GitHub user shwstppr created a discussion: Physical size for QCOW2 volumes with backing file
When returning the physical size for a QCOW2 volume, which has a backing file (ROOT volumes especially), the size of the backing file is not considered. What I get in the UI, <img width="970" height="723" alt="Screenshot from 2026-03-02 21-21-15" src="https://github.com/user-attachments/assets/1e977f2e-8783-4e3b-90bb-2f39a5e1e8f8"; /> What I see in storage, ``` [root@ref-trl-11214-k-Mol9-rositsa-kyuchukova-kvm1 d20888cd-7e52-3481-b54f-80e14ff02320]# qemu-img info 3e33e73e-a71d-4022-8b80-680ea1d2adc2 image: 3e33e73e-a71d-4022-8b80-680ea1d2adc2 file format: qcow2 virtual size: 8 GiB (8589934592 bytes) disk size: 1.87 GiB cluster_size: 65536 backing file: /mnt/d20888cd-7e52-3481-b54f-80e14ff02320/f53fa557-1606-11f1-ac81-1e001a0002e1 backing file format: qcow2 Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false Child node '/file': filename: 3e33e73e-a71d-4022-8b80-680ea1d2adc2 protocol type: file file length: 1.87 GiB (2007171072 bytes) disk size: 1.87 GiB [root@ref-trl-11214-k-Mol9-rositsa-kyuchukova-kvm1 d20888cd-7e52-3481-b54f-80e14ff02320]# ll -h /mnt/d20888cd-7e52-3481-b54f-80e14ff02320/f53fa557-1606-11f1-ac81-1e001a0002e1 -rw-r--r--. 1 root root 1.7G Mar 2 08:44 /mnt/d20888cd-7e52-3481-b54f-80e14ff02320/f53fa557-1606-11f1-ac81-1e001a0002e1 [root@ref-trl-11214-k-Mol9-rositsa-kyuchukova-kvm1 d20888cd-7e52-3481-b54f-80e14ff02320]# ll -h 3e33e73e-a71d-4022-8b80-680ea1d2adc2 -rw-r--r--. 1 root root 1.9G Mar 2 15:51 3e33e73e-a71d-4022-8b80-680ea1d2adc2 [root@ref-trl-11214-k-Mol9-rositsa-kyuchukova-kvm1 d20888cd-7e52-3481-b54f-80e14ff02320]# pwd /mnt/d20888cd-7e52-3481-b54f-80e14ff02320 ``` While the template can be backing for multiple ROOT volumes, shouldn't the physical size of each volume also include the backing file size? In the above case, shouldn't it be 3.77G? This could create issues when sizes are retrieved by any external systems, and while checking for resource limits for backups, etc. GitHub link: https://github.com/apache/cloudstack/discussions/12734 ---- This is an automatically sent email for [email protected]. To unsubscribe, please send an email to: [email protected]
