Citrix Xen 6 add new disk

First check the new added disk with command

fdisk -l

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 499 4008186 83 Linux
/dev/sda2 500 998 4008217+ 83 Linux
/dev/sda3 999 30401 236179597+ 83 Linux

Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table

So you see wee have one raw disk /dev/sdb.

Now you have to check the ID of the host:

xe host-list

uuid ( RO) : ba3d140c-3de5-499b-b831-7c40d82958a8
name-label ( RW): xen_test
name-description ( RO): Default install of XenServer

You have 3 options to create new disk in Citrix Xen
1. Create normal LVHD storage repository:

xe sr-create host-uuid=ba3d140c-3de5-499b-b831-7c40d82958a8
content-type=user type=lvm device-config:device=/dev/sdb
shared=false name-label="Local storage 2"

2.Create a LVHD storage repository with thin provisioning support.

xe sr-create host-uuid=ba3d140c-3de5-499b-b831-7c40d82958a8
content-type=user type=lvm device-config:device=/dev/sdb
shared=false name-label="Local storage 2" smconfig:allocation=thin

3.Create a EXT storage repository with thin provisioning support and direct access to

the vhd files.

xe sr-create host-uuid=ba3d140c-3de5-499b-b831-7c40d82958a8
content-type=user type=ext device-config:device=/dev/sdb
shared=false name-label="Local storage 2"

Remove Disk from XEN server 

Find the SR uuid of the disk:

xe sr-list name-label=<NAME OF DISK>

Find the PBD of the disk(search by UUID)

xe pbd-list sr-uuid=<SR UUID>

Unplug the disk by PBD

xe pbd-unplug uuid=<UUID of PBD>

Forget the disk:

sr-forget uuid=<UUID of SR>