It isn't very pretty to do that (I like to have my documentation clean & pretty).  There isn't really anything wrong with it.  Some people like to stripe RAID Groups across multiple buses.  I'll do that with RAID-10 RAID Groups.  Sometimes,  if I have some free disks that aren't contiguous, I'll make a RAID-5 RG with them and migrate the LUNs off to another RG the next time I buy more disks.  I believe the CLARiiON best practices planning for performance guide specifically talks about this.  I was going to link it but Powerlink for is running super slow for me this morning.  I'll post once I can get to it, or if someone beats me to it.
Hi I have 10 hdd. I am going to create R5 4+1. On Bus 0 enclosure 3, i have 5 empty slots which is good. For Bus 1 enclosure 0, i have 4 empty slots and Bus 0 enclosure 0 i have 3 empty slots.  For the next RG of R5 4+1, can i put in the 4 disks on Bus 1 enc 0 and the 1 disk into Bus 0 enc 0.  Is this doable and is it Best Practice?   Thanks
no slots in DAE