Xen XVDA detection
2.6.32 kernels have different mode of naming Xen XVDA drives.
By adding xen_blkfront.sda_is_xvda=0 to kernel boot line in grub.conf you will make sure no naming translation is done, and the drives will be identified as xvde
By default, this option is set to 1 in the kernel, and drives are detected as xvda
This is needed only for CL6 and Hybrid kernels.