# ssh into the box as root (or use the console)
# list all the disks by id
ll /dev/disk/by-id/
# find your device, for example:
# lrwxrwxrwx 1 root root 9 Oct 2 02:24 ata-SanDisk_SSD_PLUS_1000GB_19244L449713 -> ../../sdb
# my SanDisk SSD is on /dev/sdb
# find your host's uuid
xe host-list
# create the new drive
xe sr-create content-type=user device-config:device=/dev/sdb host-uuid=abcd-efg-123-555-asdfasdf name-label="sandisk-1tb-ssd" shared=false type=lvm
# go to scp-ng center and look under the server and the new drive should show up.
# find it, click on Storage, click Add, and create a new virtual disk using that drive.