[jira] [Commented] (CASSANDRA-19575) StartupCheck error for read_ahead_kb

2024-04-19 Thread Brandon Williams (Jira) 


[ 
https://issues.apache.org/jira/browse/CASSANDRA-19575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17839022#comment-17839022
 ] 

Brandon Williams commented on CASSANDRA-19575:
--

I think instead of trying to decompose the specified device name to a block 
device, it would be better to list all the block devices and compare against 
device names.

> 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
> Fix For: 4.1.x, 5.0.x, 5.x
>
>
> 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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[jira] [Commented] (CASSANDRA-19575) StartupCheck error for read_ahead_kb

2024-04-19 Thread Morten Joenby (Jira) 


[ 
https://issues.apache.org/jira/browse/CASSANDRA-19575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17838992#comment-17838992
 ] 

Morten Joenby commented on CASSANDRA-19575:
---

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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