While not always the case, sometimes these issues have to do with physical block sizes on the underlying disks or logical arrays, for example native 4k sector sized drives, etc. I've been able to get around these issues before using three different strategies:
1) The first option is to use ZFS to create a new logical volume on-top of the existing logical drive, and then create ext4 partitions on top of the ZFS volumes. ZFS plays nicer with the underlying arrays and ext4. To do this, you would boot from the CD, install and configure ZFS, setup new ext4 partitions, and then reboot and re-install the OS ontop of the existing ext4 partitions.
2) Another possibility, is within your hardware RAID controller, try re-creating your logical drive using 512 byte sector sizes (if that's an option), and then try reinstalling. It's possible (but unlikely) this would then just "work" and you could install your OS from your boot disk as usual.
3) A more hacky solution which isn't ideal for a variety of reasons but could get your space, would be to split up the underlying logical array into several 600GB logical RAID-0 arrays, and then use software raid under Linux to make those appear as one large volume. This would take a bit more work to do.