Virtual Tape Engine Named Mount Optimization

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Solution Overview

Problem

Enhanced File System (EFS) enabled Virtual Tape Engines (VTEs) experience significant delays in processing named mount requests due to the need to search through all file systems to locate the correct volume, leading to inefficient mount operations.

Innovation Solution

Implementing a named mount optimization system that maintains a file list containing all tape volume names from scratch and named lists, allowing VTEs to efficiently search for requested volumes within this list instead of scanning through entire file systems, and periodically updating this list through polling or immediate initialization processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If EFS VTEs search through all file systems to locate requested volumes, then volume location flexibility is improved, but mount operation speed deteriorates

Engineering Contradiction:

Improvevolume location flexibilityVSAvoidmount operation speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The system pre-generates and maintains a file list containing all volume names and their corresponding file system locations before mount operations are needed. This preliminary action allows the VTE to quickly locate requested volumes by searching the pre-generated file list rather than scanning through all file systems during actual mount operations, thus resolving the contradiction between location flexibility and mount speed

Inventive Principle:

Principle #10Preliminary action

2Speed

If a comprehensive file list of all volumes is maintained, then volume search efficiency is improved, but system memory usage increases

Engineering Contradiction:

Improvevolume search efficiencyVSAvoidsystem memory usage

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The system extracts only the essential information needed for volume location (volume names and file system paths) from the complete file system structure and stores it in a separate file list. This extraction approach maintains search efficiency by having readily available volume location data while minimizing memory usage by storing only necessary information rather than maintaining complete file system structures in memory

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the file list is updated frequently to reflect current volume states, then data accuracy is improved, but processing overhead increases

Engineering Contradiction:

Improvedata accuracyVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system implements periodic polling at configured intervals to update the file list with current volume states from scratch and named lists. This periodic update approach ensures data accuracy by regularly synchronizing the file list with actual volume locations while controlling processing overhead by updating at reasonable intervals rather than continuously or with every volume change

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS9471233B1Named mount optimization for virtual tape systems

Publication Date: 2016.10.18 DELL EMC

AI summary

Embodiments are described for named mounts in a virtual tape engine (VTE) system. A system maintains a file list of named volumes for each of the VTEs. When named mount requests are received, the system searches the file list for the named volume rather than searching through each of the file systems for each of the VTEs. When the volume name is found on a file list, the VTE for the volume name is identified and the mount request can be completed.