Paulo Motta created CASSANDRA-16436:
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Summary: Add startup check for large read_ahead_kb setting
Key: CASSANDRA-16436
URL: https://issues.apache.org/jira/browse/CASSANDRA-16436
Project: Cassandra
Issue Type: Improvement
Components: Local/Startup and Shutdown
Reporter: Paulo Motta
A well known production tuning recommendation is to dial back the
{{read_ahead_kb}} Linux setting from the default of 4096 in most distributions
as this can cause high IO usage and cache churn on read-intensive workloads.
We should add a startup warning to detect when a high {{read_ahead_kb}} is used
and recommend the user to dial back to a reasonable value, which varies
according to the workload but a general guideline is to tune this to 8kb.
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