Partitions not mounting

I have recently installed Debian Etch on a computer. It now boots, but the filesystems /usr, /opt, /home, /var and /tmp are not mounting, and when I attempt to mount them manually, mount complains that the file
/dev/mapper/vg1-<fsname> is missing. The /dev/mapper directory contains only
the file control. vg1 is the name of my volume group, and /usr, /var, /tmp,
/home and /opt were all set up (from the installer's partitioning step) to
be logical volumes. The root and boot filesystems and swap are md raid 1 devices comprised of identical partitions on my two hard drives. The sole LVM physical volume is a dm-crypted fourth md of another partition on the same two hard drives. Help is appreciated.

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