BVLog Bryan Voss’ mental synchronization point


Disk space and treemaps

One of the things a sysadmin must occasionally struggle with is disk space. (I just provisioned 500GB to that filesystem a year ago and it's already less than 10% free??) Although just adding more disk space is a brute force method of resolving the immediate issue, it's usually a good idea to find out what is taking up the space and whether it can be reduced by deleting large unnecessary or infrequently used files. I have a couple of tools that are useful for providing the info needed to do some cleanup.

SequoiaView is a handy way to get a quick overview of a filesystem and see if any particular files or directories are taking up the majority of available space. Files are displayed as rectangles sized according to the relative amount of space they consume. This makes it easy to find things like Windows servicepack installers and other temporary files hanging around in temp directories taking up a lot of space.

SequoiaView is a free Windows application.


Another useful tool that I have found is JDiskReport, which provides various charts depicting largest files, oldest files, types of files, distribution of files based on modification time, etc.

JDiskReport is a free cross-platform Java-based app which can be installed or run via Java WebStart.


I generally start with SequoiaView to get a quick overview of large files, then use JDiskReport if I need to get more detailed info.

So there you go. Download some utils and get started cleaning up those old crufty files that are taking up all your space.

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