Hi Marty, Its about instance snapshots right, can try using 4.21/4.22 ( once its available) , apparently this is improved in 4.21 : https://docs.cloudstack.apache.org/en/latest/adminguide/virtual_machines.html#pause-during-live-instance-snapshots-on-kvm
-Jithin From: Marty Godsey <[email protected]> Date: Thursday, 6 November 2025 at 3:13 AM 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.
