I would assume, please correct me if I'm wrong, that the snapshot format is based on the original template format. Thus, if your VM template was RAW all snapshots will be RAW. Is your template QCOW2 or RAW?
KInd regards, Ruben Bosch ________________________________ From: Marty Godsey <[email protected]> Sent: 05 November 2025 22:41 To: [email protected] <[email protected]> Subject: KVM, Snapshots, and QCOW2 Hello, On my KVM cluster, which is new and not in production yet since I am still tuning, I noticed that snapshots were taking a long time to complete. And when say a long time, I mean 45seconds to 1 min. The VM is, of course, paused when this happens. As you can imagine, this is unusable. The connection to the NFS storage is 100G and all NVME. While a snapshot is running, I can see it hitting the storage really hard. I then looked at the KVM process for that VM on the KVM server and it looks like it is using RAW for the format. I created this VM by spinning up a new VM in CloudStack so I could make my template. So I have a couple questions. How do I specify QCOW2 when making new volumes or spinning up new VMs and I assume that snapshots should not take this long, correct? Thank you for all your help.
