Ubicloud seems very cool, but I wonder what the long term plan for volumes is. Without network attached storage (EBS), running stateful services is tricky.
The general plan is: write a SPDK module. We spent some of the last year getting used to using SPDK, for cryptography and workaday disk access, and the first copy-on-access custom bdev (a unit of abstraction in SPDK) is working its way into production now.
Right now, we have an early block store (EBS) that is non-replicated, and that we are testing and using internally. Over time, we will expose it as a service as well. But object store (S3) will come first.
