Content-Aware Cache Filter for VDI Boot Storms
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Solution Overview
Problem
Virtual desktop infrastructure (VDI) deployments face resource bottlenecks during 'boot storms' due to simultaneous access to identical or similar boot images, leading to network resource stress and user delays.
Innovation Solution
Implementing a content-aware cache structure that utilizes high-speed local persistent storage devices to store frequently accessed data blocks, allowing the cache filter component to redirect I/O requests from the networked disk array to local memory, thereby reducing network access during I/O-intensive processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple virtual desktops simultaneously access identical boot images from the networked disk array during boot storms, then each virtual desktop can be booted, but network resource stress increases and user delays occur
Solution Approach 1:
The patent merges identical data blocks from multiple virtual desktop boot images into a single cached copy in the server's local persistent storage. When multiple virtual desktops need to boot simultaneously, they access the same cached data blocks rather than each accessing separate copies from the networked disk array, thereby reducing network resource stress while maintaining boot productivity.
Solution Approach 2:
The patent performs preliminary actions by pre-loading and caching frequently accessed data blocks from boot images into the server's local persistent storage before boot storms occur. This preliminary caching ensures that when boot storms happen, the data is already available locally, eliminating network access delays and reducing network resource stress during peak demand.
2Reliability
If the server accesses the networked disk array for each I/O request during boot storms, then data can be retrieved, but network access delays increase
Solution Approach 1:
The patent introduces an intermediary component (the cache filter driver) that sits between the virtual desktops and the networked disk array. This intermediary intercepts I/O requests, checks if the requested data blocks are already cached in the server's local persistent storage, and serves them from the cache if available. This eliminates the need for repeated network accesses while ensuring data retrieval reliability.
Solution Approach 2:
The patent creates copies of frequently accessed data blocks from the networked disk array and stores them in the server's local persistent storage. These local copies allow the server to fulfill I/O requests without accessing the network, thereby eliminating network access delays while maintaining data retrieval reliability through the use of identical data blocks.
3Productivity
If the cache stores data blocks for multiple virtual desktops, then network accesses are reduced, but cache management complexity increases
Solution Approach 1:
The patent implements a self-service cache management system where the cache filter driver automatically identifies identical data blocks across multiple virtual desktop boot images, deduplicates them in the server's local persistent storage, and manages cache hits and misses without manual intervention. This automated approach reduces network accesses while keeping cache management complexity manageable through self-service operations.
Data Source
AI summary
A server supporting the implementation of virtual machines includes a local memory used for caching. During I/O intensive processes, a “content aware” cache filter component of the server first accesses a cache structure in a content cache device to determine whether data blocks have been stored in the cache structure prior to requesting the data blocks from a networked disk array via a standard I/O stack of the hypervisor.