如何规划数据备份.pptVIP

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如何规划数据备份.ppt

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如何规划数据备份

Hewlett Packard Company, v 1.00 Offline Data Management Chapter 2 - Introduction Define archiving Discuss some of the issues affecting data storage Define storage methods and terms Highlight the need and examples of automated storage devices Archiving The long term storage of information externally to the main computer system Reduce amount of on-line storage required, but still store historic information Paper records Space consuming, difficult to index Microfiche Expensive to create Tapes Cheap media, slow sequential access Optical media Low cost, robust media, good random access Data Storage Requirements A4 page of text (unformatted) 2Kbytes A4 B/W scanned drawing 50Kbytes A5 24-bit scanned colour image 40Mbytes ***JB*** Example Requirement will determine most applicable storage device Need to plan for future requirements Data Storage Defined Automation Automation is the process, whereby electro-mechanical systems are added to a device to enable it to operate with the minimum of human intervention” Need For Automation Individual media items do not have sufficient capacity Retrieval delayed by manual handling User interaction may lead to errors Requirement for lights out operation Need to restore from multiple backups Duplication of multiple tapes for off-site storage Automated Storage Devices Autoloaders DAT/DLT Single drive + multiple tapes Libraries DLT Multiple drive capability + multiple slots Optical jukeboxes CD/MO Multiple drive capability + multiple slots Optical towers CD/MO Multiple drives Chapter 3 - Technologies Examine the various technologies available Tape Optical Discuss media life issues Tape Technologies(Sequential Access) QIC/Travan Max 4GB capacity (native) Single drive DAT 2-12GB capacity (native) Autoloaders DLT 15-35GB capacity (native) Autoloaders Libraries Optical Technologies(Random Access) Compact Disk 650 MB CD/R CD/RW DVD 4.7 GB to 17GB Magneto-Optical 650MB to 2.6 GB Proprietary Optical Phase Change 650MB Ab