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Brief Description
-----------------
Issue:
After deployment, created maximum numbers of VM's and then changed
cpu_allocation_ratio and ram_allocation value in nova.conf of both compute
nodes to achieve overcommit of CPU and RAM resources but Memory value doesn't
reach maximum value according to overcommitted value.
#Physical CPU and RAM on compute0
[root@Ctrl0 ~]# openstack host show Comp0
+-------+----------------------------------+-----+-----------+---------+
| Host | Project | CPU | Memory MB | Disk GB |
+-------+----------------------------------+-----+-----------+---------+
| Comp0 | (total) | 40 | 322094 | 54387 |
+-------+----------------------------------+-----+-----------+---------+
#Physical CPU on compute1
[root@Ctrl0 ~]# openstack host show Comp1
+-------+----------------------------------+-----+-----------+---------+
| Host | Project | CPU | Memory MB | Disk GB |
+-------+----------------------------------+-----+-----------+---------+
| Comp1 | (total) | 40 | 322099 | 54387 |
+-------+----------------------------------+-----+-----------+---------+
#Changed cpu_allocation_ratio and ram_allocation_ratio values in nova.conf of
both compute nodes
[root@Comp0 ~]# grep "cpu_allocation_ratio" /etc/kolla/nova-compute/nova.conf
cpu_allocation_ratio = 8.0
[root@Comp0 ~]# grep "ram_allocation_ratio" /etc/kolla/nova-compute/nova.conf
ram_allocation_ratio = 16.0
[root@Comp0 ~]#
[root@Comp1 ~]# grep "cpu_allocation_ratio" /etc/kolla/nova-compute/nova.conf
cpu_allocation_ratio = 8.0
[root@Comp1 ~]# grep "ram_allocation_ratio" /etc/kolla/nova-compute/nova.conf
ram_allocation_ratio = 16.0
[root@Comp1 ~]#
#Current vCPU and Memory consumption in system
Hostname Type VCPUs (used) VCPUs (total) RAM (used) RAM
(total) Local Storage (used) Local Storage (total) Instances
Comp0 QEMU 130 40
360.5GB 314.5GB 4.1TB
53.1TB 39
Comp1 QEMU 118 40
340.5GB 314.5GB 3.2TB
53.1TB 34
VCPU Usage
Used 248 of 80
Memory Usage
Used 701GB of 629.1GB
#After Creating multiple instance, we will be able to reach maximum vCPU
and RAM consumption to,
VCPU Usage
Used 312 of 80
Memory Usage
Used 813GB of 629.1GB
According to arch design mentioned in below link
https://docs.openstack.org/arch-design/design-compute/design-compute-overcommit.html
Overcommit of resources are not done for ram_allocation_ratio.. After 813GB
usage of RAM we are not able to make more instance of 8GB of RAM.
---------------------------------------------------------------------------------------------------------------------------------------------
#Physical Memory of Both nodes
[root@Comp0 ~]# free -g
total used free shared buff/cache available
Mem: 314 306 6 0 2 0
Swap: 31 31 0
[root@Comp1 ~]# free -g
total used free shared buff/cache available
Mem: 314 282 16 0 15 19
Swap: 31 23 8
[root@Comp1 ~]#
----------------------------------------------------------------------------------------------------------------------------------------------
#Schedular filters in the system
scheduler_weight_classes = nova.scheduler.weights.all_weighers
[filter_scheduler]
available_filters = nova.scheduler.filters.all_filters
enabled_filters =
AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter
----------------------------------------------------------------------------------------------------------------------------------------------
Kindly please share your valuable inputs regarding this overcommit ratio
settings in the system.
Also please correct us to achieve overcommit of vCPU and RAM resources.
** Affects: nova
Importance: Undecided
Status: New
--
Resource are not overcommitted when cpu_allocation_ratio and ram_allocation
_ratio value is set in nova.conf
https://bugs.launchpad.net/bugs/1955618
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