How to power off USP-V when it doesn’t want to

In the era of VSP G1000 this post may sound dated but I still hope that it would help some poor sole in the same situation I was sometime ago. The task was laughably simple: power off USP-V, power it up just to make sure it still could boot up flawlessly and shut it down again. All went nice and dandy till the final step – the ultimate power off. So I opened DKC panel and switched simultaneously two switches: PS-ENABLE and PS-OFF (all in accordance with the maintenance manual).

So far so good. During the first power off iteration it took the array (DKC and one DKU) roughly 15-20 minutes to cut off the power from its components so switches on AC boxes could be turned into OFF position. But not this time… After waiting for one hour and a half the system was still up. However, and thankfully the disks had been spun down successfully. That opened a door for a forceable shut down procedure. Which is simple and straightforward as a samurai’s sword.

Open DKC panel and unscrew it as shown on the picture below.

Pay attention to the jumpers. We will be using JP3 which is right above JP2.

If you don’t have a jumper (I didn’t have one) there is also a workaround. Go to the back of a DKU, open its door and at the bottom there is a recess with another set of jumpers.

It is save to pick and pull out any of these jumpers (remember that the disks had to be powered off before that).
I’ve been told that these jumpers define the physical position of a DKU rack relatively to a DKC (is it on the left or right and how far DKU-R1, DKU-L1, etc.)
Once you have a jumper put it into JP3 in the DKC panel and turn CHK RST switch on but pressing on its upper half.
A moment after that the array would be shut down.