I would put the RAID10/25K in its own pool.   The remaining members in one pool.    Monitor with SANHQ and depending on load you could later merge the 15K array with the others.   Also install the HIT kit as well.  
hi there, I am looking to add another EQL to my existing pool and was wondering what the best practise is. Am I right in thinking that I don't need to create a separate storage pool as the EQL is aware of the different characteristics of the drives and will move data according to is usage? Or should I create a separate storage pool and manually move LUNs? Cheers, A
best practise when adding another EQL