Look at iostat -x 10 10 when he active par tof your test is running. there should be something called svc_t - that should be in the 10ms range, and await should be low.
Will tell you if IO is slow, or if IO is not being issued. Also, ensure that you ain't swapping with something like "swapon -s" On Tue, Jan 25, 2011 at 3:04 PM, Oleg Proudnikov <ol...@cloudorange.com>wrote: > buddhasystem <potekhin <at> bnl.gov> writes: > > > > > > > Oleg, > > > > I'm a novice at this, but for what it's worth I can't imagine you can > have a > > _sustained_ 1kHz insertion rate on a single machine which also does some > > reads. If I'm wrong, I'll be glad to learn that I was. It just doesn't > seem > > to square with a typical seek time on a hard drive. > > > > Maxim > > > > Maxim, > > As I understand during inserts Cassandra should not be constrained by > random > seek time as it uses sequential writes. I do get high numbers on Windows > but > there is something that is holding back my Linux server. I am trying to > understand what it is. > > Oleg > > > >
