change passphrase

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I have a raid-1 system running btrfs on top of luks.

I cannot remember my passphrase, but the system is running and I have
made a backup.

I'd like to add a new passphrase, and have followed the instructions
from 6.10 at
http://code.google.com/p/cryptsetup/wiki/FrequentlyAskedQuestions#6._Backup_and_Data_Recovery

This worked for the first device, which seems to work with /dev/dm-0,
but I cannot work out what the device name for the second raid-1 member
is. The btrfs partition is on top of the luks device, and so I need to
change both.

The example shows:
  dmsetup table --target crypt --showkey /dev/mapper/c5

How do I know what to put in place of "/dev/mapper/c5"?

Many thanks.

-- 
  Biltong
  biltong@xxxxxxxxxxx

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