/Documentation/blockdev/drbd/drbd-connection-state-overview.dot

https://bitbucket.org/sammyz/iscream_thunderc-2.6.35-rebase · DOT · 85 lines · 53 code · 25 blank · 7 comment · 0 complexity · 9c69dcb6b2eaa8aaa9d2fb698b57a54c MD5 · raw file 

    

  1. // vim: set sw=2 sts=2 :
    2. 

  2. digraph {
    3. 

  3.   rankdir=BT
    4. 

  4.   bgcolor=white
    5. 

  5. 

  6.   node [shape=plaintext]
    7. 

  7.   node [fontcolor=black]
    8. 

  8. 

  9.   StandAlone     [ style=filled,fillcolor=gray,label=StandAlone ]
    10. 

  10. 

  11.   node [fontcolor=lightgray]
    12. 

  12. 

  13.   Unconnected    [ label=Unconnected ]
    14. 

  14. 

  15.   CommTrouble [ shape=record,
    16. 

  16.     label="{communication loss|{Timeout|BrokenPipe|NetworkFailure}}" ]
    17. 

  17. 

  18.   node [fontcolor=gray]
    19. 

  19. 

  20.   subgraph cluster_try_connect {
    21. 

  21.     label="try to connect, handshake"
    22. 

  22.     rank=max
    23. 

  23.     WFConnection   [ label=WFConnection ]
    24. 

  24.     WFReportParams [ label=WFReportParams ]
    25. 

  25.   }
    26. 

  26. 

  27.   TearDown       [ label=TearDown ]
    28. 

  28. 

  29.   Connected      [ label=Connected,style=filled,fillcolor=green,fontcolor=black ]
    30. 

  30. 

  31.   node [fontcolor=lightblue]
    32. 

  32. 

  33.   StartingSyncS  [ label=StartingSyncS ]
    34. 

  34.   StartingSyncT  [ label=StartingSyncT ]
    35. 

  35. 

  36.   subgraph cluster_bitmap_exchange {
    37. 

  37.     node [fontcolor=red]
    38. 

  38.     fontcolor=red
    39. 

  39.     label="new application (WRITE?) requests blocked\lwhile bitmap is exchanged"
    40. 

  40. 

  41.     WFBitMapT      [ label=WFBitMapT ]
    42. 

  42.     WFSyncUUID     [ label=WFSyncUUID ]
    43. 

  43.     WFBitMapS      [ label=WFBitMapS ]
    44. 

  44.   }
    45. 

  45. 

  46.   node [fontcolor=blue]
    47. 

  47. 

  48.   cluster_resync [ shape=record,label="{<any>resynchronisation process running\l'concurrent' application requests allowed|{{<T>PausedSyncT\nSyncTarget}|{<S>PausedSyncS\nSyncSource}}}" ]
    49. 

  49. 

  50.   node [shape=box,fontcolor=black]
    51. 

  51. 

  52.   // drbdadm [label="drbdadm connect"]
    53. 

  53.   // handshake [label="drbd_connect()\ndrbd_do_handshake\ndrbd_sync_handshake() etc."]
    54. 

  54.   // comm_error [label="communication trouble"]
    55. 

  55. 

  56.   //
    57. 

  57.   // edges
    58. 

  58.   // --------------------------------------
    59. 

  59. 

  60.   StandAlone -> Unconnected [ label="drbdadm connect" ]
    61. 

  61.   Unconnected -> StandAlone  [ label="drbdadm disconnect\lor serious communication trouble" ]
    62. 

  62.   Unconnected -> WFConnection [ label="receiver thread is started" ]
    63. 

  63.   WFConnection -> WFReportParams [ headlabel="accept()\land/or                        \lconnect()\l" ]
    64. 

  64. 

  65.   WFReportParams -> StandAlone [ label="during handshake\lpeers do not agree\labout something essential" ]
    66. 

  66.   WFReportParams -> Connected [ label="data identical\lno sync needed",color=green,fontcolor=green ]
    67. 

  67. 

  68.     WFReportParams -> WFBitMapS
    69. 

  69.     WFReportParams -> WFBitMapT
    70. 

  70.     WFBitMapT -> WFSyncUUID [minlen=0.1,constraint=false]
    71. 

  71. 

  72.       WFBitMapS -> cluster_resync:S
    73. 

  73.       WFSyncUUID -> cluster_resync:T
    74. 

  74. 

  75.   edge [color=green]
    76. 

  76.   cluster_resync:any -> Connected [ label="resnyc done",fontcolor=green ]
    77. 

  77. 

  78.   edge [color=red]
    79. 

  79.   WFReportParams -> CommTrouble
    80. 

  80.   Connected -> CommTrouble
    81. 

  81.   cluster_resync:any -> CommTrouble
    82. 

  82.   edge [color=black]
    83. 

  83.   CommTrouble -> Unconnected [label="receiver thread is stopped" ]
    84. 

  84. 

  85. }
    86.