diff --git a/docs/diagrams/sequence/fuse_operations/fallocate.puml b/docs/diagrams/sequence/fuse_operations/fallocate.puml
new file mode 100644
index 0000000..b0ce4f5
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/fallocate.puml
@@ -0,0 +1,40 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+title "Allocate space for opened file"
+
+participant Client
+control SiteA
+boundary SiteB
+boundary "Other Sites" as Others
+
+Client -> SiteA ++ : fallocate
+SiteA -> SiteA : Check owner
+alt SiteA is owner
+
+    SiteA -> SiteA : Allocate space
+    alt No space left
+
+        SiteA --> Client : No space left\non device
+
+    end
+
+    SiteA ->> Others : Section changed
+
+else SiteB is owner
+
+    SiteA -> SiteB ++ : Allocate space
+
+        SiteB -> SiteB : Allocate space
+        SiteB ->> Others : Section changed
+        SiteB --> SiteA -- : Done
+
+    SiteA ->> SiteA : Update cache
+
+end
+SiteA --> Client -- : Done
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/init.puml b/docs/diagrams/sequence/fuse_operations/init.puml
new file mode 100644
index 0000000..b321627
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/init.puml
@@ -0,0 +1,22 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+title "Initialize FS"
+
+control SiteA
+boundary "Other Sites" as Others
+
+SiteA ++
+SiteA -> Others ++ : TCP-Connect
+
+SiteA -> Others : Get Indexes
+Others --> SiteA : Indexes
+note right
+Indexes without
+entries from SiteA
+end note
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/open-r.puml b/docs/diagrams/sequence/fuse_operations/open-r.puml
new file mode 100644
index 0000000..b51ba69
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/open-r.puml
@@ -0,0 +1,19 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+title "Open Read"
+
+participant Client
+control SiteA
+
+
+Client -> SiteA ++ : Open [r]
+
+    SiteA -> SiteA : Check availablility
+
+SiteA --> Client -- : File opened
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/open-rw_local_not-owner.puml b/docs/diagrams/sequence/fuse_operations/open-rw_local_not-owner.puml
new file mode 100644
index 0000000..c13bbb2
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/open-rw_local_not-owner.puml
@@ -0,0 +1,50 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+header "Local\nNot Owner"
+title "Open Read&Write"
+
+participant Client
+control SiteA
+boundary SiteB
+boundary "Other Sites" as Others
+
+
+Client -> SiteA ++ : Open [rw]
+    
+    SiteA -> SiteA : Check owner
+    alt SiteB is owner
+
+        SiteA -> SiteA : Check availablility
+        alt File is locally available
+
+            SiteA -> SiteB ++ : Transfer ownership
+
+            SiteB -> SiteB : Lock file
+            alt Already locked
+
+                SiteB --> SiteA : File is locked
+                SiteA --> Client : File is locked
+
+            else Locked
+
+                SiteB ->> Others : File locked &\nOwnership changed
+                note left
+                    Distribute Info
+                    about Lock & Ownership
+                end note
+
+                SiteB --> SiteA -- : Ready
+
+                SiteA --> Client -- : File opened
+
+            end
+        
+        end
+
+    end
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/open-rw_local_owner.puml b/docs/diagrams/sequence/fuse_operations/open-rw_local_owner.puml
new file mode 100644
index 0000000..61d5d36
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/open-rw_local_owner.puml
@@ -0,0 +1,44 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+header "Local\nOwner"
+title "Open Read&Write"
+
+participant Client
+control SiteA
+boundary "Other Sites" as Others
+
+
+Client -> SiteA ++ : Open [rw]
+    
+    SiteA -> SiteA : Check owner
+    alt Client is owner
+
+        SiteA -> SiteA : Lock file
+        alt Already locked
+
+            SiteA --> Client : File is locked
+
+        else Locked
+
+            SiteA ->> Others : File locked
+            note left
+                Distribute Info
+                about Lock
+            end note
+
+        end
+
+    end
+
+    SiteA -> SiteA : Check availablility
+    alt Locally available
+
+        SiteA --> Client -- : File opened
+
+    end
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/open-rw_not-local_not-owner.puml b/docs/diagrams/sequence/fuse_operations/open-rw_not-local_not-owner.puml
new file mode 100644
index 0000000..e92c79f
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/open-rw_not-local_not-owner.puml
@@ -0,0 +1,54 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+header "Not Local\nNot Owner"
+title "Open Read&Write"
+
+participant Client
+control SiteA
+boundary SiteB
+boundary "Other Sites" as Others
+
+
+Client -> SiteA ++ : Open [rw]
+    
+    SiteA -> SiteA : Check owner
+    alt SiteB is owner
+
+        SiteA -> SiteA : Check availablility
+        alt File is not locally available
+
+            SiteA -> SiteB ++ : Lock file
+
+            SiteB -> SiteB : Lock file
+            alt Already locked
+
+                SiteB --> SiteA : File is locked
+                SiteA --> Client : File is locked
+
+            else Locked
+
+                SiteB ->> Others : File locked
+                note left
+                    Distribute Info
+                    about Lock
+                end note
+
+                SiteB --> SiteA -- : Ready
+                SiteA --> Client -- : File opened
+
+                note right 
+                    When reading or writing,
+                    data will now be streamed.
+                    > See read.puml for more Info
+                end note
+            end
+        
+        end
+
+    end
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/read.puml b/docs/diagrams/sequence/fuse_operations/read.puml
new file mode 100644
index 0000000..ef354f2
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/read.puml
@@ -0,0 +1,33 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+title "Read from opened file"
+
+participant Client
+control SiteA
+boundary SiteB
+
+
+Client -> SiteA ++ : Read Section
+    
+    SiteA -> SiteA : Check availablility
+    alt Not locally available
+
+        SiteA -> SiteB ++ : Read Section
+        SiteB --> SiteA -- : Section-Data
+        note right
+        Section-Data is
+        being  streamed
+        end note
+
+        SiteA ->> SiteA ++ : Save in cache
+        SiteA --
+
+    end
+
+SiteA --> Client -- : Section-Data
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/fuse_operations/write.puml b/docs/diagrams/sequence/fuse_operations/write.puml
new file mode 100644
index 0000000..b034ce5
--- /dev/null
+++ b/docs/diagrams/sequence/fuse_operations/write.puml
@@ -0,0 +1,39 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+title "Write to opened file"
+
+participant Client
+control SiteA
+boundary SiteB
+boundary "Other Sites" as Others
+
+Client -> SiteA ++ : Section-Data
+SiteA -> SiteA : Check owner
+alt SiteA is owner
+
+    SiteA -> SiteA ++ : Save Data
+    SiteA --> SiteA -- : Done
+
+    SiteA ->> Others : Section changed
+
+else SiteB is owner
+
+    SiteA -> SiteA ++ : Save in cache
+    note right : Write-Back Cache
+
+    SiteA ->> SiteB ++ : Write Section-Data
+
+        SiteB -> SiteB ++ : Save Data
+        SiteB--
+        SiteB ->> Others -- : Section changed
+
+    SiteA --> SiteA -- : Done
+
+end
+SiteA --> Client -- : Done
+
+@enduml
\ No newline at end of file
diff --git a/docs/diagrams/sequence/heartbeat.puml b/docs/diagrams/sequence/heartbeat.puml
new file mode 100644
index 0000000..f749a0b
--- /dev/null
+++ b/docs/diagrams/sequence/heartbeat.puml
@@ -0,0 +1,25 @@
+@startuml
+autonumber
+hide footbox
+
+footer "LTDFS | Ruakij"
+
+header "Every few seconds"
+title "Heartbeat"
+
+control SiteA
+boundary "Other Sites" as Others
+
+SiteA ++
+SiteA -> SiteA : Get latest changes\nin local cache
+note right
+Changes since
+last heartbeat
+end note
+
+SiteA ->> Others ++ : Distribute changed\nlocal-cache-indexes
+SiteA--
+
+Others -> Others : Apply changes to\navailability-index
+
+@enduml
\ No newline at end of file