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Posted to commits@cloudstack.apache.org by GitBox <gi...@apache.org> on 2022/04/05 11:22:17 UTC
[GitHub] [cloudstack] wido opened a new issue, #6205: Ceph storage pools report raw capacity: Allow capacity disable threshold per pool
wido opened a new issue, #6205:
URL: https://github.com/apache/cloudstack/issues/6205
##### ISSUE TYPE
* Feature Idea
##### COMPONENT NAME
~~~
Primary Storage
~~~
##### CLOUDSTACK VERSION
~~~
main
~~~
##### CONFIGURATION
- CloudStack with KVM
- Ceph (RBD) Primary Storage
##### OS / ENVIRONMENT
N/A
##### SUMMARY
CloudStack heavily relies on the storage pool support of Libvirt for reporting capacity and allocation.
Libvirt will report the raw capacity of a Ceph cluster, for example:
<pre>
root@hv-138-b15-27:~# virsh pool-info 27f662fa-6c7d-35fe-84d7-69b044600ffe
Name: 27f662fa-6c7d-35fe-84d7-69b044600ffe
UUID: 27f662fa-6c7d-35fe-84d7-69b044600ffe
State: running
Persistent: no
Autostart: no
Capacity: 1015.04 TiB
Allocation: 668.20 MiB
Available: 547.42 TiB
root@hv-138-b15-27:~#
</pre>
In this case the Ceph cluster is almost 1PB in RAW capacity and t his is being reported by Libvirt.
However, when 1TB of data is stored, due to the 3x replication configured inside Ceph we will use 3TB of RAW storage.
CloudStack makes a calculation based on the Volumes ALLOCATED on the Ceph cluster, so let's assume we have a couple of volumes on this pool:
- 10x 1TB
- 20x 2TB
- 100x 500GB
In total we have allocated (10x1TB)+(20x2TB)+(100x500GB) 100TB of storage.
However, because we replicate 3x, we will use 300TB of RAW capacity.
CloudStack now thinks that **10%** is in use, but in reality we use _30%_ of the cluster.
The disablethreshold of a storage pool can only be defined cluster-wide or zone-wide, but if you have a situation where you mix Ceph and NFS this does not work.
For example you want to set:
- Ceph: 30%
- NFS: 85%
##### IDEAS
I suggest two possible changes:
**storage.overprovisioning.factor**
This value is currently only allowed to be set >1. If we allow a value of 0.3 we can _underprovision_ the pool.
**pool.storage.allocated.capacity.disablethreshold**
We should allow this setting to be configured per storage pool.
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[GitHub] [cloudstack] rohityadavcloud commented on issue #6205: Ceph storage pools report raw capacity: Allow capacity disable threshold per pool
Posted by GitBox <gi...@apache.org>.
rohityadavcloud commented on issue #6205:
URL: https://github.com/apache/cloudstack/issues/6205#issuecomment-1171948792
Fixed in https://github.com/apache/cloudstack/pull/6218
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[GitHub] [cloudstack] rohityadavcloud closed issue #6205: Ceph storage pools report raw capacity: Allow capacity disable threshold per pool
Posted by GitBox <gi...@apache.org>.
rohityadavcloud closed issue #6205: Ceph storage pools report raw capacity: Allow capacity disable threshold per pool
URL: https://github.com/apache/cloudstack/issues/6205
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