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@@ -28,6 +28,45 @@ containers. All base images are snapshots of this device and those
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images are then in turn used as snapshots for other images and
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eventually containers.
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+### Information on `docker info`
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+
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+As of docker-1.4.1, `docker info` when using the `devicemapper` storage driver
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+will display something like:
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+
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+ $ sudo docker info
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+ [...]
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+ Storage Driver: devicemapper
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+ Pool Name: docker-253:1-17538953-pool
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+ Pool Blocksize: 65.54 kB
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+ Data file: /dev/loop4
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+ Metadata file: /dev/loop4
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+ Data Space Used: 2.536 GB
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+ Data Space Total: 107.4 GB
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+ Metadata Space Used: 7.93 MB
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+ Metadata Space Total: 2.147 GB
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+ Udev Sync Supported: true
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+ Data loop file: /home/docker/devicemapper/devicemapper/data
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+ Metadata loop file: /home/docker/devicemapper/devicemapper/metadata
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+ Library Version: 1.02.82-git (2013-10-04)
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+ [...]
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+
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+#### status items
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+
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+Each item in the indented section under `Storage Driver: devicemapper` are
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+status information about the driver.
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+ * `Pool Name` name of the devicemapper pool for this driver.
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+ * `Pool Blocksize` tells the blocksize the thin pool was initialized with. This only changes on creation.
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+ * `Data file` blockdevice file used for the devicemapper data
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+ * `Metadata file` blockdevice file used for the devicemapper metadata
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+ * `Data Space Used` tells how much of `Data file` is currently used
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+ * `Data Space Total` tells max size the `Data file`
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+ * `Metadata Space Used` tells how much of `Metadata file` is currently used
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+ * `Metadata Space Total` tells max size the `Metadata file`
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+ * `Udev Sync Supported` tells whether devicemapper is able to sync with Udev. Should be `true`.
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+ * `Data loop file` file attached to `Data file`, if loopback device is used
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+ * `Metadata loop file` file attached to `Metadata file`, if loopback device is used
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+ * `Library Version` from the libdevmapper used
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+
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### options
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The devicemapper backend supports some options that you can specify
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Vincent Batts