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https://issues.apache.org/jira/browse/CASSANDRA-16104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210414#comment-17210414
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Dmitrii Saprykin commented on CASSANDRA-16104:
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I have extended *StorageServiceMBean* with method *getConcurrentCompactors* and
changed *checkJobs* to validate --jobs parameter using JMX
> Wrong warning about data volumes capacity
> -----------------------------------------
>
> Key: CASSANDRA-16104
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16104
> Project: Cassandra
> Issue Type: Bug
> Reporter: Dmitrii Saprykin
> Priority: Normal
>
> I see the following warning trying to run *nodetool upgradesstables*
> {noformat}
> WARN 16:09:24 Only 34988 MB free across all data volumes. Consider adding
> more capacity to your cluster or removing obsolete snapshots
> {noformat}
> This warning is wrong because the wrong storage device capacity gets tested.
> All my cassandra data paths are subdirectories of */data* mount point which
> has enough of space:
> {noformat}
> $ df -h /data
> Filesystem Size Used Avail Mounted on
> ................. 1.2T 200G 1T /data
> {noformat}
> However what Warning reports is a OS mount which has nothing to do with
> Cassandra configuration:
> {noformat}
> df -h /
> Filesystem Size Used Avail Use% Mounted on
> ............ 40G 5.7G 35G 15% /
> {noformat}
> I see this error running Cassandra 3.0.22
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