Majyk Oyster

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About Majyk Oyster

  • Birthday 05/08/1982


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  1. You can use PSU Calculator to make sure, but both those PSU should be fine. Hard drives don't need that much power.
  2. Both seem to be just as fast while the data is written. I guess the extra work needed for a move is done once the transfer in completed, and the source file deleted. It's data to data (/mnt/diskA > /mnt/diskB/). I just witnessed such a transfer at 80MB/s, so the aforementioned fluctuation is indeed confirmed.
  3. As the parity is done rebuilding and the array is protected once again, I checked various things : - Reads to the array from ethernet are stable at 120MB/s (which is pretty nice). - Writes from ethernet to cached shares on the array are stable at 80MB/s. - Writes from ethernet to non cached shares on the array are stable at 80MB/s. - Disk to disk transfers within the array start around 120MB/S and slowly stabilize around 50MB/s. I've double checked, the files indeed land on /mnt/cache/ or /mnt/diskX/ as they're supposed to. I'm not sure how to simulate the varying speed of parity reconstructing writes, depending on the disks reading data and the position of the data on the platters. That makes me wonder : are my array disks too fast to allow my cache (SSD) to make any difference on array writes ? The wiki page might be a little outdated on that subject, since mentioned speed and sizes are those of 2011 hardware.
  4. Absolutely, every word of it. I only used the Read/Modify/Write mode for a few tests, my array is configured with turbo mode. Disk rotation wait shouldn't be an issue (?). As I understand things, considering Diskspeed results and the way turbo mode works, the slowest writing speed would be around 60MB/s when reading from the end of my 3TB WD Green disk to reconstruct parity, but it also could be much better when writing past the "half" of my parity drive, which means reading only from faster disks. So I don't get why I never experienced better speeds since I activated parity. I could still be missing something though.
  5. Thanks for the details, much appreciated. Seems like a wasted a bunch of time and a perfectly good parity then. 😁 The WD Greens can definitely max out that 60MB/s "hard limit", so I guess it's pointless replacing them while using parity. I'd still love to know exactly what's the limiting factor in all this, but that may be Unraid secret sauce. On a side note, I shrunk my VM and docker.img, so now I have under 3,5GB used space on the cache, and it's also freed of all automated writes. That should let it breeze a little.
  6. Exactly, disk to disk within the array using MC or another CLI command. I can't find any reference of what to expect performance-wise on average/enthusiast/non-pro hardware, so I have a hard time knowing what's normal and what could be improved. Troubleshooting something that's not broken can be hard sometimes. 🤓
  7. Thanks for the input. That's closer to what I first imagined. I just installed Dynamix stats, so there's not much data to inspect right now. But I took a closer look at the parity sync (still running). It just went over 50% (4TB) while I was watching, which is where WD Greens are not used anymore, and only the Reds and the Ironwolf are left. The speed instantly went from 70MB/s to 160MB/s. During the first hours, the speed was around 110-120MB/s. The last time I made a parity sync, it ended with a 120MB/s average speed. So everything looks normal and coherent with the Diskspeed results so far, regarding parity sync at least. Before : After : However, writing from a Red disk to another, using read/modify/write mode so the Greens don't slow everything done, shouldn't I get better performance than 40-60MB/s ? It didn't seem to make any difference when I tried yesterday. I did quite a bunch of tests with disk to disk transfers before removing the parity, I doubt they where all impacted with the WD Green end of platter speeds. Replacing those WD Greens with more Reds (shucked white labels actually, don't tell WD) is very tempting indeed. I've added 3x8TB drives to the server in the last few weeks (and retired a pile of 1-3TB disks), so my computer budget is kinda burned right now. I might try to replace the Greens with old but functional 7200rpm drives that sit on my desk collecting dust, that could make things better I guess (unless I find it's pointless in the meantime). After a bit of tinkering, I only use high-water now. Thanks for the input nonetheless !
  8. Thanks for your replies. I expected some overhead, but I had no idea how much since I have 0 experience with software raid-like solutions. I couldn't find any infos to roughly quantify real life performances. I'm still moving/sorting lots of data (disk to disk) to make my server nice and tidy, which would bypass the cache. That kind of transfer should diminish drastically soon. I'm still somewhat confused : since the CPU, RAM and bandwidth are all far from saturation, what would the typical limiting factor ? Could I do anything to slightly improve things ? The only reason I set the mover hourly is because I used the small 120GB SSDs I had laying around, and they fill up pretty quickly. Ideally I would switch to 480GB-960GB SSDs and use the default nightly mover setting. I never enabled the cache on shares containing huge files (20GB+). Disabling it for all shares used mainly for automated transfers is indeed something to consider, thanks for the input. Not that I can tell, the wiki and the forum helped me with every issue I had so far.
  9. Hi folks, I've been trying Unraid for the past month (1 hour remaining on my trial actually), and I'm quite pleased with it so far. Since I'm impatient, have proper backups and had my future parity drive stuck somewhere due to COVID-19, I first set everything up without parity. All was fine, transfer speed within the server was around 150-180 MB/s on average. Last Monday, the parity drive finally arrived. I precleared it (I get it's not necessary anymore, point was avoiding premature failure issues), set the disk as the new parity, and let Unraid do it's job for the next 17 hours (for a 8TB drive). I then tuned everything up according to the wiki, Spaceinvader One amazing videos and this very forum. Everything seemed to work fine, except files transfers between disks or to the shares slowed down a whole lot. They now start around 120 MB/s, and usually stabilize around 40-60 MB/s a few minutes later (using MC or any CLI tool). Time: 0:00.08 ETA 0:07.05 (164.92 MB/s) Time: 0:00.15 ETA 0:10.05 (114.67 MB/s) Time: 0:00.24 ETA 0:11.30 (99.59 MB/s) Time: 0:01.22 ETA 0:13.19 (80.77 MB/s) Time: 0:07.25 ETA 0:09.21 (70.66 MB/s) ... The rig : Intel i5 3570k (4 cores) Gigabyte H77N-WIFI 8 GB DDR3 Dell H200 controller (flashed in IT mode, fresh thermal paste and brand new Noctua fan. Heat sink is barely warm) It seems more than capable for my needs, considering the minimum specs in the documentation. I barely use anything except the NAS features. I only run a very small Debian VM, to have a secured interface between Unraid and my distant servers. It does nothing 90% of the time, and was disabled during troubleshooting. I don't run any Docker container, except DiskSpeed during the benchmarks. The disks : Note : still waiting for an extra SATA power cable to plug my second SSD and set a RAID1 for cache. The mover runs hourly, so the limited capacity is sufficient for my needs. Troubleshooting so far : First I benchmarked the disks, which doesn't show anything special to my knowledge. No controller induced bottle-neck. The 2 old WD Green drives are obviously slower, so I though that maybe reconstruct write for the parity wasn't optimal, since any write on the array makes the other disks read. Switching to read/modify/write made no difference, so I went back. I re-wired everything in the server, checked the controller cooling, still no cookie. The only issue I can see in the syslog is a seemingly random NTP drift, but I doubt it's relevant. In a desperate move, I unassigned the parity drive, which immediately fixed the speed issue. Parity-Sync is running as I write to revert that bold move. I've attached the diagnostics. Sorry the log is so short, I've rebooted the server a few dozens times in the last couple days. If necessary I'll let it run for a few days and upload it again. Any help would be appreciated, I've no clue what to do next. 🤓