Belgian Genius

Thanks.

Nope.

Thanks. What a nightmare. If only I had known that UnRaid was storing stuff on USB flash, I would have kept backups! Assuming I can get it booting with a new Flash USB, how do I set up my disk array? 5 Data disks (3x12GB, 2X10GB for 44GB usable space) One of the 12GB disks is parity and I can likely guess which it is, but I won't be certain. There is also a 256GB SSD cache disk.

No, I just reflashed it with a clean image. The data is all saved on my hard drives, right? I realized after I screwed myself by wiping the flash drive, but I never realized UnRaid saved anything to the flash drive. First things first - why would is suddenly stop booting and why would the computer end up at the bios screen after the flash drives flashes for two minutes?

I was running the latest version of 6.9.2. I logged into unraid today and got a message that the USB drive had "dropped off" and could be corrupt. Rebooted and no dice. Reformatted the drive on my windows PC and reinstalled UNRAID. USB key seems perfectly fine with no errors on format. But, when I put it into my NAS computer, the computer seems to recognize it and try to boot off of it (key is flashing like normal), but the screen is blank the whole time and nothing happens. Sometimes the computer just jumps into the bios after a few minutes. Any idea what the heck is going on here?

Well, I owe you a big thank you for this one! The Thecus N5550 I had my disks in was at least 8 years old, so I decided to chuck it. I have lots of parts laying around, so I constructed a server based on: Asus X99 motherboard Xeon e5-1620 CPU 16 GB Ram ...and all my disks. I migrated everything to the new machine. I poked around for a bit trying to get the machine to boot from the USB key, but when it did, it fired right up, automatically recognized all my disks, and presented everything to me exactly as it had been set up on the Thecus. I instructed it to add Disk 4 to the mix (using the Seagate Iron Wolf Pro I had first tried), and 12 hours later it's all good! Unbelievable. I'm sold on UnRAID forever.

I have been using a Thecus N5550 that I repurposed as an Unraid NAS. It worked great for a couple of years, but the PS may be on the way out and I cannot find a replacement. Is there a comparable simple solution, i.e., can any of the synology or other brands be used to run Unraid.

Interesting. When drive 4 is offline, the parity check passes just fine. I wonder if the power supply in this Thecus unit is fading out...

Diagnostics added to original post.

OK, obviously I am new here. I added the diagnostics I ran after the first rebuild fail.

What kind of diagnostics should I post There are no cables in this Thecus NAS. It is PCB.

My setup was a Thecus N5550 with 6 drives installed: 1. Parity - WDC-WD121KRYZ - 12TB 2. Disk 1 - WDC-WD121KRYZ - 12TB 3. Disk 2 - HGST_HUH721212 - 12TB 4. Disk 3 - 3TB WDC Red 5. Disk 4 - 3TB WDC Red 6. Cache - Samsung SSD 850 Pro 256GB I decided to upgrade Disks 3 and 4 to 10TB Ironwolf Pro. There was no data stored on these drives, it just shows 69.8GB on each. First I replaced Disk 3 with 10TB Ironwolf Pro. Array rebuilt just fine and all was good. Then, I replaced Disk 4 with 10TB Ironwolf Pro. Array rebuild failed giving read errors on new disk. So, I assumed new drive was bad, so I removed it and tried to return the original 3TB WDC Red. Unraid then refused to accept it, claiming new disk needs to be larger than previous disk and expecting at least 10TB. So, then I got a new 10TB Seagate Barracuda Pro and put it in Disk 4. This rebuild also failed giving read errors. Surely both of these new drives are not defective, so what gives unraid-diagnostics-20210416-1431.zip

Is it possible for them not to go to the cache

Really? So no one has any idea about this?

Hi , I installed unRaid 6.8.3 on a Thecus N5550. Overall I love it. BUT, the Thecus used to easily supply 113 MB/s in either direction when writing/reading. Now it will read at ~108MB/s, but writing is usually bouncing around 50-80MB/s. This is with a Samsung 860 PRO SSD setup as a cache, which seemed to make no difference in write performance. Why so slow? Do I have a setting set wrong? unraid-diagnostics-20210416-1431.zip