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https://issues.apache.org/jira/browse/CASSANDRA-12907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-12907:
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Component/s: Core
> Different data directories for SSDs and HDDs at configuration level
> -------------------------------------------------------------------
>
> Key: CASSANDRA-12907
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12907
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Natale Galioto
> Priority: Major
> Labels: performance
>
> Currently, users can speed up some CFs by symlinking its data directory to
> fast media such as SSDs. In my opinion, instead, configuration file should
> allow two different sets of directory: one dedicated to spindles, one
> dedicated to SSDs.
> This would allow a "once and for all mixed SSD & HDD configuration", instead
> of continuously symlinking the "right" directory each time a CF is created
> (due to the name mangling of the CF directories).
> And this in turn would allow a priori knowledge on disk structures, and would
> allow to place indexes of all sort (lookup, partition, etc... everything that
> is needed to "just" locate data) on fast SSDs, speeding up ALL the CFs
> instead of only one, while the HDDs could be used just for data retrieval and
> sequential reads.
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