[tracker1]

Good advice, though I once had about half a dozen drives (12 drive RAID Z2 with 2 as hot spares) fail within a few weeks of each other in separate batches from sourcing. (Seagate 3TB drives, I think there's been articles on how bad that series was).

[tfigment]

I don't know how i survived those Seagates. Lasted maybe a year and started dropping like flies. Synology seems to recommend identical drives as i recall but work fine with different sizes and makers afaict.