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Description of problem: libvirt running domain create snapshot take time over 7 mins Version-Release number of selected component (if applicable): libvirt-0.9.7-3.el7.x86_64 qemu-kvm-0.15.1-3.2.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. start a domain and login the guest system #virsh start rl62 2. # time virsh snapshot-create rl62 Domain snapshot 1331018776 created real 7m1.991s user 0m0.005s sys 0m0.004s 3. Actual results: over 7 mins Expected results: in the rhel6 it is less than 1 min Additional info:
This is the same problem as in bug 771626. You are executing a system checkpoint internal snapshot, which includes RAM state, requires a convergence algorithm, and which requires lots of disk space in the qcow2 file (which takes time, especially if the qcow2 file has to grow in size to hold that much state). But that is not a supported RHEL feature. You should really be using the --disk-only option when you create snapshots, as that is MUCH faster, and _is_ supported for RHEV. *** This bug has been marked as a duplicate of bug 771626 ***