On the topic of beefy virtual guests, Red Hat has also grown the amount of memory that can be allocated to virtual guests. In RHEL 6.3, memory per virtual guest has moved from 512 GB in previous releases up to 2 TB. Red Hat Enterprise Linux 6.3Virtual disks have also been scaled up in the SCSI subsystem from 25 disks per guest up to thousands per guest.
From an availability perspective, Red Hat is introducing Dynamic CPU Hotplug, technology that allows a virtual guest to add more virtual CPUs while it is still running.