Hello!
I am the reddit person with said failed switch. I have just registered to reply here.
Original post:
I assume you are right on every account. They HAVE been tampered with.
I linked the power meter very closely resembling the one I have, as I couldn't find the my Poland/Germany only model on US Amazon. I also have DIN rail mounted current meter.
After reading the replies out there and looking into all the photos and other threads I could find of the switch and its insides, I came to conclusion, that I either "scored" engineering sample or qualification sample or got a result of some not-exactly-professional-but-still-somewhat-competent person frankensteining this device from scrapped or stolen lot.
It can be either, since it's impossible to modify fan curve, and knowing devices like that usually turn into "survival mode" (fan speed to max) when some sensors are off, it behaved surprisingly well, suggesting either someone found a way to alter it, to fool the sensors or it came with pre-release fw or client-targeted one.
I should have opened it right after receiving, but I only did coursory look to see of there are no loose components or screws, threw cables in and it worked, so I left it as it is. Only thing I did was swap the PSUs around. Switch and extra PSU were bought from same place (an eBay auction, and it was private person as far as I remember).
Using this photo:
as reference, I found:
- switch has no serial number, neither on the device itself or on the motherboard, and all stickers were removed. Can't say anything about the firmware now, but you saw the zeros. Only markings I could find are laser etched "AR2054-01-011" between CPU and stack connector card and "Brocade MV1194V-0 / AB 1 026-3" under the card;
- memory stick was kaptoned to the slot from all sides and all over, and I have Smart sg57a648bro535y1sj EP2-5300c-555-13-zz. This is the only thing that has intact serial number in whole device, but I didn't find anything about this particular stick.
- all PSUs had a sticker with revision saying S5, where there would be A, B or C originally, underneath it the original rev has been scratched off. Stickers with QR and s/n are missing. They all bear marks of being opened multiple times (a lot of scratches around the screws and tabs were clearly abused). I missed this since for some time I used to handle device scrapping at my workplace so I got resistant to noticing scratches.
- I went over the motherboard with good light and found solder flux residue around almost all power components;
- almost all of electrolytic capacitors are random brands;
- Boot flash chip has "fused!" handwritten with a marker pen and flux residue around its legs;
This probably explains the bricking and null s/n.
- Battery socket, after removing the battery shows signs of cleaned up corrosion (I don't ever recall seeing Lithium battery leak!); Current battery reads 2.9 V.
- headers J2, J10 and U6 had been clearly removed;
- place where POE headers go in PoE-equipped models were clearly soldered on and cleaned up;
- One of the fan tray connectors on the board had mangled pins and its mounting screw was held in place by copious amount of Locktite or similar glue. I had to wrestle it off. Fan modules look okay. There is a trace of s/n stickers being removed from them on the inside between the fans.
One thing that stands to me now, is that I never noticed the switch kicking up the fans to speeds anywhere close those heard during boot sequence, they did went up but not much - but at the same time it really did pull that much power off the wall. On idle the exhaust was moderately warm to very warm, but I wouldn't describe it as hot, like for example Dell R640 going full tilt can get, and with max traffic I could put on it it got really, really hot, enough to make keeping hand in the airstream very uncomfortable to painful.
I should also note that I misread the specifications! I assumed that both PSUs work in unison and share power, and to boot it only from one I need higher tier, 750 ow 1000 W ones. I am used to moving around 2 kW+ switches at work, so this is really why I paid no mind to inability of my device to turn on with one and the power consumption.
With all of that, and switch now bricked, even if I managed to find someone actually competent who would repair it I don't exactly feel safe putting it back into my homelab, little late perhaps, but oh well.
If anything I consider this to be a warning not to blindly trust enterprise gear. It never dawned on me someone would just go over a device like this to fix it. It's not that big blow financially, these switches go under $100 routinely, and I have other 10G gear, 40G was very cool addition, but I can live without it.