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Forum Discussion
ReadyNAS 316 negotiating 2 ports SAS 1.5g
Hey guys, I could use some help diagnosing this issue I'm seeing with my 316. I got this unit off of eBay about a week ago and I've got it all setup and updated to the latest firmware. I noticed th...
Yes, but my point was that my drives are not reporting the connected speed, just their capability, so I don't know if they are connecting at 3G or not unless they only report the connected speed when it doesn't match the max capability (they are older Hitachi drives that are only SATAII).
Your handshake description is pretty much right on, but I would say " if the disk doesn't get a response it understands, then it shifts down", so noise can play a part in a bad handshake by clobbering the messages in either direction. Bad cables are a typical source of noise, so a bad or dirty connector could be as well. But that kind of noise will typically also cause other errors such as ATA errors.
I have one RN516 (which uses the same SATA backplane as the 316) for parts and already sold the backplane because another owner had an even worse issue -- a couple drives not being recognized at all. That did fix it, so there could be something wrong with the backplane itself. But his was physically damaged when the NAS took a fall with drives in it.
I tried booting the array with one disk with nothing on it and then moving the disk around. The negotiation issue stays with the individual slots. The same drive will negotiate at 3G in all but the 2 slots I've been having issues with. Some drives I put into the system power up and the blue LED on the right hand side lights up but the system doesn't recognize them. Other drives negotiate at 1.5G instead of 3G. I think this is pointing to a hardware issue with the SATA connector on the board or possibly a sketchy capacitor or something like that? I popped open the chassis and looked at everything and it all looks good. I didn't try to disassembly anything and dig deeper but it looks like there are 2 different PCIe connectors that the backplane plugs into. So no way to easily break these out.
I think I'll try to open a case with Netgear just in case the warrany is somehow still good but I'd be willing to bet it is long expired.
If anyone has any additional sugestions or things to check I'd be happy to look into this more. Thanks for the help so far.
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