Based on the documentation, it is clear that with Cassandra you want to have one disk for commitlog, and one disk for data.
My question is: If you think your workload is going to require more io performance to the data disks than a single disk can handle, how would you recommend effectively utilizing additional disks? It would seem a number of vendors sell 1U boxes with four 3.5 inch disks. If we use one for commitlog, is there a way to have Cassandra itself equally split data across the three remaining disks? Or is this something that needs to be handled by the hardware level, or operating system/file system level? Options include a hardware RAID controller in a RAID 0 stripe (this is more $$$ and for what gain?), or utilizing a volume manager like LVM. Along those same lines, if you do implement some type of striping, what RAID stripe size is recommended? (I think Todd Burruss asked this earlier but I did not see a response) Thanks for any input! -Eric
