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change harddisk AES encryption mode on server with raid1

I've got a server running ubuntu 12.04 LTS with encrypted root in a raid1. Due to the vulnerability of 256-bit AES in CBC mode on LUKS encrypted partitions I'd like to change the encryption mode of ...
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Restoring data from a failed and possibly partly overwritten mdadm raid1

I have a failing hard disk (let's call it sda) which contains, among other things, a 1.5 TB partition (let's call it sda3). There is another disk (sdb), which has a 1.5 TB partition (sdb1) as well. ...