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Zach Brown
26ae9c6e04
The fence script we use for our single node multi-mount tests only knows how to fence by using forced unmount to destroy a mount. As of now, the tests only generate failing nodes that need to be fenced by using forced unmount as well. This results in the awkward situation where the testing fence script doesn't have anything to do because the mount is already gone. When the test fence script has nothing to do we might not notice if it isn't run. This adds explicit verification to the fencing tests that the script was really run. It adds per-invocation logging to the fence script and the test makes sure that it was run. While we're at it, we take the opportunity to tidy up some of the scripting around this. We use a sysfs file with the data device major:minor numbers so that the fencing script can find and unmount mounts without having to ask them for their rid. They may not be operational. Signed-off-by: Zach Brown <zab@versity.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
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