A defaults charm deployment just does that - it uses the defaults.
So librbd should have safe writethrough caching enabled (balance of perf
vs consistency)
And libvirt sets:
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='nova-compute'>
<secret type='ceph' uuid='514c9fca-8cbe-11e2-9c52-3bc8c7819472'/>
</auth>
<source protocol='rbd'
name='nova/6c26f1de-8fa8-40f1-aa4d-d3e6206b26d4_disk'>
<host name='10.5.0.4' port='6789'/>
<host name='10.5.0.20' port='6789'/>
<host name='10.5.0.28' port='6789'/>
</source>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</disk>
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https://bugs.launchpad.net/bugs/1773449
Title:
VMs do not survive host reboot
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