November 4, 20232 yr Just looking to see if anything can be done or if I'm just hosed. I've been upgrading my array from 4x 2TB drives to 4x 8TB drives with one parity drive. Parity swap and rebuild went fine. Disk 1 rebuild seemed to go fine, but when I started to rebuild Disk 2, I got a Read Error on Disk 1 that I didn't notice before and periods of super slow speeds during the rebuild (<1 MB/s). I have the old drives, but unraid doesn't seem to see them as valid old drives as part of the array anymore and want to rebuild when I attach them (and then fails because they're smaller than the 8TB drives). So right now my thought is to see if the rebuild of the new Disk 2 will finish in a reasonable time, then replace Disk 1 and rebuild it again. Then move on to Disk 3. If the rebuild doesn't finish (or takes the projected 45 days during the slow periods...) then I might have to get creative on how to backup the array so no data loss occurs.
November 4, 20232 yr Community Expert Post your diagnostics in a new post in this thread. The Gurus need to see what might be going on. (Did you check to make sure that all SATA connectors were firmly seated after each drive replacement?)
November 4, 20232 yr Community Expert Guard the old 2TB drives with your life. They contain the actual complete files. You can mount them via the Unassigned Devices plugin and copy them back to the array should that become absolutely necessary. But don't be going down that route right at this moment. Let the Gurus have a good look at that diagnostics file as there are many other things that will cause slow reads.
November 5, 20232 yr Community Expert Disk1 appears to be failing, because of that disk2 cannot be successfully rebuilt, if you still have old disk1 do a new config with it and re-sync parity, only then proceed with replacing more disks.
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