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The default TCP keepalive value is currently 10s, resulting in clients being disconnected after 10 seconds of not replying to a TCP keepalive packet. These keepalive values are reasonable most of the times, but we've seen client disconnects where this timeout has been exceeded, resulting in fencing. The cause for this is unknown at this time, but it is suspected that network intermissions are happening. This change adds a configurable value for this specific client socket timeout. It enforces that its value is above UNRESPONSIVE_PROBES, whose value remains unchanged. The default value of 10000ms (10s) remains the trusted value. It is enirely unclear and untested what values are reasonable and which ones are not. Since the value of this setting can and will interact with other timeout values, care must be taken to not exceed certain other timeout values. I've tested this only briefly with values of 5000 and 25000. Outside that range is likely problematic. 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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