Restoring ufsdump archives on a virtual disk that is backed by a file on a UFS file system might cause the system to hang. In such a case, the ldmp2v prepare command will exit. You might encounter this problem when you manually restore ufsdump archives in preparation for the ldmp2v prepare -R /altroot command when the virtual disk is a file on a UFS file system. For compatibility with previously created ufsdump archives, you can still use the ldmp2v prepare command to restore ufsdump archives on virtual disks that are not backed by a file on a UFS file system. However, the use of ufsdump archives is not recommended.