Stored in the `$graph/devicemapper/json` file (encoded as Json). Additional metadata required to mapįrom docker entities to the corresponding devicemapper volumes is The default loopback files used are `$graph/devicemapper/data` and By default these block devices are createdĪutomatically by using loopback mounts of automatically creates sparse Graph location (typically `/var/lib/docker/devicemapper`, $graph below)Ī thin pool is created based on two block devices, one for data and Module (dm-thinp) to implement CoW snapshots. The device mapper graphdriver uses the device mapper thin provisioning When the VM starts, it will automatically recognize the new drive, but the new storage must be manually added the virtual appliance.–storage-driver=devicemapper -storage-opt dm.basesize=20G snitm/docker/blob/master/daemon/graphdriver/devmapper/README.md # devicemapper - a storage backend based on Device Mapper
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