I see the below message when I run
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use
--storage-opt dm.thinpooldev to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
I’ve been looking around trying to find what exactly the issues caused by using loopback devices in production are and I can’t find a thing. Just lots of people saying don’t do it.
Can anybody enlighten me to what the actual consequences of this are?