Overview of Secondary Storage Technologies
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Overview of Secondary Storage Technologies. Prepared For: The Government Information Preservation Working Group December 16, 2003. Presented by: Richard Vining. The Basics. There are many digital storage technologies available

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Overview of secondary storage technologies

Overview of Secondary Storage Technologies

Prepared For:

The Government Information

Preservation Working Group

December 16, 2003

Presented by: Richard Vining


The basics

The Basics

  • There are many digital storage technologies available

  • Removable media (optical disks and magnetic tapes) will outlast the hardware and software used to create them

  • No single technology is “right” for every situation

  • It may be necessary to deploy a combination of technologies

  • There is no technology (today) that will store digital information “forever”


The questions

The Questions

  • What do you need to store (file types)?

  • How much do you need to store (capacity)?

  • How big is the biggest file (media size)?

  • How much data are you adding (performance)?

  • How long do you need to keep it (retention)?

  • How fast do you want to retrieve it (access)?

  • Does the data need to be overwrite-protected?


Types of recordable secondary media

Types of Recordable Secondary Media

120mm Optical Disc Formats:

  • CD-R / -RW:single-sided 650MB ($1.25/GB)

  • DVD-R / -RW:single-sided 4.7GB ($0.42/GB)

  • DVD+R / +RW:single-sided 4.7GB ($0.42/GB)

  • DVD-RAM:dual-sided 9.4GB ($1.75/GB)

    • Write-Once and rewritable available for all formats

    • Lower-cost, entry-level, highly-standardized, but …

    • Compatibility between formats is ‘complicated’

    • Only DVD-RAM is cartridge-based


Types of recordable secondary media1

Types of Recordable Secondary Media

5.25” Optical Disk (replacements for 9.1GB MO)

  • UDO (Plasmon): 30GB, 4MB/sec, 5s File Access, $2/GB

    • To be supported by IBM & HP?

    • MO form-factor (able to mix MO & UDO in the same library)

  • PDD (Sony): 23GB, 9MB/sec, 8s File Access, $1.95/GB

    • To be supported by DISC?

    • Thinner cartridge (more slots per library)

    • Adapted from consumer-grade “Blu-Ray” technology

    • WORM and re-writable media available

    • Dual-sided media (only half is available on-line at one time)

    • Not compatible with either MO or each other


Types of recordable secondary media2

Types of Recordable Secondary Media

12” Optical:

  • Plasmon LD-8000, dual-headed 30GB, 8MB/sec, WORM only, $15/GB

    • End-of-life? Only legacy customers continue to purchase

    • Plasmon acquired LMS drives and Cygnet Jukes

    • Rugged cartridge provides long-term protection

    • Used in high-end document management systems

    • Costs and lack of standards badly hurt this technology


Types of recordable secondary media3

Types of Recordable Secondary Media

Half-Inch Tape:

  • 9840-C: 40GB, 40MB/sec, 12s File Access, $2.50/GB

    • StorageTek & Imation are the prime suppliers

  • LTO-2:200GB, 15MB/sec, 65s File Access, $0.42/GB

    • IBM, HP & Seagate make the drives, various media suppliers

  • SDLT 600:300GB, 34MB/sec, 80s File Access, $0.40/GB

    • Quantum makes the drives, various media suppliers

  • S-AIT:500GB, 30MB/sec, 70s File Access, $0.45/GB

    • Sony proprietary, uses AIT AME & helical scan technology

  • WORM available on 9840 (VolSafeTM) and S-AIT


Types of recordable secondary media4

WORM

REMOTE

Types of Recordable Secondary Media

8-mm Tape:

  • AIT-3: 100GB, 12MB/sec, 27s File Access, $0.55/GB

    • Sony proprietary

    • WORM media available

    • Good mix of price/capacity/performance


Types of recordable secondary media5

Types of Recordable Secondary Media

Content-Addressable Storage (CAS):

  • Hard Disk based systems, with software layer for storing only unique files or blocks, based on content

  • Eliminates duplicate data, reducing capacity requirements by up to 95% (according to the vendors)

  • EMC Centera: scales from 4TB to over 1PB; redundant architecture includes mirroring and RAID-5; starts at $50/GB

  • Permabit Permeon: Linux-based software solution that works with standard hardware; cost depends on hardware used

  • “Compliance Editions” and other vendors (NetApp) available


Storage technology profiles

Storage Technology Profiles


Overview of secondary storage technologies

For more information, please contact…

CBICreative Businesses, Inc.

Rich Harada: (201) 722-9890, [email protected]

Rich Vining: (978) 374-3799, [email protected]


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