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https://issues.apache.org/jira/browse/CASSANDRA-16436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17468086#comment-17468086
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Brandon Williams commented on CASSANDRA-16436:
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Looks good, failures are not related. +1
A minor nit is it would be nice to add some "or lower" language to the
recommendations since that is generally the direction people should vary from
the recommendation if they do.
> 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
> Assignee: Kanthi Subramanian
> Priority: Normal
> Labels: AdventCalendar2021, lhf
>
> 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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