November 1, 20223 yr Hi guys I just got back into Unraid recently and build a 20bay nas to migrating drives and data to the new NAS. I am having inconsistent or very very long rebuild times. My Last 2 drives i swapped out it took about 3-4 days from memory but for this one its just way to long. Would this procedure also be faster if i moved the data from the disks being replaced out first with Unbalance?. At the moment i had a handfull of bigger drives and will replace all the 3-6tb drives with 8TB Drives and then replace all those with 12TB+ Drives and at this rate my little exercise will take me a year plus. Also will it be faster to replace 1 drive at a time instead of 2? My Rebuild speed last few days has been 1-4MB/Sec monsta-nas-diagnostics-20221101-1227.zip I would like to thank everyone in advance. Also, if you find the issue, please let me know how to identify it in the future.
November 1, 20223 yr Community Expert Solution There's something writing to the array during rebuild, disks 2 and 3 are being rebuilt while there are writes to disks 1, 6, 7, 8 and 9, this will make the rebuild (and writes) extremely slow.
November 1, 20223 yr Author I am Migrating data from multiple Synology 8 bay units. But you seem to be correct. This morning 1 mirror task finished at some point and rebuild time went back to about a day or so. So would it be fastest to turn off everything during rebuild? Including Docker etc?
November 1, 20223 yr Community Expert 1 hour ago, DeNNii said: So would it be fastest to turn off everything during rebuild? Including Docker etc? Any other drive activity during a rebuild will adversely affect the performance of the rebuild so avoiding it if at all possible is highly desirable.
October 20, 20241 yr Sorry I'm coming back to this topic because for a few days I had a problem with a disk that died, after replacing it (with a used hard disk) I noticed that the data rebuild was going very slow so instead of 50-60 mb/sec, it was going at 2.5 mb/sec. So I thought the problem was the HP H240 controller, so I bought a new one, disabled RAID and installed it, however even now with the new controller it is still going slow at 2.5 MB/sec: Estimated speed: 2.5 MB/sec Estimated finish: 27 days, 19 hours, 58 minutes I attach the diagnosis file. Thanks for anyone who can help me! tower-diagnostics-20241020-2150.zip
October 20, 20241 yr Community Expert Nothing obvious logged, run the diskspeed docker test to see if the disks are performing normally.
October 21, 20241 yr I bought a 6tb drive identical to the others I already own, and now everything works like a charm. Total size: 6 TB Elapsed time: 17 minutes Current position: 117 GB (1.9 %) Estimated speed: 113.2 MB/sec Estimated finish: 14 hours, 26 minutes Now I would like to understand what happened to that broken hard disk. Obviously I unplugged it from my unraid server, however I am asking how I can do a complete disk check and related repair (if possible) from another pc where I have both a windows and ubuntu. Can I do this? I would not want to throw away the disk.... Thank you very much for the prompt disposition last night!
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