Merge pull request openshift#7697 from ahardin-rh/enterprise-3.9-stage

[enterprise-3.9] Bug 1512781, updated the Scenario math

Author: ahardin-rh

admin_guide/out_of_resource_handling.adoc

@@ -563,7 +563,7 @@ If a node has 10 Gi of capacity, and you want to reserve 10% of that capacity fo
 
 ----
 capacity = 10 Gi
-system-reserved = 10 Gi * .01 = 1 Gi
+system-reserved = 10 Gi * .1 = 1 Gi
 ----
 
 The amount of allocatable resources becomes:
@@ -575,21 +575,24 @@ allocatable = capacity - system-reserved = 9 Gi
 This means by default, the scheduler will schedule pods that request 9 Gi of
 memory to that node.
 
-If you want to turn on eviction so that eviction is triggered when the node observes that available memory falls below 10% of capacity for 30 seconds, or
-immediately when it falls below 5% of capacity, you need the scheduler to see allocatable as 8Gi. Therefore, ensure your system reservation covers the greater of your eviction thresholds.
+If you want to turn on eviction so that eviction is triggered when the node
+observes that available memory falls below 10% of capacity for 30 seconds, or
+immediately when it falls below 5% of capacity, you need the scheduler to see
+allocatable as 8Gi. Therefore, ensure your system reservation covers the greater
+of your eviction thresholds.
 
 ----
 capacity = 10 Gi
-eviction-threshold = 10 Gi * .05 = .5 Gi
-system-reserved = (10Gi * .01) + eviction-threshold = 1.5 Gi
-allocatable = capacity - system-reserved = 8.5 Gi
+eviction-threshold = 10 Gi * .1 = 1 Gi
+system-reserved = (10Gi * .1) + eviction-threshold = 2 Gi
+allocatable = capacity - system-reserved = 8 Gi
 ----
 
 Enter the following in the *_node-config.yaml_*:
 ----
 kubeletArguments:
   system-reserved:
-  - "8.5Gi"
+  - "2Gi"
   eviction-hard:
   - memory.available<.5Gi
   eviction-soft: