You can easily do this with bcache or LVM http://rustyrazorblade.com/post/2018/2018-04-24-intro-to-lvm/.
Medusa might be a good route to go down if you want to do backups instead: https://thelastpickle.com/blog/2019/11/05/cassandra-medusa-backup-tool-is-open-source.html On Thu, Dec 5, 2019 at 12:21 PM Carl Mueller <carl.muel...@smartthings.com.invalid> wrote: > Does anyone have experience tooling written to support this strategy: > > Use case: run cassandra on i3 instances on ephemerals but synchronize the > sstables and commitlog files to the cheapest EBS volume type (those have > bad IOPS but decent enough throughput) > > On node replace, the startup script for the node, back-copies the sstables > and commitlog state from the EBS to the ephemeral. > > As can be seen: > https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html > > the (presumably) spinning rust tops out at 2375 MB/sec (using multiple EBS > volumes presumably) that would incur about a ten minute delay for node > replacement for a 1TB node, but I imagine this would only be used on higher > IOPS r/w nodes with smaller densities, so 100GB would be about a minute of > delay only, already within the timeframes of an AWS node > replacement/instance restart. > > >
