or data loss
Model comparison
Model
Purpose
Limitation
RAID 1+0
Mirroring: Identical data stored on multiple drives, high fault tolerance, and improved performance.
Requires 50% of capacity to be dedicated to fault protection. Expensive to implement across large volumes (doubling the cost-per-capacity).
RAID 5
Distributed Data Guarding: Parity data is distributed across all drives. Protects against the failure of any one drive an a array. Provides improved performance at a minimum cost.
Lower fault tolerance. Not recommended for volumes greater than 14 drives. Too risky for large volumes.
RAID ADG
Advanced Data Guarding: Two sets of parity data distributed across all drives. Protects against the failure of any two drives in an array. Provides high fault tolerance at a minimum implementation cost.
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