Re: High disk I/O during reads

2013-03-25 Thread Jon Scarborough
ot;, > and see if things are roughly the same across all the nodes. You could > also just be under capacity, but more likely, there's an actual > problem looming somewhere. > > Cheers! > -Matt > > On Sat, Mar 23, 2013 at 3:18 AM, wrote: > > You can try to disabl

Re: High disk I/O during reads

2013-03-22 Thread Jon Scarborough
rgram, it tells you more about > the number of SSTable involved and read/write latency. Somtimes average > doesn't tell you the whole storey. > Also check your nodetool tpstats, are there a lot dropped reads? > > -Wei > - Original Message - > From: "Jon Scarboroug

Re: High disk I/O during reads

2013-03-22 Thread Jon Scarborough
gt; > Are your Keys spread across all SSTables ? That will cause every sstable > read which will increase the I/O. > > What compaction are you using ? > > From: zod...@fifth-aeon.net<mailto:zod...@fifth-aeon.net> [mailto: > zod...@fifth-aeon.net] On Behalf Of Jon Scarboroug

High disk I/O during reads

2013-03-21 Thread Jon Scarborough
Hello, We've had a 5-node C* cluster (version 1.1.0) running for several months. Up until now we've mostly been writing data, but now we're starting to service more read traffic. We're seeing far more disk I/O to service these reads than I would have anticipated. The CF being queried consists of