Standard Redundant Fans For Cooling; Unmatched Competitive Advantage In Raid Choices - Hitachi Lighting 9900 Series Architecture Manual

Standard Redundant Fans for Cooling

The Lightning 9900
™
components of the system. The speed and operation of these fans are monitored by the
environmental monitoring system. If a fan should fail, it can be "hot swapped" without
disruption to the cooling system.

Unmatched Competitive Advantage in RAID Choices

The flexibility in choice for Lightning 9900
unmatched. It is important to have choices in RAID protection since files and data have
different characteristics in terms of user required performance, uptime, and rebuild times.
RAID-1+ (mirroring) offers the highest performance (read from either disk in the mirror
pair) during normal operation. RAID-1+ also offers the highest performance in the event
of a failed disk since it is not necessary to read parity (and then data) in the event of a disk
failure in other RAID configurations.
The Lightning 9900 ™
system, depending on the level of availability and performance required by the data hosted
on the Lightning 9900 Series system. For example, a single Lightning 9900
™
can configure both RAID-1+ and RAID-5.
Hitachi High Availability Software Improves Application Service Levels
provides fully redundant fans for uninterrupted cooling to all
Series RAID protection for disk drives is
™
Series also offers the capability to intermix RAID levels within a
Series system
™
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