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Originally Posted by aldowsary
Thanks alot guys for the responds, and special thank for kapilraj because he exactly answer my question.
So, as I understand from kapilraj answer there is no way to know the used space on a specific LV unless it is belong to a specific FileSystem, or through the Application that using this LV.
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This was the point of my first answer. It depends on what type of filesystem is mounted on the logical volume. A normal jfs or jfs2 can be analysed just using df however a sysdump device is not used for normal files and can only be analysed by the lsvg or sysdumpdev command.