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First off, I finished pre-clearing two 4TB drives using the Preclear plug-in. During that time, I heard a total of 6 siren sounds, lasting 6-8 seconds. The CPU, as I mentioned in my first post, was average loading between 30-50% with two drives. The OS (unRAID) was showing CPU temps in the low 30's C and motherboard temp in the mid 30"s. There are several options After reading PWM's posts in this thread and some searching on the Internet, I have come to the conclusion that the siren sound is likely a momentary high temp reading. So, I rebooted into MemTest86 and ran it in both default mode and CPU multi-thread mode. I was seeing CPU temps in the 45-50 C range for the default mode; and for the multi-thread mode the CPU was ranging between 52-59 C. I was out of thermal paste, so I ordered Gelid GC-Extreme because I could get it with free overnight pick-up. When I removed the Arctic Freezer 12 CPU cooler, while there was ok coverage, the cooler released very easily, which confirmed for me that there was too little thermal paste from my initial application. I cleaned the CPU and cooler. Then reapplied the paste and secured. The cooler felt tighter to the board/CPU than my initial installation. I rebooted into MemTest86, running in multi-thread mode, getting lower temps in the 45-51 C range. Additionally, during this process, I discovered I was losing time, so I replaced my CMOS battery (CR2032). Lost time issue is corrected. We'll see about the siren sounds. I'll update.

4 x 4GB 1333 ECC RDIMM. My Supermicro X8SIL-F has only four DIMM slots, but the 8GB was too expensive, so I settled on 4GB sticks. This seems more than adequate for now.

Thank you. I'll look at that.

I initially searched unRAID and didn't see anything. Then I posted here. Then I Googled the issue and found an unRAID forum post from 2011. I PM'd the OP. Hopefully there is a solution. Oh, yeah, I have the latest BIOS and IPMI.

Are you saying that I might be having a high temp or low RPM that is not being reported to unRAID, but the motherboard is alerting?

I have heard an audible alert of some kind, three separate instances. It sounds like a siren (nah, nuh, nah, nuh) and lasts between 6-8 seconds. I heard it twice yesterday, and once today. Supermicro X8SIL-F Xeon X3460 4 x 4 GB Nanya 1333 ECC RAM LSI 2911-8i HBA My server has been running for two days. I just finished my server and installed unRAID to a Sandisk Micro Cruzer. It booted fine. It's been running fine. I have been using the Preclear plug-in to manually preclear my five 4TB WD Reds. I started with just one. After it completed the initial read, I started the pre-clear on a second drive. Temps: CPU: 32 C Motherboard: 33 C HDD 1: 29 C HDD 2: 29 C HDD 3: 30 C HDD 4: 29 C HDD 5: 30 C No SMART drive errors. Average CPU load while preclearing two drives between 30%-50%. I ran MemTest prior to booting unRAID, with no issues. I looked at the motherboard manual but they talk about beeps during post. Thank in advance. Any help would be appreciated. Why am I hearing this kind of alert? Update 06.09.2018 9:00 pm: After reapplying thermal paste to my heat sink/CPU, I haven't had any "British" siren alerts. For now, it appears to be solved. Update 06.10.2018 2:20 pm: Not solved, I guess. 10 minutes ago I just got my first British siren audible alert since I reapplied thermal paste to my heatsink/CPU. At this point, I'm not sure. I have read that others in this forum have my same board (Supermicro X8SIL-F) enabled the jumper to silence audibles. But that doesn't seem ideal. Update 06.10.2018 3:11 pm: The alert went off again. I noticed that the fan speed displayed at that moment for fan header 1 was 78 RPM. This definitely looks like the culprit, causing the alarm. Update 06.14.2018 4:30 pm: Disabled the onboard speaker.

Your welcome! I was a little dismayed when I opened my PSU to find two SATA power cables. Getting these for $5 each takes the sting out.

I am currently working on my first unRAID home server build. My power supply is the Seasonic Focus Plus Series SSR-650FX 80+ Gold, which only comes with three SATA power cables for a total of eight drives. I searched Newegg and Amazon for more SATA power cables, without luck. Then I reached out to Seasonic support who directed me to Build To Order Servers, Inc. Build To Order Servers, Inc. offers Seasonic modular cables at fair prices. Each of their 6 pin to SATA cables is $5, as of this posting. So, I called them. I didn't get a messaging service, call center, etc. I got a real, live person who took the time to look up my specific PSU and directed me to exactly the location on their website of the cable options they have. Very helpful and not in a hurry to get me off the phone. Additionally, I have been using the Seasonic wattage calculator. It is similar to the Cooler Master calculator. There are a bunch of others. Some members may already be aware of this resource. It was helpful to me, so I'm sharing. I like how this calculator gives a Seasonic PSU recommendation. In my case, I maxed out the drives, etc. It gave me a load wattage of 283W and a recommended wattage of 333W. Then I doubled it because the efficiency curve for PSU's is at 50%.

Thanks for replies. I've done some Google searching on this topic also and found answers similar to what you kind folks posted here. Perhaps I was stuck, in part, by the fewer color options on Monoprice and Amazon, so got me wondering.

I'm curious, does an IT industry color standard exist for mini-sas cables? Because, they either seem to be a baby blue or red. Funny thing, when looking on Monoprice reviews, there were some complaints about the blue. For curiosity sake, I searched Amazon, finding mostly blue also, and some red.

I appreciate your input. It looks like the issue is whether the user client file system is set as HFS+ or APFS. APFS is automatic for Mac OS's updated to High Sierra on SSD drives. We haven't updated from Sierra to High Sierra, yet. So right now it looks like an AFS or SMB share in unRAID would still be the way to go. The Apple support page says, I believe, that while the client side requires no change in Time Machine, the server side requires SMB shares, not AFP, for Mac clients using APFS file system. It appears Apple is saying that they're moving away from AFP to SMB sharing. Am I reading this correctly? If there is a problem getting time machine to work, I wouldn't be opposed to another backup solution. I like that Time Machine takes care of versioning of data automatically for each user. Right now, my big thing is being sure that I can run the HPE server with unRAID. Then it's getting the system tweaked. My next priority is setting up a backup routine. Somewhere near the end of everything is being able to run OwnCloud. By the way, thanks for letting me know about the search function not working. Something seemed off with the searching via the forum; now I know why.

I've wanted a NAS to centralize backing up of three MacBook Pros. We have several 1 TB external USB drives which is grossly insufficient. I have considered a Synology box, though the prices seem quite high for the hardware. I've built several desktop PC's in the past before moving over to the Mac platform when Apple moved to Intel chips from Motorolla, so I decided to resurrect my rusty computer skills to get a NAS running. First I considered FreeNAS, then Openmediavault. I came upon unRaid by way of a discussion in the FreeNAS forum, I think. After looking at the unRAID site, I was pleasantly surprised and impressed. One thing that stands out is the vast amount of helpful getting started information, videos, etc., which is arranged in a logical, step-by-step, fashion. Honestly, the videos on the various topics really make this seem less like work and more like fun. So, here's what I'm looking at for an unRAID NAS build: Start with this motherboard and CPU: Supermicro X8SIL-F Xeon X3460 Build into this case: Fractal Design Node 804 Cube Case Add these components: Arctic Freezer 12 CPU Cooler Seasonic Focus Plus SSR-650FX Power Supply (I wanted a 550w, but this was cheaper) 4 x 4GB Nanya 1333 ECC Ram LSI SAS 9211-8i Sandisk Cruzer Fit 16 GB 2 - Samsung 860 EVO - 500 GB for redundant cache Add these data/parity drives: 5 - WD Red 4 TB NAS Drives (3 data; 2 parity) Replace stock 3 pin fans with PWM fans: 5 - Arctic 120mm PWM PST Fans 1 - Arctic 140mm PWM PST Fan Note: I had intended to add two additional 140mm fans above the MB to push heat up. Though, since the MB power connector is at the top of the board, the fans do not fit. Conclusion: This server will be used to: Backup MacBooks through Time Machine Backup DVD's Backup FLAC music files Run OwnCloud via Dockers Thanks in advance for looking at my proposed build. Any input would be appreciated - suggestions, questions, changes, etc. After I get this all set-up, I'll post pictures and detailed posts of my trials getting this server running. UPDATE: Initially I was going to transplant an HPE Proliant. Instead I went with the above Supermicro X8SIL-F. The system is built.

I am building my server now. I appreciate these videos, which will make the deployment of my hardware much easier. Thank you.

Cheers! Another fantastic video tutorial.

This video very clearly explained and demonstrated how the array and parity works for someone new. Good job. Thanks.