The usage for SSD that you've described do make sense ( spill, temp files, ... ) for SSD. We've also seen a good performance benefit in using them for zookeeper disks. IMHO, it will be better to use the SSD budget and invest it into additional servers. Having said that, I know few customers which have decided to use SSD for their HBase clusters in order to get the best performance. The second part of your question is much easier to answer. HDFS is supporting tier storage which let you define different class of storages. You can find some further information on heterogeneous storage at : http://hortonworks.com/blog/heterogeneous-storages... http://www.ebaytechblog.com/2015/01/12/hdfs-storag... http://www.slideshare.net/Hadoop_Summit/reduce-sto...
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