On Sat, Jul 18, 2015 at 10:09 AM, J. Ryan Earl <o...@jryanearl.us> wrote:
> Even with https://issues.apache.org/jira/browse/CASSANDRA-7386 data > balancing across JBOD setups is pretty horrible. Having used JBOD for > about 2 years from 1.2.x and up, it is my opinion JBOD on Cassandra is > nascent at best and far from mature. For a variety of reasons, JBOD should > perform better if IO and data is balanced across multiple devices due to > things like linux device queues, striping overhead, access contention, and > so forth. However, data and access patterns simply are not balanced in > Cassandra JBOD setups. > I have heard this, especially with STS, over the years from many different reporters. JBOD seems to be best (only? for the case where you have actual physical disks you can replace and want nodes to continue to serve reads in the short time until you do, and where you don't mind the cost of imbalance. =Rob
