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IBM System Storage N series Software Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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qtrees
This chapter describes qtrees, what they are, why you need them, and their management.It also provides some examples of configuring file system quotas using qtrees.
5.1 What qtrees are
A qtree is a special type of directory, existing only in the root of an N series FlexVol or traditional volume). Because a qtree can only exist in the volume root, qtrees cannot be nested. However, multiple normal directories can be created within a qtree. A storage controller can contain many qtrees (about 4994 per volume).
A qtree directory has a number ...

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