ravening opened a new pull request #4259:
URL: https://github.com/apache/cloudstack/pull/4259
## Description
<!--- Describe your changes in detail -->
By default cloudstack reserves 1Gb of RAM in hosts
using _dom0_memory field. Add a global setting
"host.reserved.mem.mb" which can used to either
increase or decrese the amount of memory which can be reserved
## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all the
boxes that apply: -->
- [X] Enhancement (improves an existing feature and functionality)
## Screenshots (if appropriate):
## How Has This Been Tested?
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<!-- Include details of your testing environment, and the tests you ran to
-->
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Total capacity and RAM of each host before setting the global setting
```
mysql> select total_capacity,used_capacity from op_host_capacity where
capacity_type=0\G
*************************** 1. row ***************************
total_capacity: 7297130496
used_capacity: 6174015488
*************************** 2. row ***************************
total_capacity: 7297130496
used_capacity: 0
*************************** 3. row ***************************
total_capacity: 7297130496
used_capacity: 0
3 rows in set (0.00 sec)
mysql> select dom0_memory,ram from host where type="Routing" and removed is
null\G
*************************** 1. row ***************************
dom0_memory: 1073741824
ram: 7297130496
*************************** 2. row ***************************
dom0_memory: 1073741824
ram: 7297130496
*************************** 3. row ***************************
dom0_memory: 1073741824
ram: 7297130496
3 rows in set (0.01 sec)
```
setting global setting `host.reserved.mem.mb` to 4096
```
mysql> select total_capacity,used_capacity from op_host_capacity where
capacity_type=0\G
*************************** 1. row ***************************
total_capacity: 4075905024
used_capacity: 6174015488
*************************** 2. row ***************************
total_capacity: 4075905024
used_capacity: 0
*************************** 3. row ***************************
total_capacity: 4075905024
used_capacity: 0
3 rows in set (0.00 sec)
mysql> select dom0_memory,ram from host where type="Routing" and removed is
null\G
*************************** 1. row ***************************
dom0_memory: 4294967296
ram: 4075905024
*************************** 2. row ***************************
dom0_memory: 4294967296
ram: 4075905024
*************************** 3. row ***************************
dom0_memory: 4294967296
ram: 4075905024
3 rows in set (0.00 sec)
```
Corresponding entry in `agent.properties`
`host.reserved.mem.mb=4096`
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