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![]() Convert VMDK disk to QCOW2 and place them in KVM default image directory (set propper permissions). Wrote small FAQ how to create GNS3VM with virt-install in libvirt, how knows maybe someone find this usefull :-):ġ. Actually I decreases resources but it was running stable 6 students workshop (2x vSRX, 1x Ubuntu-Desktop, 1x VPCs, 2 switches plus Cloud per lab). See attached PNG, these are settings for my GNS3VM running in Lab. Juniper suggests some optimalizations for nested KVM envinronment but those were already present. I was looking for staff that would speed up my vSRXes and using Virtio-BLK disks gave me the most. Other tuning must be perfomed on hypervisor OS level but as I reviewed GNS3VM all most obvious staff is already setup. vRAM 8-16G+ (depends on how much will be consumed by your VMs, balooning helps here a lot and is supported in Linux kernels by default, Windows need special drivers). vHDD disks Bus type: Virtio-BPK (I was experimenting with cache mode but it does not seem to influence performance much, I plan to investigate that later).Ĥ. vCPU type: host (on workstation use balooning as it saves RAM).Ģ. For QEMU/KVM enterprise clusters we are using Proxmox PVE which manages its VMs by itself without intermediate layer (just like GNS3-server does BTW).īut I think there some general rules the one must keep in order to gain maximum performance.ġ. I am using Linux/KVM in different favours A LOT these days.įor single hosted type of use I prefer QEMU/KVM managed by libvirt via Virt-manager/Virsh (I guess this is what people do in most cases). They could even add it to 2.2 :-) since doing that is really trivial and would take a hour or two to find all SDB dependencied in scripts they have. I think GNS3 guys will have to modify a couple of scripts (I was not looking for all places where SDB is sued) when they decide to support GNS3VM officially. This works as a charm and you have better performance too.
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