Understanding Memory CPU values with helm and OPensearch dashbaord

OpenSearch
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):

2.14.0

Describe the issue:

Am not able to understand configuration mentioned in helm chart and result when i get from DEvtools Get api query in opensearch dashbaord. AM pretty new to ECK and Opensearch. Please help me

Configuration:
As per helm chart , Hot node configuration is
replicas: 3
pdb:
enable: true
minAvailable: 2
diskSize: “750Gi”
jvm: -Xmx5200M -Xms5200M
nodeSelector:
resources:
requests:
memory: “8Gi”
cpu: 4
limits:
memory: “8Gi”
cpu: 4

===WHen in Devtools using GET _cat/allocation?v&s=disk.percent query ======

shards disk.indices disk.used disk.avail disk.total disk.percent node
40 156.9gb 156.9gb 530.9gb 687.9gb 22 opensearch-cluster-data-cold-2
40 156.1gb 156.2gb 531.7gb 687.9gb 22 opensearch-cluster-data-cold-1
40 156.8gb 156.8gb 531gb 687.9gb 22 opensearch-cluster-data-cold-0
40 158.9gb 159gb 528.9gb 687.9gb 23 opensearch-cluster-data-warm-0
40 159.3gb 159.3gb 528.5gb 687.9gb 23 opensearch-cluster-data-warm-1
40 159.1gb 159.2gb 528.7gb 687.9gb 23 opensearch-cluster-data-warm-2
40 189.3gb 191.3gb 546.3gb 737.6gb 25 opensearch-cluster-hot-data-1
40 152.4gb 223.1gb 514.5gb 737.6gb 30 opensearch-cluster-hot-data-2
41 227.9gb 230.5gb 507.1gb 737.6gb 31 opensearch-cluster-hot-data-0

Can explain me how this is matching.
Relevant Logs or Screenshots:

2

@Deepa What is the exact question? Which part do you need an explanation for?

3

as per helm chart its shown as
memory: “8Gi”
cpu: 4

but as per GET API query it gives as

shards disk.indices disk.used disk.avail disk.total disk.percent node
40 189.3gb 191.3gb 546.3gb 737.6gb 25 opensearch-cluster-hot-data-1
40 152.4gb 223.1gb 514.5gb 737.6gb 30 opensearch-cluster-hot-data-2
41 227.9gb 230.5gb 507.1gb 737.6gb 31 opensearch-cluster-hot-data-0

So where is this memory of 8Gi being shown here , or is ther any unit convertion?
Also which API query i can see for CPU value as 4 mentioned in helm chart

4

Hi,

memory GB is not the same as disk GB, this is a fundamental difference.

Here you can find metrics on memory, Nodes stats - OpenSearch Documentation

What is the difference between memory and disk storage? (iu.edu)

Best Regards
Sebastian

5

@Deepa This section in values.yml refers to CPU cores and RAM.

resources:
  requests:
    cpu: "1000m"
    memory: "100Mi"

Storage is defined as persistent volume in the persistence section of the values.yml file.

  size: 8Gi