February 7, 20242 yr Hiya, I recently replaced a 4TB drive before discovering the issue was that the power cable needed replacing, so I thought I'd put it back into my array to replace one of the 2TB drives in there. I erased the 4TB on another machine, and then plugged it into my array replacing the 2TB drive. With a stopped array I selected the new drive to go in place of the missing drive, then started the array in Maint mode and then clicked Sync. The sync too about 8 hours but appears to have completed successfully - I noted that one of the array drives reported nearly 100% errors in the reads during the sync, but I figured I'd let it finish. I stopped the array and then started it again and now the 4TB I put in is showing as "Unmountable: Unsupported or no filesystem". Should I have formatted the drive in the array before syncing? I think I'd assumed that the sync would overwrite whatever was on the drive before. Should I correct it by formatting the drive (somehow) and then trying the sync again? And, the massive number of read errors - could that be anything to do with a cable being disturbed when I was fitting the replacement drive? Many thanks! beehouse-diagnostics-20240207-2246.zip
February 7, 20242 yr Community Expert Any errors on other drives during the sync operation will have caused corruption on the drive being rebuilt as the rebuild process requires all other drives to be read without error to avoid corruption on the rebuilt drive.
February 13, 20242 yr Author OK, I understand that. I've checked the connections and tried booting up again - I'm not sure what my next move should be though. Disk 3 is showing as unmountable. If I put the array into Maintenance mode and tick the Format Drive box I get a warning that says a format should never form part of a sync operation. If I stop the array and remove this drive it lists the drive in the "missing drives" list underneath. Is there a way to re-sync on to this drive again and hopefully see if the read errors on the other drive stop happening?
February 13, 20242 yr Author Ah! Never mind, I figured it out! I stopped the array, removed the drive from the array, started the array again, stopped the array, added it back - and when I restarted in Maintenance Mode the Sync option was available again. All looking good so far... (and a huge sigh of relief was heard)
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