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Dell R720 Can't boot to Unraid -- Failed to allocate memory

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I've been stuck on this error for 3 nights now, ESXi and FreeNAS both boot fine under the same thumb drive, server and options. As well as Parted Magic, so I don't think there's anything going on with that. The error that's coming up is the same as this thread: 


Hardware configuration:

  • Dell R720xd (24x 2.5" in the front, 2x 2.5" in the rear)
  • 2x Xeon E5-2680v2
  • 128GB DDR3 ECC Registered RAM (MT36KSF1G72PZ-1G6K1LG)
  • MD1200 enclosure
  • Pulled the PERC out entirely
  • Recabled the backplanes to the 9207-8i
  • LSI SAS 9207-8i for the 26x 2.5" drives 
  • LSI SAS9207-8e for the MD1200 
  • All drives recognized by Parted Magic and validated good/healthy


Things I've tried:

  • Installing a GPU (not a good one, but something)
  • Different thumb drives
  • Different Unraid versions
  • Used both the USB creator and the manual method
  • BIOS and UEFI Boot modes  (can only get it to this point in UEFI)
  • I just threw in a NIC and moved the cable I'm using from the integrated daughter card to that -- no change. NIC removed and we're plugged back into the daughter card.
  • Removing all but two RAM DIMMS (1 for each CPU) -- Currently booting with this config
  • Swapping those single remaining with another to validate the RAM
  • Currently trying a different server alltogether, same hardware config (moved over the HBAs) No change, same error. Something going on with the config of these boxes or this image provided by UnRAID.
  • Tried a different RAM (Samsung DDR3) and no change. I'm completely at a loss.
  • Ran Memtest86+ against the 8GB in there, no errors.
  • Tried the front USB port and a different thumb drive. Made it to the same point and same error. Will try different thumb drives and the rear ports.
  • Tried other thumb drives in the rear ports -- one doesn't like to boot with this server so I tried the other that does boot in both rear ports. No change. Still erroring
  • For kicks, disabled the PCI-E ports in the BIOS (can't get to the server right now) to remove the LSI HBAs from the system -- no change.


Next to try:

  • I'm out of ideas :(



I don't think it's going to be RAM related, as ESXi and FreeNAS haven't had an issue booting to this server. I REALLY don't want to use FreeNAS, and having massive datastores carved out in ESXi isn't really what I had intended for this project, either. I'd like to jump into the Unraid ecosystem if at all possible.


If anyone has any ideas, I'm all ears! I'm gonna keep poking in the meantime.



Edited by Dovi

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I don't think you mentioned actually doing memtest. You did talk about swapping memory, but it's possible a memtest would detect something such as a bad slot.

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It would have to be one of the slot 1 (A and B) of the chassis, I removed all but two DIMMs and even swapped the brand/speed/size. I'll get that run on the 8GB in there in a little bit and get back to you here shortly.

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1 minute ago, trurl said:

Also, have you tried a different USB port to boot from?

It's the internal one, I'll try the others with the same thumb drive and get back on that.

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6 hours ago, trurl said:

Also, have you tried a different USB port to boot from?



No errors after over 6hrs. Will try different USB ports when this is done.

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I've been updating the main post with what I've tried and my next ideas. Tried all the USB drive shenanigans/shuffling and no change from the same error/point it halts before.


Thanks for the suggestions, seems like this is a persistent one. Any other ideas?

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