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Testing and verification of cluster filesystems

Although software testing can never prove a program is correct, it can catch many errors early and plays an important part in the process of declaring a program "stable" and ready for release. Cluster filesystems (e.g. GFS2), by their very nature require hardware intensive test environments, and are thus also expensive to test. This tends to limit test coverage compared with their simpler, single node counterparts (ext2/3/4, xfs, etc).

Since reliability is a key feature of any filesystem, this paper considers a number of techniques which may be used to help simulate a cluster on a single node, reducing the cost of testing and increasing the coverage in the process. Although GFS2 is taken as the example filesystem, the techniques described are generic and apply to any similar filesystem.

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