this post was submitted on 11 Jan 2025
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How old are the disks in your NAS? (lemmy.fwgx.uk)
submitted 2 years ago by blackstrat@lemmy.fwgx.uk to c/selfhosted@lemmy.world
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I have a ZFS RAIDZ2 array made of 6x 2TB disks with power on hours between 40,000 and 70,000. This is used just for data storage of photos and videos, not OS drives. Part of me is a bit concerned at those hours considering they're a right old mix of desktop drives and old WD reds. I keep them on 24/7 so they're not too stressed in terms of power cycles bit they have in the past been through a few RAID5 rebuilds.

Considering swapping to 2x 'refurbed' 12TB enterprise drives and running ZFS RAIDZ1. So even though they'd have a decent amount of hours on them, they'd be better quality drives and fewer disks means less change of any one failing (I have good backups).

The next time I have one of my current drives die I'm not feeling like staying with my current setup is worth it, so may as well change over now before it happens?

Also the 6x disks I have at the moment are really crammed in to my case in a hideous way, so from an aesthetic POV (not that I can actually seeing the solid case in a rack in the garage),it'll be nicer.

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[–] walden@sub.wetshaving.social 2 points 2 years ago* (last edited 2 years ago)

I'm glad you asked because I've sort of been meaning to look into that.

I have 4 8TB drives that have ~64,000 hours (7.3 years) powered on.
I have 2 10TB drives that have ~51,000 hours (5.8 years) powered on.
I have 2 8TB drives that have ~16,800 hours (1.9 years) powered on.

Those 8 drives make up my ZFS pool. Eventually I want to ditch them all and create a new pool with fewer drives. I'm finding that 45TB is overkill, even when storing lots of media. The most data I've had is 20TB and it was a bit overwhelming to keep track of it all, even with the *arrs doing the work.

To rebuild it with 4 x 16TB drives, I'd have half as many drives, reducing power consumption. It'd cost about $1300. With double parity I'd have 27TB usable. That's the downside to larger drives, having double parity costs more.

To rebuild it with 2 x 24TB drives, I'd have 1/4 as many drives, reducing power consumption even more. It'd cost about $960. I would only have single parity with that setup, and only 21TB usable.

Increasing to 3 x 24TB drives, the cost goes to $1437 with the only benefit being double parity. Increasing to 4*24TB gives double parity, 41TB, and costs almost $2k. That would be overkill.

Eventually I'll have to decide which road to go down. I think I'd be comfortable with single parity, so 2 very large drives might be might be my next move, since my price per kWh is really high, around $.33.

Edit: one last option, and a really good one, is to keep the 10TB drives, ditch all of the 8TB drives, and add 2 more 10TB drives. That would only cost $400 and leave me with 4 x 10TB drives. Double parity would give me 17TB. I'll have to keep an eye on things to make sure it doesn't get full of junk, but I have a pretty good handle on that sort of thing now.