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A few callers of alloc_move_empty in the server were providing a budget that was too small. Recent changes to extent_mod_blocks increased the max budget that is necessary to move extents between btrees. The existing WAG of 100 was too small for trees of height 2 and 3. This caused looping in production. We can increase the move budget to half the overall commit budget, which leaves room for a height of around 7 each. This is much greater than we see in practice because the size of the per-mount btrees is effectiely limited by both watermarks and thresholds to commit and drain. 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
Community Mailing List
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