IBM Support

About qtrees and Network Appliance Filers

Technote (FAQ)


What is a qtree when using a Network Appliance Filer with IBM® Rational® ClearCase®?


Data on a Network Appliance Filer is organized in volumes. A volume is an independent file system with its own RAID group(s). Every RAID group must contain at least two disks. Each filer must have a root volume to boot (named /vol/vol0).

A qtree is a special subdirectory of the root directory of a volume that gives greater flexibility when storage needs do not demand multiple volumes. Volumes are themselves considered a qtree and can be the target of qtree commands. Therefore, it is recommended to use qtrees from the start.

For more information, refer to the following url,

Related information

Disable Disk Quotas on NAS

Document information

More support for: Rational ClearCase
Interop: NAS

Software version: 7.1.2, 8.0, 8.0.1

Operating system(s): AIX, HP-UX, IRIX, Linux, Solaris, Windows

Reference #: 1125802

Modified date: 07 August 2008

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