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Two test programs are added. The run time is about 1min on my el7 instance. The test script finishes up with a read/write mmap test on offline extents to verify the data wait paths in those functions. One program will perform vfs read/write and mmap read/write calls on the same file from across 5 threads (mounts) repeatedly. The goal is to assure there are no locking issues between read/write paths. The second test program performs consistency checking on a file that is repeatedly written/read using memory maps and normal reads and writes, and the content is verified after every operation. Signed-off-by: Auke Kok <auke.kok@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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