the virtual block device to a file. For example, block device /dev/sda corresponds to file /foo/bar in CurveBS 2. The address space of the block device /dev/sda maps to chunks of file in the system address space of 4 to 8MB in /dev/sda. The size of chunk can be configured 3. Each file (/foo/bar) contains chunks scattered all over the storage nodes. ChunkServer provides 4KB random read/write

30 $ ETCDCTL_API=3 ./bin/etcdctl put foo bar $ ETCDCTL_API=3 ./bin/etcdctl get foo --write-out=json revision: 2 $ ETCDCTL_API=3 ./bin/etcdctl put foo bar $ ETCDCTL_API=3 ./bin/etcdctl get foo --write-out=json

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