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authorAlex Auvolat <alex@adnab.me>2023-09-22 16:09:17 +0200
committerAlex Auvolat <alex@adnab.me>2023-09-22 16:14:47 +0200
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tree754d15f2ab54207d67f9829357646282fa04cbee /doc/book/operations/layout.md
parent8d07888fa2da8f72aa1e7e63bfd9ac9eb3b1e6ab (diff)
downloadgarage-0e5925fff6d9b3147de4967e1963b4c785d0055f.tar.gz
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layout doc: reformulatenew-layout-ux
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diff --git a/doc/book/operations/layout.md b/doc/book/operations/layout.md
index 0eb0e215..ece17ddb 100644
--- a/doc/book/operations/layout.md
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@@ -94,12 +94,13 @@ follow the following recommendations:
## Understanding unexpected layout calculations
When adding, removing or modifying nodes in a cluster layout, sometimes
-unexpected assigntations of partitions to node can occure. These assignations
+unexpected assigntations of partitions to node can occur. These assignations
are in fact normal and logical, given the objectives of the algorihtm. Indeed,
**the layout algorithm prioritizes moving less data between nodes over the fact
-of achieving equal distribution of load**. This section presents two examples
-and illustrates how one can control Garage's behavior to obtain the desired
-results.
+of achieving equal distribution of load. It also tries to use all links between
+pairs of nodes in equal proportions when moving data.** This section presents
+two examples and illustrates how one can control Garage's behavior to obtain
+the desired results.
### Example 1
@@ -266,8 +267,8 @@ This explains why node3 ends with 75% utilization (100% from before minus 25%
that is moved to node1), and node4 ends with 25% (50% from before minus 25%
that is moved to node1).
-This illustrates another principle of the layout computation: **if there is a
-choice in moving data out of some nodes, then all links between pairs of nodes
-are used in equal proportions** (this is approximately true, there is
+This illustrates the second principle of the layout computation: **if there is
+a choice in moving data out of some nodes, then all links between pairs of
+nodes are used in equal proportions** (this is approximately true, there is
randomness in the algorihtm to achieve this so there might be some small
fluctuations, as we see above).