OK - look at page 63 in the manual.  The first DAE that's connected to the DPE, you used cables from the DPE to the first DAE using the "A" port on the DAE - this is the "IN" port on the DAE. Port "B" is the "OUT" port to the next DAE in the chain to that DEA's "A" ports.  You have two Backend (BE0 and BE1) SAS buses on the DPE, so balance the number of DEA's on the buses. BE0 connects to the DPE disks, so use BE1 to connect to the first DAE, then BE0 to the second DAE, then BE1 to the third DAE.  Then you have two DAE's (one is the DPE) on BE0 and two on BE1.  The order does not matter, but if you only have 1 meter cables you might have problems if you connected all the BE0 DAE's first, then tried to cable the BE1 bus to the fourth DAE - the 1 meter cable might not reach.  It's B (out) to A (in).  glen
We have a Unity 500 Hybrid with a mixture of 2,5" and 3.5" disks and related DAE's. My question, does the order of the DAE's make a difference when racking and cabling or is this a "moot point" these days (3 x 2.5" DAE's and 3 x 3.5" DAE's)?  Thanks
Installing U500 Hybrid