Comment 4 for bug 154864

Chris, if I recall, Ubuntu added a patch to GParted 0.4.3 to recognize /dev/mapper devices. This solves a portion of the problem of dealing with dmraid devices, but is not the whole solution.

For instance the /dev/mapper device entries would not be deleted when a partition was deleted, nor created when a new partition was created.

The current development version of GParted uses the "dmraid", "kpartx", and "dmsetup" commands to address these and other problems when working with /dev/mapper dmraid devices.

This new GParted software is available for testing at the above posted forum link.