January 20, 20242 yr I'm installing a EMC KTN-STL3 JBOD this weekend and have been looking for a solution to automatically power down the drive shelf when the server shuts down. The primary reason for this is that the server & JBOD will be on the UPS. The server will power down prior to the UPS being fully depleted, but the JBOD would continue spinning along. So, what I came up with as a plan is a solid-state relay (SSR), powered by a USB cable from the server into a outdoor rated electric box, controlling the SSR. A power cable & plug will also go into this box. Inside of the box, the hot wire from the power cable will connect to an SSR. The +5v & GND from the server USB will connect to the trigger posts on the SSR. The switched hot will come from the SSR and attach to a standard wall outlet. The GND & neutral from the power cord will also connect to the wall outlet. Add a cover plate, mount it in the rack, plug the 2 power cables from the drive shelf into the new outlet, plug the power cord from the outlet box into the UPS and lastly, plug the USB into the server. Basically, the disk shelf will now power on & off at the same time as the server. I may add an in-line switch on the USB cable to manually power down the shelf.
January 21, 20242 yr USB power not a good source to control SSR on/off, because it may on / off during server booting / initial. Current sensing (normal open) switch more suitable for this case, but you need found a device have enough switching capability. Pls also confirm does EMC KTN-STL3 will power on once AC input have power. Those switch no need external power, only need main wire pass-through it. !! Below are example only !!. https://a.co/d/8eiFl3s Edited January 21, 20242 yr by Vr2Io
January 21, 20242 yr Author What about something like this? https://www.amazon.com/Automatic-Etoolcity-Technology-Overload-Eliminating/dp/B07YK9VBQK/ref=asc_df_B07YK9VBQK/?tag=hyprod-20&linkCode=df0&hvadid=385124930314&hvpos=&hvnetw=g&hvrand=8408944786519487800&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9011240&hvtargid=pla-833075347902&psc=1&mcid=1a583a2b16e63511828047141b0c1af8&tag=&ref=&adgrpid=80210700684&hvpone=&hvptwo=&hvadid=385124930314&hvpos=&hvnetw=g&hvrand=8408944786519487800&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9011240&hvtargid=pla-833075347902&gclid=Cj0KCQiAnrOtBhDIARIsAFsSe53KznOSWypPEe7G19i5n_r2mN3r9jyKFQ8TvIfJsq2GxWO0wa9d-KEaAu0DEALw_wcB
January 21, 20242 yr These great, I think 1s delay on not a problem. Edited January 21, 20242 yr by Vr2Io
January 21, 20242 yr Author 2 minutes ago, Vr2Io said: These great, I think 1s delay on not a problem. There's a few options available for outlets like that. It's just the first one that I saw.
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