P420i in Gen8 DL380p with no FBWC

[SD2016]

Hi there. We are setting up a Gen8 DL380p for Windows 2008R2 and resolved the P420i HBA/Raid mode. Now would like to maximise our flexibility with our assortment of HP SFF HDD drives. There are pairs of drives in different sizes from 146GB, 300GB up to 1TB so we can RAID 0 them in pairs, which will suit us. Without FBWC we have come up against some hardware limitations.

1. Without FBWC, is it a hardware limit to eastablish only 2 maxmium no. logical drives? Can this be extended in any way without using an FBWC?

2. Can we mix drives of different sizes into a RAID 0 to utilise the 8 drives we have in 4 different sizes (paired drives in 4 sizes)

3. We have 2 RAID 0 logical drives using 300GB and 1TB drives. Can the remaining unassigned (4) drives be HBA accessible via the Windows 2008 R2 OS ? (i.e. a hybrid RAID/HBA mix where the unassigned drives are visible to the OS)

Appreciate any response. Thanks.