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3:2:1 - Cattle not pets - If your data is backed up in multiple sites, the death of one site shouldn't overwhelm you, and give you time to recover.
If your primary site drives are getting above their designed lifetime, rotate them out, sure - but they could be used as part of the backup architecture else where (like a live offsite sync location with enough tolerance for 2 disk failures to account for the age).
3 copies of your data; 2 types of media; 1 copy offsite.
I mean if it's homelab, it's ok to be pets. Not everything has to be commoditized for the whims of industry.
I get that. But I think the quote refers to corporate infrastructure. In the case of a mail server, you would have automated backup servers that kick-in and you would simply pull the rack of the failed mail server.
Replacing drives based on SMART messages (pets) means you can do the replacement on your time and make sure you can do resilvering or whatever on your schedule. I think that is less burdensome than having a drive fail when you're quite busy and being stressed about having the system is running in a degraded state until you have time to replace the drive.
Ah, thank you for explaining. I understand where you're coming from. Nevertheless, from the point of a view a small NAS, RAIDZ1 is much more space and cost efficient so I think there is room for "pets" in the small homelab or NAS.
Yep, numbering's the key.
When you create NAS01, you know there's going to be a NAS02 one day
And then Skynet remembers..