GitHub user RosiKyu added a comment to the discussion: Ubuntu 20.04 Template 
Problem

@rastopato, I did some further investigation and follow-up testing. 

### Test: Direct Clone from VMware Template in vCenter

I cloned the VMware template (created by Cloudstack on primary storage) 
directly in vCenter UI:

1. Selected the Cloudstack-created template (`26633039-a84a-4c7c-99a6-...`)
2. Cloned to Virtual Machine → selected VMFS datastore → Thin Provision
3. Powered on and watched console

**Result: EXT4 filesystem corruption errors during boot!**

<img width="1473" height="812" alt="image" 
src="https://github.com/user-attachments/assets/86080f43-d3dc-4ab3-8b2e-76440f4c827e";
 />

The VM eventually booted but filesystem shows corruption:

<img width="1499" height="812" alt="image" 
src="https://github.com/user-attachments/assets/64858d57-7141-4e26-9af5-248af2c69cdf";
 />

### Test: Cloudstack-Deployed VM Boot

Rebooted a Cloudstack-deployed VM (`i-2-5-VM`) from the same template and 
watched the console:

**Result: No EXT4 errors - clean boot!**

```
EXT4-fs (sda1): recovery complete
EXT4-fs (sda1): mounted filesystem with ordered data mode
```

<img width="1499" height="812" alt="image" 
src="https://github.com/user-attachments/assets/f07b2dca-c380-4e68-872b-00bed39aba0d";
 />

<img width="3070" height="1703" alt="image" 
src="https://github.com/user-attachments/assets/aec48976-3be8-44ef-93b9-ec79b408e05d";
 />


### Comparison

| VM | Clone Method | EXT4 Errors | Filesystem State |
|----|--------------|-------------|------------------|
| i-2-9-VM | Cloudstack API | None | Clean |
| test-direct-clone | vCenter UI Clone | Yes - CRC failures | clean with errors 
|

In my test environment, **Cloudstack-deployed VMs are NOT corrupted** on ACS 
4.21 + VMware 8.0.3. The corruption only occurs when cloning via vCenter UI.


I will try to reproduce with an upgrade path from ACS 4.20 -> 4.21 (since you 
mentioned it worked on 4.20.1 + VMware 8.0.0)

Since you're seeing corruption through Cloudstack but I'm not, the difference 
might be:
- **Management Server OS**: Your RHEL 9 vs my Oracle Linux 8
- **Upgrade vs Fresh Install**: You upgraded from 4.20.1, I have fresh 4.21

I will try to reproduce with:
1. RHEL 9 - based management server
2. Upgrade path from ACS 4.20 → 4.21 + VMware 8.0 → 8.0.3

GitHub link: 
https://github.com/apache/cloudstack/discussions/12610#discussioncomment-15744958

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