The Terabyte Analysis Machine for Sloan Digital Sky Survey Data uses a commodity beowulf cluster to access terabyte scale disk farms. The nodes of the cluster share the disk by using: a) a fibre channel network, and b) the Global File System, a GPL'd Linux file system. GFS uses a hardware file locking method to allow multiple client access to files, and a journaling method to prevent corruption of the file system upon a client node crash. We present the results of our scaling tests on GFS, and our experience in general with this new file system.

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