Hybrid Linux Boot Sequence for Embedded Resilience
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Solution Overview
Problem
Embedded systems face challenges in booting reliably due to the reliance on network boot, which fails if the remote server is offline, and disk boot, which is slow and requires physical access for repairs in case of failures.
Innovation Solution
A hybrid boot sequence that combines RAM boot for the kernel and root filesystem, disk boot for system services and software applications, and network boot in case of local disk failure, ensuring enhanced resiliency against independent failures of boot media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network boot is used, then resiliency against local disk failures is improved, but dependency on remote server availability worsens
Solution Approach 1:
The system performs preliminary actions by downloading and storing backup kernel images and root filesystems from remote servers to local disk storage before failures occur. This allows the embedded device to have local copies ready for immediate booting if network boot fails, reducing dependency on continuous remote server availability while maintaining resiliency.
Solution Approach 2:
The patent introduces local disk storage as an intermediary between network boot and RAM boot mechanisms. The local disk serves as a backup storage medium that holds kernel images and filesystems, acting as a mediator that can supply boot files when network access is unavailable, thus reducing dependency on remote servers while maintaining boot resiliency.
2Speed
If disk boot is used, then local boot speed is improved, but physical access for repairs is required in case of failures
Solution Approach 1:
The patent introduces network boot as an intermediary repair mechanism that allows remote access to kernel images and filesystems stored on remote servers. When local disk boot fails, the system can fall back to network boot, enabling technicians to repair the system remotely without requiring physical access to the embedded device, thus maintaining fast local boot performance while improving ease of repair.
3Speed
If RAM boot is used, then boot speed is improved, but system RAM is reserved at the expense of applications
Solution Approach 1:
The patent segments the boot process into distinct phases: initial boot from local disk or network, then selective loading of only essential kernel components into RAM. This segmentation allows the system to achieve fast boot speeds by loading only critical elements into RAM while leaving the majority of the filesystem on local storage, thus improving boot speed without significantly reducing available RAM for applications.
4Quantity of substance
If local disk is included, then capacity and cost-effectiveness are improved, but vulnerability to disk failures worsens
Solution Approach 1:
The patent applies local quality by implementing different storage strategies for different types of data: critical boot files (kernel images, initrd) are stored on local disk for fast access, while backup copies and less frequently accessed filesystems are stored on remote servers. This differentiated approach allows the system to take advantage of local disk capacity and speed while mitigating vulnerability to disk failures through remote redundancy.
Data Source
AI summary
Disclosed herein are network elements for use in a transport network and methods of using the same. The network elements may comprise an embedded device having a processor, a communication device in communication with the processor, a first memory, a second memory, and a third memory. The third memory may store a hybrid boot sequence comprising computer-executable instructions that when executed by the processor of the embedded device cause the embedded device to: determine whether a first kernel image is stored on the first memory; responsive to the determination that the first kernel image is not stored on the first memory, obtain a second kernel image stored on a remote network element; store at least one of the first kernel image and the second kernel image on the second memory as a primary kernel image; and boot the primary kernel image stored on the second memory.