The older SATA drives were single ported and thus you needed to ensure that all IOs to the disk came from one SP.  The newer SATAII disks in DAE3P/4P enclosures are dual ported and can be accessed by both SPs.  The limitation has been removed so you can stripe meta's from both SPs across the same RAID group now.  However, you should still be mindful of multi-threading IO to SATA disks and the overall impact of performance, because performance limitations have not changed. 
I think that I asked this before, but I can't find it in "search" and I don't remember the answer.  1.  Some years ago I was told that EVERY LUN that I created in EVERY RAID Group in a DAE, which contained SATA II drives, had to be owned by the SAME SP, because the SATA II drives didn't handle dual porting, or ownership-sharing well.   Then, with the advent of newer hardware (DAE3Ps or DAE4Ps or whatever), newer drives, and new FLARE, I was told that I could split ownership on LUNs on SATA II disks just like I could with FC drives; i.e. - even number LUNs owned by SPA and odd-numbered LUNs owned by SPB in every RAID Group in the DAE, or across DAEs.  Is that true?  2.  Can I make Striped MetaLUNs on SATA II drives, like I do on FC Drives?  i.e - I take 5 disks in a RAID Group on DAE 1_1, and 5 disks in a RAID Group on DAE 2_1 (in different DAEs and different busses), and make Striped MetaLUNs on the two RAID Groups, alternating even and odd LUNs between SPA and SPB?  Is there a performance advantage to doing so?      Stuart
SATA II LUN Ownership / Striped MetaLUNs