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https://issues.apache.org/jira/browse/CASSANDRA-19575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17838992#comment-17838992
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Morten Joenby commented on CASSANDRA-19575:
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According to the debug.log it's not an error as such, but just an incorrect
check:
{code:java}
INFO [main] 2024-04-18 11:40:20,139 SigarLibrary.java:178 - Checked OS
settings and found them configured for optimal performance.
DEBUG [main] 2024-04-18 11:40:20,141 StartupChecks.java:424 - No
'read_ahead_kb' setting found for device /dev/md0 of data directory
/var/lib/cassandra/data.
DEBUG [main] 2024-04-18 11:40:20,146 StartupChecks.java:512 - Checking
directory /var/lib/cassandra/data
DEBUG [main] 2024-04-18 11:40:20,149 StartupChecks.java:512 - Checking
directory /commitlogs
DEBUG [main] 2024-04-18 11:40:20,149 StartupChecks.java:512 - Checking
directory /var/lib/cassandra/data/saved_caches
DEBUG [main] 2024-04-18 11:40:20,150 StartupChecks.java:512 - Checking
directory /var/lib/cassandra/data/hints{code}
> StartupCheck error for read_ahead_kb
>
>
> Key: CASSANDRA-19575
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19575
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Startup and Shutdown
>Reporter: Morten Joenby
>Priority: Normal
>
> We believe the StartupChecks.java has a minor bug here:
> [https://github.com/apache/cassandra/blob/cassandra-4.1/src/java/org/apache/cassandra/service/StartupChecks.java#L737]
> {code:java}
> String deviceName = blockDirComponents[2].replaceAll("[0-9]*$", "");{code}
> We are using a RAID setup with two disks, so removing the "[0-9]" makes the
> check fail:
> cat /sys/block/md/queue/read_ahead_kb
> cat: /sys/block/md/queue/read_ahead_kb: No such file or directory
> It should be "md0" in our case, so removing the '0' won't work.
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