After killing myself for the last 24 hours troubleshooting 2 r815's I picked up, I have learned a thing or two.
If the cover is not on the box, it will not produce full power. Board will limit CPU power evident by power drawn at plug and performance in hash. I chased my tail for quite a bit yesterday and today until I figured it out. I got the servers Friday and only had enough memory on hand to get 2 cpu's running in one box. I saw appropriate hash numbers on it. Since I got 2 different speed CPUs for testings on the boxes, I tried the other set in dual mode and also saw the appropriate numbers. I then noticed the 50 memory sticks I ordered had arrived yesterday afternoon and rushed to get the boxes fully up and running. Since I had so many issues with memory population with the 1GB UDIMMS and even various 2GB RDIMMS I have, I had left the covers off and then could not figure out WhyTF in 4 cpu configs, I was down on power by 500H/s. They are also very picky about the memory that goes in them. Memory that works fine on other boxes comes up as failures on the r815s.
You must populate 16 DIMM slots. If they aren't all the same size, you will have an annoying F1 key to push everything the box boots, I have not found a way around that yet. The box will boot with 8 sticks but multiple threads will not have hwloc bind memory so performance will be garbage.
You will also get a slightly higher hash rate (100H/s or so) by disabling the gui and running from CLI only.
These things run great off 16GB usb flash drives.
le sigh...
If the cover is not on the box, it will not produce full power. Board will limit CPU power evident by power drawn at plug and performance in hash. I chased my tail for quite a bit yesterday and today until I figured it out. I got the servers Friday and only had enough memory on hand to get 2 cpu's running in one box. I saw appropriate hash numbers on it. Since I got 2 different speed CPUs for testings on the boxes, I tried the other set in dual mode and also saw the appropriate numbers. I then noticed the 50 memory sticks I ordered had arrived yesterday afternoon and rushed to get the boxes fully up and running. Since I had so many issues with memory population with the 1GB UDIMMS and even various 2GB RDIMMS I have, I had left the covers off and then could not figure out WhyTF in 4 cpu configs, I was down on power by 500H/s. They are also very picky about the memory that goes in them. Memory that works fine on other boxes comes up as failures on the r815s.
You must populate 16 DIMM slots. If they aren't all the same size, you will have an annoying F1 key to push everything the box boots, I have not found a way around that yet. The box will boot with 8 sticks but multiple threads will not have hwloc bind memory so performance will be garbage.
You will also get a slightly higher hash rate (100H/s or so) by disabling the gui and running from CLI only.
These things run great off 16GB usb flash drives.
le sigh...
Thanks for this as it has saved me some issues with the R815's I picked up.
By the way I read somewhere that these R815 servers only work with 2Rx8 ECC Registered memory. I picked up 25 sticks of 2GB 2Rx8 PCE-10600R memory and it worked without issues.
Question on running off 16GB usb flash drives. Do these wear out pretty fast and die? When I tried running off a flash drive for HiveOS the flash drives died in about a week because of the constant log writing that was going on.