As far as i know,  there are not any 1TB FC drives.  those are only SATA right now.  So if you need alot of space for data storage, go with the 1TB SATA disks.   If you still need a lot of space but would like to get the better performance of FC,  you can get 600G FC drives.  if you went with the 600G FC drives,  you would need (6) 5 disk Raid 5 groups for a total usable space of 12.8TB.  You would need a minimum of (2) DAE's but that wouldnt leave you any space to get extra disks for hotspares.  If you have empty drive slots in other DAE's,  you can then just get extra disks and put them in those slots instead of buying another DAE just to have slots for the hot spares.
Hello,  Currently we have 4 DAE's with all the disks installed on CX3-10. We are upgrading it to CX4-240 and when we do this upgrade we are looking to add couple of DAE's so my exact question here is  We need to add 12TB of high capacity storage (1TB drives in 4+1 R5) and 2TB of high performance storage (450GB FC drives in R1/0).  Based on this how many number of disks we need and what is the number of disks and DAEs we need to add to fulfill the above requirements. Thank you for your time.
Question regarding DAE's