Disk oder Tape — worauf speichert man heute Archivdaten?
Auch 2011 scheint immer noch zu gelten (siehe Argumente in Disk vs Tape):- Tape is always much less expensive than disk and always uses much less energy, when measured on a per petabyte basis.
- However, if the time required to retrieve any of your vast, long-term archived data needs to be a few seconds or less, then archiving to disk may be best, but will be much more costly.
- The best solution is really a blend of disk and tape, but — for most uses — we believe that the vast majority of archived data should reside on tape.
- Man könnte hinzufügen: Nur Google's Filesystem,welches eine Kopie des gesamten Internets ausfallsicher auf Commodity Disks hält, scheint ein Ausnahmefall zu sein.
Quelle: Brillig Consulting, 2008
Interessante Fakten sind auch:
- Migration to a new generation of disk systems typically becomes necessary every 3 to 5 years.
- Tape technology has a longer cycle of about 7 years.
- Tape, if handled correctly, can last 15 or more years. In general, tape offers between 4 and 6 times the life expectancy of disk (with media manufacturers specifying up to 30 years for LTO tape).
- The shelf life of disk is significantly shorter: Idle disks may start to lose data and start to demagnetize after 1 or 2 years already unless they are spun-up every 30 days.
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