Umbrella File System : Storage Management Across ... · Umbrella File System : Storage Management Across Heterogeneous Devices (TOS09’) JOHN A. GARRISON and A.L. NARASIMHA REDDY

Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage Umbrella File System : Storage

Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous Management Across Heterogeneous

Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)Devices (TOS09’)

JOHN A. GARRISON and A.L. NARASIMHA REDDY

Mobile Embedded Lab. School of Computer Science University of SeoulMobile Embedded Lab. School of Computer Science University of Seoul

2010/02/02

Yongseok Oh

[email protected]

1

JOHN A. GARRISON and A.L. NARASIMHA REDDY

Texas A&M University

� Introduction

� Our approach

� Implementation

� Evaluation results

ContentsContentsContentsContentsContentsContentsContentsContents


� Evaluation results

� Example UmbrellaFS scenarios

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� Storage systems in the future will likely incorporate both

flash-memory based devices and magnetic disks

� Various methods have been proposed to compensate for

and exploit this diversity in device characteristics

■ AUTORAID

IntroductionIntroductionIntroductionIntroductionIntroductionIntroductionIntroductionIntroduction


■ AUTORAID

■ SSDs for a cache to improve the performance

� Current file system map files to devices based on the

namespace organizations

� UmbrellaFS uses three different types of storage, HDD,

SSD, and HDD with H/W encryption support

■ Rule based

3

� Hourglass Model

Our approachOur approachOur approachOur approachOur approachOur approachOur approachOur approach

Mobile Embedded Lab. School of Computer Science University of SeoulMobile Embedded Lab. School of Computer Science University of Seoul 4

� UmbrellaFS

Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)


as a single file system

Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)Our approach(cont’d)


soft link

� UmbrellaFS functions as a stackable file system,

residing below VFS and above the underlying file

systems

� The policy module

System designSystem designSystem designSystem designSystem designSystem designSystem designSystem design


The policy module

■ For example

� Any file larger than 100KB should be directed to a file system on a

RAID5

� Dave’s files should be stored on a seconds storage

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� Dave wants to map most of his personal files to the

encrypted storage, read only files to the flash

storage, and his video files and all other files to the

magnetic storage

ExampleExampleExampleExampleExampleExampleExampleExample


� Periodic policy enforcer to run during off-peak usage

times

System design(cont’d)System design(cont’d)System design(cont’d)System design(cont’d)System design(cont’d)System design(cont’d)System design(cont’d)System design(cont’d)


� UmbrellaFS

■ linux kernel 2.4 and 2.6

■ based on Unionfs

■ the rule evaluation framework

ImplementationImplementationImplementationImplementationImplementationImplementationImplementationImplementation


� eCryptFS

� UnionFS

� RAIF

Stackable file systemStackable file systemStackable file systemStackable file systemStackable file systemStackable file systemStackable file systemStackable file system


� Dell Optiplex GX620

■ Intel 3.2GHz

■ 2GB RAM

■ Linux 2.6.9

Evaluation resultsEvaluation resultsEvaluation resultsEvaluation resultsEvaluation resultsEvaluation resultsEvaluation resultsEvaluation results


■ Samsung 7200rpm 250GB SATA

■ Seagate Cheeta 10k 773GB SCSI

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� bonnie++

■ read/write two 1GB files

� Compiling OpenSSH

■ Cpu intensive benchmark

Benchmark toolsBenchmark toolsBenchmark toolsBenchmark toolsBenchmark toolsBenchmark toolsBenchmark toolsBenchmark tools


� Postmark

■ 12,500 fiiles between 8kB and 64kB

■ 25,000 transactions

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bonnie++bonnie++bonnie++bonnie++bonnie++bonnie++bonnie++bonnie++


OpenSSHOpenSSHOpenSSHOpenSSHOpenSSHOpenSSHOpenSSHOpenSSH


PostmarkPostmarkPostmarkPostmarkPostmarkPostmarkPostmarkPostmark


Example Example Example Example Example Example Example Example UmbrellaFSUmbrellaFSUmbrellaFSUmbrellaFSUmbrellaFSUmbrellaFSUmbrellaFSUmbrellaFS

ScenariosScenariosScenariosScenariosScenariosScenariosScenariosScenarios

-Samsung 32GB SSD

-RAID 5 of the Seagate Cheetah


Postmark

8kB~1MB

two groups

1. read-only

2. read-write


set 1. read-only 1kB~5kB 50,000 files

set 2. read-write 8kB~1MB


� UmbrellaFS can manage storage across diverse

devices efficiently, providing performance

improvements of up to 44% in a system with both

flash based storage and RAID

ConclusionsConclusionsConclusionsConclusionsConclusionsConclusionsConclusionsConclusions


Documents

Umbrella File System : Storage Management Across ... · Umbrella File System : Storage Management Across Heterogeneous Devices (TOS09’) JOHN A. GARRISON and A.L. NARASIMHA REDDY