This is basically a fresh install. I installed XenServer from DVD to USB Flash Drive. I also have a freshly created Raid 1 volume (which is my intended target) and Dell disk backup drive.
xe sr-create content-type=user device-config:device=/dev/sda host-uuid=30b317b1-01bc-4eaa-9eb1-a43f16ebdbd8 name-label="SSDR1" shared=false type=ext
The SR operation cannot be performed because a device underlying the SR is in use by the host.
fdisk -l
Disk /dev/sda: 239.4 GB, 239444426752 bytes, 467664896 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
pvscan
PV /dev/sda VG XSLocalEXT-4958af2e-9aa2-3032-c814-5e5c6e8c1ffd lvm2 [222.99 GiB / 0 free]
PV /dev/sdc VG XSLocalEXT-4958af2e-9aa2-3032-c814-5e5c6e8c1ffd lvm2 [465.75 GiB / 242.76 GiB free]
Total: 2 [688.73 GiB] / in use: 2 [688.73 GiB] / in no VG: 0 [0 ]
UPDATE
Nuked host, rebuilt it from scratch and got around the problem. However I'm just interested in figuring out how to do the low level drive management from the CLI. I was able to get through it on my own by the seat of my pants. Just want some clarity.