Hi, I had a power supply issue and my 18TB storage drive dropped from the array, and when I readded it, it started a rebuild. after a while the power supply started failing harder and forced a shutdown. After replacing it today, I have two more drives that are not showing up. I've replaced sata cables, swapped them with known good cables, ports and power connectors. I'm willing to accept losing those 2 drives that failed today and their data, but the one that was rebuilding has nearly 8TB of data and I don't want to lose all 3.

 

If I do a new config so I can at least get my array started up again, will I lose all of the data on the drive that was rebuilding?

 

I've attached diagnostics from earlier this month and from today.

tower-diagnostics-20250227-2211.zip tower-diagnostics-20250210-2150.zip

Your parity is only valid for ALL of the disks, so your best chance would be if you could New Config/Trust Parity with ALL of the disks assigned just as they were.

the only problem I forsee with that, is two of the disks are still not showing up. which means I have a drive that's needing rebuilt, and two that are missing. If I don't new config to drop those two drives, I can't start my array. I don't WANT to lose data, but I don't see any way of not losing at least those two. My concern is if I will lose the data on the 18 or not.

I guess at this point, I should just grit my teeth and do it and see what happens. I'll post in here after I figure it out.

To have a chance of rebuilding the other drive, you would need to bring back the two missing ones.

You could try to mount the important disk as an Unassigned Device and see if you could get data from it without rebuilding.