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Virtual directoriesVolume groupsIf you have a disk side mounted as \SALES\2001 and the amount of sales data torecord for that year is larger than expected, you can simply format another disk side,give it the label \SALES\2001 and the space on that disk will be made available onthat directory. This is called a volume group.For example, if 4GB of data have been written to one side of 9.1GB MO disk (4.5GBper disk side), a directory listing of \library\SALES\2001 (assuming that the diskside is labelled as \SALES\2001) will report only about 500MB free. You may nowrescan the other side of the disk (also as \SALES\2001) and approximately 4.5GB offree space will be made available to the directory, so a directory listing now reportsapproximately 5GB of free space. Obviously, if this limit is exceeded, another disk sidecan be added, and so on.There is a limitation to this: the largest file size that can be written to a volume groupis the size of the largest amount of free space on any one disk, not the total amountof free space on all disks (so even if several new disks have just been added, a filelarger than the free space on an empty disk side can never be written to a volumegroup). Directories, however, can span media surfaces.Diamond Administrator’s Guide 137