1U Storage Blade with Nested Drive Drawers and Redundant Controllers
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Solution Overview
Problem
Current storage solutions for blade servers often require larger form factors, such as 2U, which occupy more space and do not provide enterprise-class reliability with redundant controllers, limiting flexibility and availability.
Innovation Solution
A storage blade with a 1U form factor that includes two drive drawers with 16 media drive bays and redundant controllers, allowing direct attached storage to servers, with hot-serviceable media and power/memory parameters optimized for enterprise reliability, and compatibility with various blade chassis like Cisco UCS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If storage solutions use larger form factors (2U), then more space is available for components and drives, but space efficiency and flexibility are reduced
Solution Approach 1:
The patent implements nested drive drawers within the blade housing, where multiple drive bays are arranged in compact configurations. Drive drawers can be inserted into one another or stacked vertically to maximize storage density within the constrained 1U form factor, allowing multiple drives to be housed in a minimal footprint.
Solution Approach 2:
The patent transitions from horizontal expansion to vertical stacking by arranging drive bays in multiple levels and dimensions within the blade housing. Drive drawers are positioned at different heights and depths, utilizing the third dimension (vertical space) to increase storage capacity without increasing the horizontal footprint.
2Reliability
If redundant controllers are added, then reliability and availability are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple controllers into a single integrated controller assembly that manages all drive bays. The first and second controllers are housed together and work in conjunction to provide redundant functionality, merging control functions while maintaining physical separation for fault isolation.
Solution Approach 2:
The patent changes the operational parameters of controllers by configuring them in redundant pairs where each controller can independently manage the entire array. This parameter change from single-controller to dual-controller mode enables failover capabilities while maintaining manageable complexity through standardized interfaces and configurations.
3Ease of operation
If hot-serviceable media is implemented, then maintenance flexibility is improved, but risk of data loss or system instability increases
Solution Approach 1:
The patent implements preliminary actions by pre-configuring hot-plug capable interfaces and controllers that are specifically designed to recognize and accommodate drive insertion/removal events. The system is prepared in advance with appropriate firmware, drivers, and hardware interfaces that enable seamless hot-swapping without requiring system shutdown or reconfiguration.
Solution Approach 2:
The patent provides beforehand cushioning through redundant controllers and RAID configurations that protect against data loss during hot-swapping operations. The redundant controller stands by to immediately take over if a drive is removed or fails, and RAID parity information provides a buffer that allows drive replacement without compromising data integrity or system stability.
Data Source
AI summary
A storage blade apparatus includes a blade housing, a first drive drawer, a second drive drawer, and at least first and second redundant controllers. The first drive drawer is included in the blade housing and includes a first set of drive bays. The second drive drawer is included in the blade housing and includes a second set of drive bays. The first and second redundant controllers are contained within the blade housing and each of the first and second redundant controllers is operably connected to each of the first set of drive bays and each of the second set of drive bays. The blade housing is configured to fit within a blade slot of a chassis.