Cloning a gmirrored hard drive

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Hi!

My situation: I have a server with FBSD 7 installed with two 40 GB disks
in RAID 1 (gmirror) config.
Now I have noticed the lack of space on the drive so I am thinking to
change these disks for two 160 GB.
What is the best way to clone the main hard disk in raid 1 config? Is
this possible or is it better to switch back from RAID 1 to single disk
system and then do cloning with dump/restore (or dd) and then make RAID
1 again?

Regards,
Sasa
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