Ceph Block Storage
Block storage will be familiar to those who have worked with traditional SAN (Storage Area Network) technologies. Allocations of desired capacity are provisioned on demand and presented as contiguous statically-sized volumes (sometimes referred to as images). Ceph RBD supports volumes up to 16 exabytes in size. These volumes are attached to the client operating system as virtualized disk drives that can be utilized much like local physical drives. In virtualized environments the attachment point is often at the hypervisor level (eg. QEMU / KVM). The hypervisor then presents volumes to the guest operating system via the virtio driver or as an emulated IDE or SCSI disk.Usually a filesystem is then created on the volume for ...
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