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 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
(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
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
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
Standard Features
DA - 12400 Worldwide QuickSpecs — Version 5 — 10/3/2006
Page 4
