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Re:Announcing Linode Block Storage Volumes by AFNobody on Thursday February 01, 2018 @03:54PM (#16285783)
Its probably custom to be 100% honest. The only host I know offering that stuff out of the box using open source is OVH using OpenStack.
Re:Announcing Linode Block Storage Volumes by antongribok on Thursday February 01, 2018 @04:18PM (#16286002)
DO is using Ceph.

OVH is using Ceph as well (that talks to OpenStack) as far as I know.