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Create an image with multiple disks mounted

I am trying to create a custom CentoOS image for Openstack. This wiki has been helpful in creating one successfully:

But, I want to build an image with more than just disk e.g. /dev/sda containing the root file system and say another /dev/sdb mounted on /mnt. If I convert it to an Openstack image and boot it, will I get two disks on Openstack? When I tried it, the instance failed to boot, the init sequence failed when trying to run fsck on the second disk.

Also is it required to mount the root file system on /dev/vda? Can it have a partition table?