1 / 11

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. There are many digital storage technologies available

talli
Télécharger la présentation

Overview of Secondary Storage Technologies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Overview of Secondary Storage Technologies Prepared For: The Government Information Preservation Working Group December 16, 2003 Presented by: Richard Vining

  2. 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”

  3. 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?

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. Storage Technology Profiles

  11. For more information, please contact… CBICreative Businesses, Inc. Rich Harada: (201) 722-9890, RichHarada@aol.com Rich Vining: (978) 374-3799, rcvining@comcast.net

More Related