A Disk Group is a physical storage location for copies of files added to OnBase. Disk Groups are configured to allow OnBase to track, categorize, and perform specialized maintenance functions. The size and location of the Disk Group's volumes are specified when the Disk Group is configured, along with the number of copies the Disk Group contains.
Disk Groups and volumes are logical storage bins while platters are physical storage bins. Each physical copy of a volume is referred to as a platter.
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A volume is the logical division for all of the copies of a Disk Group. Volumes consolidate data into discrete units. Using multiple volumes allows you to create blocks of data that can be easily tracked as well as moved near-line, off-line, and back.
You should set your volume size to the size of the smallest media that will be used to store this volume. In many cases a volume will eventually be backed up to a Compact Disc, which safely holds 500 MB. When set up in this way, volumes ensure that a complete set of document files can fit onto each storage media used by the Disk Group.
The process of creating a new volume is called promoting the volume. Volumes are promoted automatically by the system when the amount of data in the volume reaches the configured size of the volume, or manually using Platter Management. After a volume is promoted, the previous volume is closed and no additional files are stored in it (new files are written to the new volume that was created during promotion). Documents can be accessed from any online volume.
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A platter(or copy) is the physical storage location of the files in a single copy, which can be anywhere on the network. Platters can be created on different types of media, such as mass storage, CD, tape, or optical.
This figure illustrates Disk Group 101, which has three copies (platters) and has been promoted twice, creating three volumes. New documents are written to volume 3, until volume 3 is promoted to volume 4: