CPU is idle (< 10% usage). Disk reads occasionally blocks over 32/64K. Writes around 0-5MB per second. Network traffic 0.1 / 0.1 MB/s (in / out). Paging 0. System int ~ 1300, csw ~ 2500.
2012/1/5 Philippe <watche...@gmail.com> > What can you see in vmstat/dstat ? > Le 5 janv. 2012 11:58, "R. Verlangen" <ro...@us2.nl> a écrit : > > Hi there, >> >> I'm running a cassandra 0.8.6 cluster with 2 nodes (in 2 DC's), RF = 2. >> Actual data on the nodes is only 1GB. Disk latency < 1ms. Disk throughput ~ >> 0.4MB/s. OS load always below 1 (on a 8 core machine with 16GB ram). >> >> When I'm running my writes against the cluster with cl = ONE all reads >> appear to be faster then the writes. >> >> Average write speed = 1600us/operation >> Average read speed = 200us/operation >> >> I'm really wondering why this is the case. Anyone got a clue? >> >> With kind regards, >> Robin >> >
