[Help] Supermicro JBOD Board DOA?
Hi
Really hoping someone can point me in the right direction. So i've currently got a Supermicro SC847 case (36 bay, 24 front, 12 rear) running Freenas. I've just bought myself a Supermicro cse-ptjbod-cb2 or This... to replace the Mobo + Ram within the unit, and to run it as a JBOD Chassis directly connected to a server.
The advantage of the CB2 model over CB1 is the PWM fan headers. I've plugged the mobo into a PWM fan splitter, so I only need to use one header Like this
Which works spot on. However the board is outputting PWM at 100% constantly so the fans never spin down.
Connected are:
-ATX Style PSU Cable
-Chassis Ribbon cable for Power button etc.
-Supermicro black 5-pin (PSU?) connector
-Single fan for testing (Direct to the header)
The board works fine in that it responds to the Power, just the fans run flat out. Emailed the vendor I bought it from who couldn't help, and i'm still waiting back to hear from Supermicro. Do you think the unit may be DOA or have I missed something, the second I2C cable I believe is for SATA LEDs, but I'm not 100% as finding the manual for this thing seems impossible.
Any help very much appreciated
Posted Jan 16, 2018, 7:40 PM UTC
You may need a JBOD board with IPMI such as this one its more expensive but you get IPMI control of it and can set the fan speeds.
Thank you for the reply
Yeah I'd seen those units but they're 3x the price in the UK - also seemed a bit overkill. Still, That'll probably end up being my last resort, if i've not missed anything and this board just isn't capable....
You could try resister modding the fans themselves, but I wouldn't want to butcher them (personal opinion) because the stock Supermicro fans are expensive. You could attempt to replace the fans with Noctua's or similar that would be lower noise, but then the concern would be if you have enough CFM to move air through the harddrives and chassis to cool them or else you may cook your harddrives.
Yeah, I was looking at random PWM Controllers, picked a cheapy up and the cables are horrifically thin.. Wouldn't want to run on that full time for sure, looks like a fire waiting to happen.
I'm with you on modding the fans too, the fans are removable from a "holder" which has an extension cable from to the board... but I still dont like the idea of butchering those cables either (and the inherent risks around shorts, etc)