HP Smart Array P411 8-port SAS RAID Controller 572531-B21 manual Fault Tolerance, Fault Recovery

QuickSpecs

HP Smart Array P411 Controller

Standard Features

Fault Tolerance	Keeps data available and server running while a failed drive is being replaced; several fault tolerance
	configurations are supported including:
	RAID 6 with ADG (Advanced Data Guarding): This is the highest level of fault tolerance. It allocates
	two sets of parity data across drives and allows simultaneous write operations. This level of fault
	tolerance can withstand two simultaneous drive failures without downtime or data loss.
	RAID 6+0: Supported with min of 8 drives, but would have 4 available. Target benefit is to split RAID
	across the external boxes
	NOTE: RAID 6, 6+0 can be enabled with either
	Minimum of 256 MB cache with Battery kit and Smart Array Advanced Pack License key option
	upgrades
	Minimum of 512 MB BBWC or FBWC and Smart Array Advanced Pack License key option
	upgrades
	RAID 5 (Distributed Data Guarding): This allocates one set of parity data across drives and allows
	simultaneous write operations. This level of fault tolerance can withstand a single drive failure
	without downtime or data loss.
	RAID5 is available on the SA P411 with a minimum of 256MB cache
	RAID 5+0: This is a RAID 0 array striped across 5 elements. Combines the straight block-level
	striping of RAID 0 with the distributed parity of RAID 5.
	Drive Mirroring (RAID 1, 1+0): This allocates half of the drive array to data and the other half to
	mirrored data, providing two copies of every file. It is a high-performance RAID.
Fault Recovery	Minimizes downtime, reconstructs data, and facilitates a quick recovery from drive failure
	Recovery ROM: This new feature provides a unique redundancy feature that protects from a ROM
	image corruption. A new version of firmware can be flashed to the ROM while the controller
	maintains the last known working version of firmware. If the firmware becomes corrupt, the
	controller will revert back to the previous version of firmware and continue operating. This reduces
	the risk of flashing firmware to the controller.
	On-Line Spares: There is no limit to the number of spare drives that can be installed prior to drive
	failure. If a failure occurs, recovery begins with an On-Line Spare and data is reconstructed
	automatically.
	DRAM ECC corrects against single bit data and address corruption.
	Battery-backed write cache upgrade provides for up to two days of battery power for data cache
	retention. The data backup duration could be extended anytime the server's auxiliary power is
	available during system power down.
	Flash Backed Write Cache upgrade provides indefinite data retention.
Ease of Use	Consistency and Upgradeability make the Smart Array family unique in the industry:
	GUI based configuration, management and diagnostic software tools
	Common data format between generations of products
	Data migration between servers and external HP Modular Smart Array enclosures and HP Disk
	Enclosures

DA - 13202 Worldwide — Version 25 — November 1, 2013 Page 6