Linux dynamic volume

Just wondering. Is is posiblle to treat multiple partitions on multiple devices as one partition.
Exapmle: I would like to mount /dev/hda3 10G and /dev/hdb3 30G to the /home so that /home is 40G. Do not want to mount /dev/hda3 in some folder under the /home, want to have it in the same mount point. Somthing like windows dynamic volume, I think.

 

 

 

 

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