HP Smart Array P400 User Manual

Fault Tolerance
Fault ToleranceFault Tolerance
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
RAID 6 with ADG RAID 6 with ADG
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 5
RAID 5 RAID 5
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.
RAID 1, 1+0
RAID 1, 1+0RAID 1, 1+0
RAID 1, 1+0 (Drive Mirroring): 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
Fault RecoveryFault Recovery
Fault Recovery Minimizes downtime, reconstructs data, and facilitates a quick recovery from drive failure
Recovery ROM: This feature protects the user from a firmware image corruption by storing a
redundant copy of the firmware image. If the active firmware image becomes corrupt, the
controller will use the redundant firmware image and continue operating.
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 detects and corrects data bit errors.
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.
Ease of Use
Ease of UseEase of Use
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 StorageWorks Modular Smart Array enclosures
QuickSpecs
HP Smart Array P400 Controller
HP Smart Array P400 ControllerHP Smart Array P400 Controller
HP Smart Array P400 Controller
Standard Features
DA - 12400 Worldwide — Version 9 — March 26, 2007 Page 5

HP Smart Array P400 Specifications

General

Brand	HP
Model	Smart Array P400
Category	Computer Hardware
Language	English