GitHub user RosiKyu added a comment to the discussion: Ubuntu 20.04 Template
Problem
@rastopato, I have re-tested with your template:
### Test Environment
- **CloudStack:** 4.21
- **ESXi:** 8.0.3 build-24022510
- **Primary Storage:** VMFS on iSCSI (LIO-ORG target, VMW_SATP_ALUA with SCSI
reservations)
### Template: Ubuntu2004.ova
- **SHA-512:**
`4552487d45487477f9d8b97a67c4fba2d745bd20f733c9162a7fb24876abc612ae725800cda04300ce48a137dce994e3ce16b13f0668cfda27122c9ba36e13fc`
```
(localcloud) 🐱 > list templates id=831221a1-5ab5-4591-ae8e-f06e9f05666e
templatefilter=all
{
"count": 1,
"template": [
{
"account": "admin",
"arch": "x86_64",
"bits": 0,
"checksum":
"4552487d45487477f9d8b97a67c4fba2d745bd20f733c9162a7fb24876abc612ae725800cda04300ce48a137dce994e3ce16b13f0668cfda27122c9ba36e13fc",
"childtemplates": [],
"created": "2026-02-09T19:26:35+0000",
"crossZones": false,
"deployasis": false,
"details": {
"rootDiskController": "pvscsi"
},
"directdownload": false,
"displaytext": "Reporter Ubuntu 20.04 template",
"domain": "ROOT",
"domainid": "47f1fcd3-027d-11f1-848e-1e00ef0003c4",
"domainpath": "/",
"downloaddetails": [
{
"datastore": "ref-trl-10863-v-Mol8-rositsa-kyuchukova-sec1",
"datastoreId": "118b6b6e-c668-4054-a81e-20bebd9daafa",
"datastoreRole": "Image",
"downloadPercent": "100",
"downloadState": "DOWNLOADED"
},
{
"datastore": "ref-trl-10863-v-Mol8-rositsa-kyuchukova-esxi-pri1",
"datastoreId": "d173e0a1-40db-3053-8caf-f20f437151cf",
"datastoreRole": "Primary",
"downloadPercent": "100",
"downloadState": "DOWNLOADED"
}
],
"forcks": false,
"format": "OVA",
"hasannotations": false,
"hypervisor": "VMware",
"id": "831221a1-5ab5-4591-ae8e-f06e9f05666e",
"isdynamicallyscalable": false,
"isextractable": false,
"isfeatured": false,
"ispublic": false,
"isready": true,
"name": "Ubuntu-20.04-reporter-template",
"ostypeid": "78242165-027d-11f1-848e-1e00ef0003c4",
"ostypename": "Ubuntu 20.04 LTS",
"passwordenabled": false,
"physicalsize": 1221115392,
"requireshvm": true,
"size": 21474836480,
"sshkeyenabled": false,
"status": "Download Complete",
"tags": [],
"templatetype": "USER",
"url": "http://10.0.35.49:8888/ubuntu2004.ova";,
"zoneid": "ece6ad13-731c-4dc9-a052-102c801e87e9",
"zonename": "ref-trl-10863-v-Mol8-rositsa-kyuchukova"
}
]
}
```
### VM Configuration (matching your setup)
- Boot type: UEFI Secure Boot
- Root disk controller: pvscsi
- OS: Ubuntu 20.04.6 LTS
### Results
**Filesystem: CLEAN - No corruption**
- **No EXT4 errors** in dmesg
- VM boots and runs normally
<img width="1512" height="812" alt="image"
src="https://github.com/user-attachments/assets/eae5b234-da34-46eb-ae34-484726f5d7c2";
/>
<img width="1512" height="812" alt="image"
src="https://github.com/user-attachments/assets/4bf89452-ab39-4377-b3da-d327d0494265";
/>
My test environment also uses iSCSI-backed VMFS with SCSI reservations (ALUA) -
architecturally similar to SAN storage. Both environments run Cloudstack 4.21
and ESXi 8.0.3
Despite similar env configuration, I cannot reproduce the corruption. I did
observe sporadic VMDK locking during some deployments, but these resolved
automatically - likely due to the retry mechanism in **PR #10586** (fixed in
4.20.1) which retries PowerOn operations when lock issues occur.
This points to something specific in your environment:
- **ESXi build/patch level** - What is your exact build number?
- **SAN vendor** - Different vendors may have different interactions with ESXi
8.0.3 ?
- **Storage drivers/VIBs** - Any third-party VIBs installed?
This appears to be a **VMware/SAN vendor-specific issue** rather than a
Cloudstack defect.
GitHub link:
https://github.com/apache/cloudstack/discussions/12610#discussioncomment-15757641
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