Xenserver – add secondary hard drive

It looks like you'd need to create the VDI from the command line using the 'xe vdi-create' command and then run 'xe vdi-introduce' with the 'sharable' parameter set to 'yes'. Example commands below.

xe vdi-create sr-uuid=469353c2-eb18-7ffe-c754-bc3cce211c07 name-label=myvdi type=user virtual-size=100GiB

xe vdi-introduce uuid=cfac1a2d-ac9f-44f3-a621-2e257875bb5d sr-uuid=0ff1387a-739a-36df-31df-1ccc70f229bc type=user location=cfac1a2d-ac9f-44f3-a621-2e257875bb5d sharable=yes

Page 175 for more - http://docs.vmd.citrix.com/XenServer/5.5.0/1.0/en_gb/reference.html

Shutdown the guest using something like

xm shutdown <guest>

Check so it is shutdown

xm top

That path hints that it's not an LVM, but a physical disk. This is a job for libguestfs. Make sure you have it installed. First you check what filesystems you have in that block device:

virt-filesystems -a /dev/sdb1

Then you mount the root filesystem:

guestmount -a /dev/sdb1 -m /dev/<whateverhappenstoberoot> --rw /mnt

Change root directory:

chroot /mnt/

Update your passwords

passwd root

And then you restore everything

logout
unmount /mnt/
xm create /etc/xen/vm/<guest>