February 28, 20179 yr Help needed. My Unraid HW configuration say consist of 10 disks of 3TB. If #5 of the 10 disks failed (I've removed it) and #8 is failing (SMART errors). Can I preclear 1 new disk (replacement for #5) and copy data on #8 to say #6 (given #6 is empty) AT THE SAME TIME ? Will the "copy" data from #8 to #6 invalid the parity on the parity disk ?
February 28, 20179 yr You need to be aware of the bug that is around when you copy date from one drive User Share to another - you might be better off using unbalance if you are not sure. You need to get that Drive 5 replaced asap though - it isn't only the data on 8 I would be worrying about more the fact that if 8 fails or has lots of errors you wont be able to recover drive 5 (assuming you only have a single parity drive). If it was me I wouldn't want to be messing with drive 8 until I had drive 5 replaced and parity rebuilt. Then I would swap drive 8 out and let that rebuild as well. Cheers Stuart Edited February 28, 20179 yr by schford corrected disk copy to user share
February 28, 20179 yr Community Expert 7 hours ago, jowy_ham said: Help needed. My Unraid HW configuration say consist of 10 disks of 3TB. If #5 of the 10 disks failed (I've removed it) and #8 is failing (SMART errors). Can I preclear 1 new disk (replacement for #5) and copy data on #8 to say #6 (given #6 is empty) AT THE SAME TIME ? Will the "copy" data from #8 to #6 invalid the parity on the parity disk ? Please go to Tools - Diagnostics and post the complete diagnostics zip.
February 28, 20179 yr Community Expert 7 minutes ago, trurl said: Please go to Tools - Diagnostics and post the complete diagnostics zip. In fact, it would have been better if you had posted the diagnostics before removing disk5. Can you put the disk back in so we can see it in your diagnostics? Please don't proceed without further advice. 4 hours ago, schford said: You need to be aware of the bug that is around when you copy date from one drive to another You have this exactly backwards. You should avoid mixing disks and user shares. Copying from one drive to another is fine, but possibly not the best approach in this specific situation.
February 28, 20179 yr Given that you are already running at risk and have a potentially 2nd failing disk, I'd skip the pre-clear and just do a replacement for disk #5 NOW. Assign the new disk as #5; Start the array and let it do the rebuild; and then (when it completes) do a non-correcting parity check to confirm all went well. Note that the mere act of doing the rebuild, followed by the parity check, will do a complete set of writes to the new disk, followed by a full read of the disk to confirm everything is correct ... so it will be reasonably well tested via this process. The only thing that pre-clear would give you beyond that is a comparison of the before & after SMART values -- and you could actually do that yourself by simply doing a SMART test before you do the rebuild; and another one after it's done. Once #5 is replaced, then you can replace #8.
February 28, 20179 yr Community Expert 2 hours ago, garycase said: Given that you are already running at risk and have a potentially 2nd failing disk, I'd skip the pre-clear and just do a replacement for disk #5 NOW. Assign the new disk as #5; Start the array and let it do the rebuild; and then (when it completes) do a non-correcting parity check to confirm all went well. Note that the mere act of doing the rebuild, followed by the parity check, will do a complete set of writes to the new disk, followed by a full read of the disk to confirm everything is correct ... so it will be reasonably well tested via this process. The only thing that pre-clear would give you beyond that is a comparison of the before & after SMART values -- and you could actually do that yourself by simply doing a SMART test before you do the rebuild; and another one after it's done. Once #5 is replaced, then you can replace #8. This is a good approach, The only reason I didn't give that advice up front is because we don't know why disk5 failed, and we don't know what the SMART error for disk8 is, and indeed we don't know anything else about any of the other drives. So I was hoping for a diagnostic. I guess since he is going to replace disk5 with another (new?) disk maybe proceeding blindly is unlikely to make anything worse.
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