Again power failures, again nodes not responding to wake-on-LAN. Re-wired UPSs as follows :
| UPS1 | head node + switches + DAT tape |
| UPS2 | n0001 + n0005 |
| UPS3 | n0002 + n0006 |
| UPS4 | n0003 + n0007 |
| UPS5 | n0004 + n0008 (sitting behind the cluster) |
| UPS6 | n0009 (sitting to the left of i7) |
Following the re-wiring, the UPSs (at full load) stabilized at ~80%. We'll see how this goes. Took the opportunity to clear the head nodes' CMOS and re-gain the two 'lost' cores. To wrap this whole UPS story up, I should have bought 700 VA APC units two years ago and not this 'green-friendly' nonsense …