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From Dan Kinder <>
Subject storing indexes on ssd
Date Sun, 11 Feb 2018 07:09:40 GMT

We're optimizing Cassandra right now for fairly random reads on a large
dataset. In this dataset, the values are much larger than the keys. I was
wondering, is it possible to have Cassandra write the *index* files
(*-Index.db) to one drive (SSD), but write the *data* files (*-Data.db) to
another (HDD)? This would be an overall win for us since it's
cost-prohibitive to store the data itself all on SSD, but we hit the limits
if we just use HDD; effectively we would need to buy double, since we are
doing 2 random reads (index + data).


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