kiranchavala opened a new issue, #13718:
URL: https://github.com/apache/cloudstack/issues/13718
### problem
Incorrect Disk usage is reported when a Ceph storage
### versions
ACS 4.22.1
ceph version
ceph version 20.2.2 (0fcffee29411e3a38036764817b6e1afc59741cc) tentacle
(stable - RelWithDebInfo)
### The steps to reproduce the bug
CloudStack added support for ceph erasure code pool in the 4.21 release
github.com/apache/cloudstack/pull/9808
Steps to reproduce the issue
1. Create a ceph-storage with Erasure code setting
```
ceph osd erasure-code-profile set cloudstack-ec k=2 m=1
crush-failure-domain=host
ceph osd pool create cloudstack-ec 64 erasure cloudstack-ec
ceph osd pool set cloudstack-ec allow_ec_overwrites true
ceph osd pool application enable cloudstack-ec rbd
ceph osd pool create cloudstack-ec-metadata 32 replicated
ceph osd pool set cloudstack-ec-metadata size 3
rbd pool init cloudstack-ec-metadata
```
2. Add the storage pool in cloudstack
```
createStoragePool scope=zone zoneid=<ZONE_ID> hypervisor=KVM \
name=MyCephECCluster provider=DefaultPrimary \
url=rbd://cloudstack:<RADOS_SECRET>@192.168.55.11/cloudstack-ec-metadata \
details[0].key=dataPool details[0].value=cloudstack-ec \
tags=RBD-EC
```
3. Check the disk usage from ceph side
```
root@ceph1:/home/ubuntu# ceph df
--- RAW STORAGE ---
CLASS SIZE AVAIL USED RAW USED %RAW USED
hdd 150 GiB 150 GiB 200 MiB 200 MiB 0.13
TOTAL 150 GiB 150 GiB 200 MiB 200 MiB 0.13
--- POOLS ---
POOL ID PGS STORED OBJECTS USED %USED MAX AVAIL
cloudstack-ec 3 64 8 KiB 1 12 KiB 0 95 GiB
cloudstack-ec-metadata 4 32 7.9 KiB 3 36 KiB 0 47 GiB
```
4. Check the Disk used size from Cloudstack
<img width="1565" height="713" alt="Image"
src="https://github.com/user-attachments/assets/34bd3e90-7603-45d9-a968-6bc37bd59d7b";
/>
5. Deploy a data disk of size lets say 5gb on the ceph storage pool
6. Attach it to a running vm
7. Populate some data on the data disk
dd if=/dev/urandom of=/dev/vdb bs=1M count=2048 status=progress oflag=direct
8. Check the ceph disk usage
```
root@ceph1:/home/ubuntu# ceph df
--- RAW STORAGE ---
CLASS SIZE AVAIL USED RAW USED %RAW USED
hdd 150 GiB 147 GiB 3.2 GiB 3.2 GiB 2.13
TOTAL 150 GiB 147 GiB 3.2 GiB 3.2 GiB 2.13
--- POOLS ---
POOL ID PGS STORED OBJECTS USED %USED MAX AVAIL
.mgr 1 1 577 KiB 2 1.7 MiB 0 46 GiB
cloudstack 2 64 6.8 KiB 3 32 KiB 0 46 GiB
cloudstack-ec 3 64 2.0 GiB 513 3.0 GiB 2.11 93 GiB
cloudstack-ec-metadata 4 32 9.1 KiB 6 62 KiB 0 46 GiB
```
9. Check the cloudstack storage used
<img width="1478" height="760" alt="Image"
src="https://github.com/user-attachments/assets/5ac70e19-745f-4567-923b-4ff48c627300";
/>
Cloudstack is reporting the used size from the replicated metadata pool and
not the actual erasure code pool
### What to do about it?
CloudStack should report the correct disk size used from the erasure -code
pool and not the replicated metadata stats
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