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I'm seeing consistent CPU soft lockups in block_free_work on my bare metal system that aren't reached by VM instances. The reason is that the bare metal machine has a ton more memory available causing the block free work queue to grow much larger in size, and then it has so much work that it can take 30+ seconds before it goes through it all. This is all with a debug kernel. A non debug kernel will likely zoom through the outstanding work here at a much faster rate. 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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