Trends and directions of mass storage in the scientific computing arena cas 2001
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Trends and Directions of Mass Storage in the Scientific Computing Arena CAS 2001. Gene Harano National Center for Atmospheric Research. Vision. How do we accomplish that vision? Handling large datasets – Analysis and Visualization Shared File Systems and Cache Pools Middleware and layering

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Trends and Directions of Mass Storage in the Scientific Computing Arena CAS 2001

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Trends and directions of mass storage in the scientific computing arena cas 2001

Trends and Directions of Mass Storage in the Scientific Computing ArenaCAS 2001

Gene Harano

National Center for Atmospheric Research


Vision

Vision

  • How do we accomplish that vision?

    • Handling large datasets – Analysis and Visualization

    • Shared File Systems and Cache Pools

    • Middleware and layering

    • Management tools

    • Emerging Technologies

    • (To name a few)


Large datasets

Large Datasets

  • The NCAR MSS was originally a tape based archive.

  • NCAR MSS average file size is 35 MBs (11 M files); small due to historical restrictions (single volume datasets, model history files) and a large number (25%) of files < 1 MB (user backups)

  • Single TB sized files are common for visualization and analysis

    • Currently these large files are sliced up prior to landing in the archive.

    • Access is generally sequential, but some random access.


Large datasets1

Large Datasets

  • Are tape based archives obsolete?

    • No, but there is a need to reevaluate the entire storage structure at NCAR.

      • Cache pools

      • Data warehouses, data sub-setting

    • The NCAR MSS is being treated as a shared file system rather than an archive.


Shared file system

Shared File System

Web/

GRID/

servers

  • Heterogeneous

  • High-Performance

  • High-Capacity

  • Doesn’t yet exist.

Programmatic

Shared Data

Command

Line


Cache pools

Cache Pools

  • External to the archive

    • Minimize archive activity

    • Temporary data stays out of the archive

    • Customized for a smaller set of associated data

  • Internal to the archive

    • Minimize tape activity

    • Improve response time

    • Federate and distribute

    • Repackage small files for tape storage under system control


Terascale modeling analysis

Terascale Modeling & Analysis

Advanced Research Computing System (IBM SP)

MSS

Proxy

Data analysis

GPFS

Shared File System


Terascale analysis visualization

Terascale Analysis & Visualization

Vislab

MSS Proxy

Data analysis

Storage Area Network

Shared File System


Data provisioning access

Data Provisioning & Access

MSS

Proxy

Data

Processor

Unidata,

DODs

DSS server

CDP/ESG

Storage Area Network

Shared File System


Internal cache pools

Internal Cache Pools

  • NCAR MSS event log modeling (April 2000 – April 2001) – looking at tape activity

  • 20 TB cache pool – can be federated and distributed

    • 30 day average cache residency

    • 70% reduction in tape read-backs

    • Greatly enhanced response time

    • Reduce the amount of tape resources or redefine their use.


Middleware and layering

Middleware and Layering

Role of an archive

  • An Archive performs 2 basic functions

    • Reliably storing data

    • Returning data on demand

  • Data analysis, data mining, data assimilation, distributed data servers, etc. are functions utilizing middleware that sits on top of an archive and should be implemented independent of the underlying archive.


Middleware and layering1

Middleware and Layering

  • Separate archive functionality from

    • Visualization

    • Data servers

    • Data warehousing, data mining, data subsetting

    • Web and Grid access

    • Etc.

  • Maximally enables the use of COTS

  • Allows (transparent) replacement of components as needed

  • Fill the gaps with custom software


Trends and directions of mass storage in the scientific computing arena cas 2001

Future Data Services

NCAR MSS Archive

WEB

Visualization

Data Analysis/Mining/Assimilation

Digital Libraries, Data Servers

Data Cataloging/

Searching

Data Storage

Data Storage

File Cache

Services Pools


Management tools

Management Tools

  • There is a need for better user and system management tools as MSS capacity scales.

  • How does a single user manage 1 million files?

  • How does a MSS administrator dynamically tune a system, predict workloads, find and correct bottlenecks?


Management tools1

Management Tools

NCAR MSS tools

  • Defining new roles

    • Single ordinary user

    • MSS superuser

    • As users come and go, there is a need for:

      • Project superuser (new)

      • Division data administrator (new)

  • Web based metadata user tools

    • List, search, catalog holdings – metadata mining

    • Remove unwanted files


Management tools2

Management Tools

NCAR MSS tools

  • From the system perspective – utilize data warehousing and data mining techniques

    • System modeling using event logs.

      • Capacity planning

      • Identify bottlenecks

    • Operational monitoring

      • Track errors, identify trends (media problems)

      • Intrusion detection

      • Dynamic system tuning


Emerging technologies

Emerging Technologies

  • Data Path

  • Tape

  • Holographic Storage

  • Probe-Based MEMS

  • High-Density Rosetta (analog)


Data path

Data Path

  • HIPPI in use today in the NCAR archive

  • Fibre Channel will replace our HIPPI in the near term

    • FC SAN for RAID Cache Pools

    • FC SAN for Tape sharing

  • Others

    • iSCSI

    • FC over IP

    • Infiniband


Trends and directions of mass storage in the scientific computing arena cas 2001

Tape

1 TB,60MB,2004

2H02

200GB 1Q02

500GB 2003

Opt

2003

1 TB

9840B

DTF

3590E

SD-3

Mammoth 2

3570C

3590

Ultrium

2001

9940

9840

AIT-2

Accelis

SDLT

9490 EE

Mammoth

DLT-7000

3490 E

AIT

3570

DLT-4000

3480/90

Native Cartridge Capacity (GB)

Linear

Helical


Trends and directions of mass storage in the scientific computing arena cas 2001

Tape

  • To be competitive with magnetic disk, magnetic tape must grow at 10x each 5 years.

  • Achieved by a combination of increased areal density and longer (and possibly wider) tape.

    (from a storage vendor)


Trends and directions of mass storage in the scientific computing arena cas 2001

Tape

  • RAIT (Redundant Array of Independent Tapes)

    • Increased Performance

    • Higher Reliability with the use of parity

    • Higher single “volume” Capacity

    • Large datasets on a single “volume”

  • RAIL (Redundant Array of Independent Libraries)

    • Greater total system capacity

    • Improved response time

  • These are resource intensive solutions – dedicated libraries and drives


Holographic

Holographic

  • Large capacity – 10 GBs in a single cubic centimeter (10 Gbits/in2 for magnetic disk)

  • High-speed – 2 Gigabits/sec

  • Low power

  • Billions of write cycles


Probe based mems

Probe-Based MEMS

  • MEMS – Micro-Electrical Mechanical Systems

  • Probe-based storage arrays

    • Dense

    • Highly parallel to achieve high bandwidth

    • Rectilinear 2D positioning

    • Commercial devices in the next several years


Hd rosetta

HD Rosetta

  • Product marketed by Norsam Technologies

  • Developed at Los Alamos National Lab

  • Analog

    • Lifetime of 1000s of years

    • Can be read back with only a microscope

    • Stores text and images


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