i am sorry i meant vertical. Even with vertical, just make sure component LUNs do not share raid groups. Unless you have an application that can move some serious data (backup application, huge datawareouse) , you may not see any difference in terms of performance (horizontal versus vertical).  Good paper to reference  [URL]
Hi,  We have a clariion cx-300i that was installed several years ago. (Flare 2.26.301.5.031)  Way back when the EMC engineer was first setting it up, he told us it was not a good idea (or maybe not possible, I dont remember which) to stripe raid sets across enclosures.  If this is true, does it apply to single-stripe (expanded) meta-LUNs? I presume it wouldn't matter for concatenated metaLUNs since the stripe for each component would stay on its own enclosure.  I need to create a fairly large metaLUN (750G to 1TB) and the only reasonble way to do it - without taking a whole shelf! - seems to be to create 3 components 275 to 330G (roughly) each... But if I do that, I'll have to use a concatenated metaLUN.  your thoughts are appreciated
MetaLUNs across shelves