Tiered Storage is a facts storage Method or Device together with or Greater garage Media kinds, such as CDs, DVDs, tough drives, optical discs, tough disc power Arrays and Magnetic Tape Drives. The media type used to save a Class of inFormation is determined through numerous elements, inclusive of media value, statistics Availability requirements, facts recoverability, and so on.
Tiered garage and “hierarchical garage control” (HSM) are now and again referenced as intercHangeable. However, HSM normally refers to an automatic sySTEM of statistics Switch to a number of media types depending at the frequency of use. For Instance, statistics stored on Disk Drives may be transferred routinely to Magnetic Tape if not used for a duration of months.
Tiered storage may additionally contain two degrees while the to be had media kinds are handiest tough drives and tapes; every of these tiers includes variations in four essential Attributes, this is, fee, performance, capability and Function.
New era and vintage era may also Constitute the to be had media types; this would dictate stages as every could contain differences in all 4 attributes. Similarly, high performance garage devices and slower, low performance gadgets may additionally dictate stages.
Tiered garage requirements are also determined by means of useful variations, consisting of the need for Replication for protection purposes and excessive-speed recuperation of Data by difficult disk pressure arrays. In this case facts is stored for two specific features; accordingly, as a minimum two tiers could be appropriate. Two very widely used tiers, sigNiFicantly divided by get right of entry to speed, are the stages of Magnetic Disk and tapes; another commonplace two-tier device is magnetic disk and Optical Disk.
Depending on enterprise defined policy for Records garage, some providers’ products may also blur the differences between tiered storage and HSM. They offer Software to implement the coverage via robotically assigning or transferring records storage depending on changing records, frequency of use and the available storage media.
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