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https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081679#comment-13081679
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Chris Burroughs commented on CASSANDRA-2749:
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It would also be cool (but this is obviously speculative) to have the ability
to keep Index files on an SSD, and the larger data files on rotating disks.
> fine-grained control over data directories
> ------------------------------------------
>
> Key: CASSANDRA-2749
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2749
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Pavel Yaskevich
> Priority: Minor
> Fix For: 1.0
>
>
> Currently Cassandra supports multiple data directories but no way to control
> what sstables are placed where. Particularly for systems with mixed SSDs and
> rotational disks, it would be nice to pin frequently accessed columnfamilies
> to the SSDs.
> Postgresql does this with tablespaces
> (http://www.postgresql.org/docs/9.0/static/manage-ag-tablespaces.html) but we
> should probably avoid using that name because of confusing similarity to
> "keyspaces."
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