Device-mapper clone target

block-beta
columns 3
block:src_node["node 1\n\n\n\n\n\n\n\n"]:1
  columns 3
  space:3
  space:3
  space:2 src_a[("source")]
end
space:1
block:dst_node["node 2\n\n\n\n\n\n\n\n"]:1
  columns 3
  space:2
  clone[("clone")]:1
  space:3
  src[("source")]
  md[("metadata")]
  dst[("destination")]
  src --> clone
  md --> clone
  clone --> md
  dst <--> clone
  clone --> dst
end
src_a --"iSCSI / NVMeoF / ..."--> src
classDef remote stroke-dasharray: 5 5;
classDef node fill:#ffdead;
class src remote
class src_nodel, dst_node node

• multi-attachment for live-migration?
• failure modes
  • failure of source node + network partitions
    • IO errors => FS read-only, data unavailable
    • dm-clone retries indefinitly => recoverable
  • failure of destination node
    • data unavailable until recovery
    • driver should reconstruct the dm-clone target

---

prev TOC next