Very Slow Rebuild

[DeNNii]

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.

[JorgeB]

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.

[DeNNii]

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?

[itimpi]

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.