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I have devstack queens installed (+tacker,heat, networking-sfc, mistral) in an ubuntu16.04 VM (ubuntu18.04 host) (KVM, 4 vCPU, 10G RAM, 30G disk)

If I df the installation

df -h

Filesystem      Size  Used Avail Use% Mounted on

udev            4.8G     0  4.8G   0% /dev
tmpfs           980M   99M  881M  11% /run
/dev/sda1        32G   12G   20G  38% /
tmpfs           4.8G     0  4.8G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           4.8G     0  4.8G   0% /sys/fs/cgroup
cgmfs           100K     0  100K   0% /run/cgmanager/fs
tmpfs           980M     0  980M   0% /run/user/1001

so am using about 12G disk.

in terms of VMs here will only run 2 or 3 cirros VMs (i.e very light VM usage). Use the tiny or nano flavors.