Hi guys,

Newbie here, just setup a Unraid nas/server and am setting everything up and testing before purchasing the license.

Anyway I have swapped out a drive and am getting very slow rebuild speeds (currently running at 8.9MB/s. I have enabled turbo write but no increase.

I5

16GB ram

All 7200 rpm drives.

Happy to attach any logs that might help if you wouldn't mind telling me how to, I am still very new to Unraid and still learning.

Thanks in advance.

Jay

Turbo has no effect on rebuild since all disks are already involved.

Attach Diagnostics ZIP to your NEXT post in this thread.

29 minutes ago, trurl said:

Turbo has no effect on rebuild since all disks are already involved.

Attach Diagnostics ZIP to your NEXT post in this thread.

Good to know, thanks.

2 hours ago, trurl said:

Attach Diagnostics ZIP to your NEXT post in this thread.

Thank you, log file attached.

Jay

nas01-diagnostics-20251115-1327.zip

There are other writes going on to the array, stop them all, and the rebuild speed should increase a lot.

11 minutes ago, JorgeB said:

There are other writes going on to the array, stop them all, and the rebuild speed should increase a lot.

Thanks for the reply.

So I have started moving some data to it now but it wasn't very fast before, the highest I see it go was 112 MB/s with nothing writing to it at all.

I have now killed off other copies but still going so, fresh logs attached.nas01-diagnostics-20251115-1440.zip

Stats on the diags are strange; there are 3 disks showing a considerably slower read speed, but all 3 have exactly the same, post a screenshot from main with the toggle set to show the drive's real time speeds.

Thanks, here is the screenshot:

17 hours ago, JorgeB said:

with the toggle set to show the drive's real time speeds.

Speed has increased but I suspect because its at about 95% complete, before this it was a constant 23MB/s

Quick search on Toshiba MN10ADA10TS ... SMR drives. SMR speeds are known to be pretty poor.

Nope - MN10ADA10TS is CMR

https://toshiba.semicon-storage.com/content/dam/toshiba-ss-v3/master/en/storage/product/internal-specialty/HDD-NSENC.pdf

55 minutes ago, Jaylam said:

peed has increased but I suspect because its at about 95% complete, before this it was a constant 23MB/s

You may have a slow disk; run the diskspeed container after the rebuild finishes to see if all disks look normal.

Just running disk speed now. Will post the results shortly.

So what are we saying here for a newbie. SMR = bad but CMR = ok?

1 hour ago, ConnerVT said:

Nope - MN10ADA10TS is CMR

https://toshiba.semicon-storage.com/content/dam/toshiba-ss-v3/master/en/storage/product/internal-specialty/HDD-NSENC.pdf

Huh. I wonder what I was looking at.

6 minutes ago, Jaylam said:

Just running disk speed now. Will post the results shortly.

So what are we saying here for a newbie. SMR = bad but CMR = ok?

Basically, SMR is slow. Cheaper high capacity drives use that 'shingled' tech. CMR is 'conventional' media. Faster but I'll ess density. CMR drives perform a lot faster.

18 minutes ago, Veah said:

Basically, SMR is slow. Cheaper high capacity drives use that 'shingled' tech. CMR is 'conventional' media. Faster but I'll ess density. CMR drives perform a lot faster.

Ah ok thanks for the info.

Here is the speed test results

Speed will be much slower while the 1TB disk is involved; it will speed up a little after that but slow down again while the 2TB disks reach the inner sectors, after those are done, it should be much faster until reaching the inner sectors of the 6TB drives, and so on, follwing the red line:

I see, thanks. These small drives are only there for the time being to give me enough space to migrate all my data off my Qnap, once its moved over I can then recover the disks from my Qnap and start swapping out the small old disks.

Thanks for the help