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In general you can understand like below.
All the operating systems is having volume management tools included inside it with some limitations like online relaying of volume was an issue and having less simplicity in administration.As buisness needs changed alongwith time Veritas has developed his own volume management tools which can overcome with all the limitations faced with OS based volume management and gets popular due to it,s interoperazbility with most of the server operating systems and ease of flexible administration of volumes.
