(for Kajaani) plan your cluster's layout in the rack. Let us know about how many Us you'll use on phase 1 and how many you'll need for phase 2. This is important to optimize the cluster's distribution on Kajaani's machine room.
There's no need to buy racks for equipment that goes to Kajaani. If your machines don't go to Kajaani and you're considering reusing your own racks make sure you have sufficient PDUs.
Power cables: you should have at least 3 meter power cables on those devices which have cable arms installed and at least 2m cables for other.
Note: Kajaani's machine room have 6x C19 outlets and 42x C13 outlets on each PDU which makes total 12/96 power outlets per rack. Power cables must have C13 – C14 or C19 – C20 connectors. Let Dell know about this. They'll ship useless power cables if not stated otherwise.
Switches air flow should be checked with Dell considering if you want to place it in front or back side.
Note: Dell is providing ethernet switches with just 1 power supply. Kajaani has 2 power lines, one with and one without UPS. If this is an issue for your setup, ask Dell if they can offer other solutions.
Take in consideration the placement of the switches when deciding on cable lengths.
By principle, CSC keeps the customer systems' internal switches separated from CSC's general switched environment. iDRAC interfaces and ethernet interfaces for public access will be connected to a CSC switch that will be (in most cases) in a different rack. For those order 7 meter ethernet cables.
Make sure you order 1 SFP transceiver per compute node (One Dell Networking Transceiver, SFP, 1000BASE-T is included on each compute node [C6320] price).
Dell GPGPU node have some temperature operation restrictions - maximum intake air temperature of 25ºC in certain conditions (you can check Dell's server page). We are still trying to figure out if this can be an issue considering the environmental conditions of the machine room.4 GPU configurations should be avoided. Please see figure below.
Test unit configuration:
2x E52680 (120W, top column)+ 4x nVidia K80 (300W, side column) = 24 celcius