Our RAID 1 is being expanded from 4 TB to 8 TB. The GUI status looks like this:
The progress happens by about 1% per day. At the same time, the server is quite slow. This seems like an extremely slow rate of progress. This amounts to 4TB/100/86400 = 460KB/s. I'd expect the RAID controller to merely write zeroes sequentially to the new segments which should happen much faster.
I do not believe that the server is otherwise so loaded as to cause such a massive slowdown.
According to SMART data, the disks are new and healthy.
What could be a reason for this and is it possible to speed this up? Limping along like this for about 100 days does not seem very desirable to me...
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