C. Scott Andreas updated CASSANDRA-12907:
    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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