XenServer: Create RAID SR.
A quick How-To: on adding a RAID array as an SR in XenServer, the version I personally used was 5.6 but 5.5 and 5.0 should be identical.
Steps to create an SR in a Xenserver.
Locate the RAID array partition.
This returns a list of all partitions, find the RAID array and make note of it's name (sda, sdb, sdx, etc.).
Now locate the disk-id.
This lists disk ID's, look for the ID that matches the partition name from the previous step.
Obtain the XenServer host-uuid, we need this because we need to specify the XenServer as the host to attach the SR to in the next step.
Create the SR.
xe sr-create content-type=user device-config:device=/dev/<sdx> host-uuid=<host-uuid> name-label=”RAID Array” shared=false type=lvm
You should now be able to see (and use) your RAID array in XenCenter.