On Saturday 10 of February 2018 23:09:40 Dan Kinder wrote: > 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).
Considered putting cassandra data on lvmcache? We are using this on small (3x2TB compressed data, 128/256MB cache) clusters since reaching I/O limits of 2xHDD in RAID10. -- Mateusz Korniak "(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa." Nikos Kazantzakis - "Grek Zorba" --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org