Hi, We are running a test with Cassandra 2.1.2 on Fusion I/O drives where we load about 2 billion rows of data during a few hours each night onto a 6-node cluster, but compactions that run 24/7 don't seem to be keeping up as the number of SSTables keep growing and our disks seem way underutilized. We are getting write throughputs during compactions of 300 - 500 kB/sec while other non-Cassandra servers with the same hardware have continuous write loads of 25 MB/sec.
We were initially running with Leveled compaction with compaction throughput set to 0 and tested the leveled compaction with 2, 8 and 16 concurrent compactors. We have just switched to size-tiered compaction (but the disk utilization does not seem to increase. Anyone have any idea on how to increase Cassandra's disk utilization for compaction? Thanks, William
