doc(1.7.0): add Replica Auto Balance Disk Pressure Threshold to aut…

…o balance replicas longhorn/longhorn-4105 Signed-off-by: Chin-Ya Huang <[email protected]>
longhorn · Jul 5, 2024 · 04aa8ef · 04aa8ef
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diff --git a/content/docs/1.7.0/high-availability/auto-balance-replicas.md b/content/docs/1.7.0/high-availability/auto-balance-replicas.md
@@ -104,3 +104,13 @@ parameters:
   staleReplicaTimeout: "2880" # 48 hours in minutes
   fromBackup: ""
 ```
+
+## Replica Auto Balance Disk Pressure Threshold (%)
+
+When `Replica Auto Balance` is enabled with `best-effort`, you can set a `Replica Auto Balance Disk Pressure Threshold (%)`. This threshold defines the disk usage level at which Longhorn will automatically attempt to migrate replicas to another disk on the same node.
+
+For example, if the threshold is set to 75%, Longhorn will try to migrate replicas sequentially when the disk consumption reaches 75% capacity.
+
+Longhorn prioritizes balancing replicas across node and zone first. Once the node and zones are balanced, it will then consider balancing within a single node based on disk pressure.
+
+Since Longhorn v1.7.0, when rebuilding replicas on the same node, Longhorn uses local file data synchronization for more efficient data transfer.