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btrfs drive replacement (lemmy.world)
submitted 2 years ago by to c/selfhosted@lemmy.world
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Referencing: https://lemmy.world/post/17588348

I want to make a NAS with a 500GB boot drive and 2x16TB HDDs. Based on my previous post, btrfs is a good option. It also looks easy to get started. My plan for the NAS would be to purchase several 16TB drives, and only use 2 of them.

My first question is about different drives. Could I purchase two different brand drives and use them with btrfs? (I assume yes)

2nd question: how does the replacement process go? Like if drive A died, so I remove it, and put a brand new replacement in. What do I have to do with btrfs to get the raid 1 back going? Any links or guides would be amazing.

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[–] 1 point 2 years ago (1 child)

if you buy two identical drives (at the same time), the likelyhood of both drives failing around the same time is severely higher.

I need sources, this sounds extremely unlikely. That's basically 2 "independent” probabilities.

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  • [–] 2 points 2 years ago*

    The reasoning is that drives are produced and shipped in batches and if you order multiple at onces there is a higher chance you'll get drives from the same batch. If that batch had some fault during production or it was damaged during shipping, all your drives might be affected.

    I don't have a source, but it's something multiple expirenced people have mentioned to me.

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