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

Hitachi lightening system architecture guide

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Standard Redundant Fans for Cooling

The Lightning 9900

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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.

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

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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

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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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