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Posted to commits@cassandra.apache.org by "Hanson (JIRA)" <ji...@apache.org> on 2014/07/15 11:26:04 UTC

[jira] [Created] (CASSANDRA-7549) Heavy Disk Read I/O

Hanson created CASSANDRA-7549:
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             Summary: Heavy Disk Read I/O
                 Key: CASSANDRA-7549
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7549
             Project: Cassandra
          Issue Type: Improvement
         Environment: Cassandra 2.0.6
            Reporter: Hanson


We observed heavy disk Read I/O, sometimes almost ~100% disk I/O %util. The block size for Disk Read seems too small per “iostat”: 
	- DB Query: ~40KB per read
	- SSTables Compaction : ~120KB per read

Could it use larger block size for Disk Read? (from Cassandra or OS disk driver tuning)




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