Quotes from 1 presentation:
The I/O fencing provided by the SCSI-3 PGR feature operates only on
devices, not on partitions. For example, /dev/sda1 and /dev/sda2 are
partitions of the device /dev/sda. A fencing operation targeted to a raw
device bound to /dev/sda1 affects all partitions of /dev/sda, so any
file systems or other applications (including another Adaptive Server )
using partitions on that device are also affected. For this reason, the
device must be used exclusively by the cluster instance.

How can we compare this limitation with Oracle RAC?
I would think this limitation can be a big issue if we use Veritas
volume manger or Sun /dev/md volume manager.