Hello, I’m relatively new to self-hosting and recently started using Unraid, which I find fantastic! I’m now considering upgrading my storage capacity by purchasing either an 8TB or 10TB hard drive. I’m exploring both new and used options to find the best deal. However, I’ve noticed that prices vary based on the specific category of hard drive (e.g., Seagate’s IronWolf for NAS or Firecuda for gaming). I’m unsure about the significance of these different categories. Would using a gaming or surveillance hard drive impact the performance of my NAS setup?
Thanks for any tips and clarifications! 🌻
I’m a big fan of Backblaze’s failure statistics. https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data
Annualized failure rates go from 0.3%/year to 3+%/year, even just looking at the drives they have million+ hours for, and I’d rather be at the lower end of that 10x range.
As you are looking for bulk data storage, the drive’s speed isn’t of too much concern. A 5400RPM drive is plenty.
If you are looking to put this drive into an array with other drives, make sure you get a CMR drive as SMR drives can drop out of arrays due to controllers finding them unresponsive. If a drive does not list it is CMR, it’s best to assume it isn’t. Seagate has a handy CMR chart, for example.
Additionally, if there are multiple spinning drives in the same enclosure, getting drives with vibration resistance is a good bonus. Most drives listed for NAS use will have this extra vibration resistance.
Is this for hardware RAID controllers, or have you experience software RAID like LVM or ZFS exhibiting the same drop out behavior? I personally haven’t but it be nice to look out for future drives.
I have not personally experienced a dropout with a SMR drive. That is from the reporting I saw when WD was shipping out SMR drives in their Red (NAS) lineup and people were having all kinds of issues with them. According to the article (below), it sounds like ZFS has the worst time with them. WD also lost a class action suit over marketing these as NAS drives, while failing to disclose they were SMR drives (which don’t work well in a NAS).
We want to be very clear: we agree with Seagate’s Greg Belloni, who stated on the company’s behalf that they “do not recommend SMR for NAS applications.” At absolute best, SMR disks underperform significantly in comparison to CMR disks; at their worst, they can fall flat on their face so badly that they may be mistakenly detected as failed hardware. Source
I remember this - I had just bought my second drive for my nas (raid1, original drive cmr), and it was performing like shit. The next day, news broke about this bullshit and a couple days later, the suit was started. I was fucking pissed, the drives were still having trouble, with terabytes of irreplaceable data at risk while the two drives struggled to mirror. I got in contact with wd and after some back and forth bullshit, I straight-up threatened to join the class and blacklist wd for all my personal, family/friends, and client’s builds, if they didn’t rma the drive immediately and send me a cmr replacement. I’ve been 100% wd for over 20 years, and I have decent reach as to what I recommend and buy for people.
They sent me a cmr drive via express shipping. I continue to buy wd drives (two more disks in that machine, an external backup, an internal desktop pcie raid0 nvme+card, an internal backup drive for my desktop, a backup ssd for one of my laptops…), but with much more scrutiny. I did not join the class, but it’s still a black mark in my book. I’ve been thinking about giving Toshiba a whirl, their drive reviews look good. Maybe next upgrade…
Yeah, you don’t want a surveillance drive. They are optimized for continuous writes, not random IO.
It’s probably worth familiarizing yourself with the difference between CMR and SMR drives.
If you expect this to keep growing, it might make sense to switch to SAS now - then you can find some really cheap enterprise class drives on ebay that will perform a bit better in this type of configuration. You’d just need a cheap HBA (like a 9211-8i) and a couple breakout cables. You can use SATA drives with a SAS HBA, but not the other way around.
Thanks for the tips! I dought I’ll be going higher that 50TB at max. Would SAS still be nessecary for that you reccon?
Definitely isn’t necessary, but if you search for ‘3.5" SAS lot’ on ebay you might find all the drives you’ll need to get to 50TB for the price of a couple new SATA drives.
Apart from the SMR vs. CMR, if your NAS will run 24/7 you need to make sure to use 24/7 capable drives or find a way to flash a 24/7-specific firmware/setting to a consumer drive. Normal consumer drives (e.g. WD Green) tend to have a lot of energy saving features, e.g. they park the drive heads after a few seconds of inactivity. This isn’t a problem with normal use as an external drive that only gets connected once in a while. But in a 24/7 NAS the drive will wake up lots of times and park again, wake up, park again … and these cycles kill the drive pretty fast.
https://www.truenas.com/community/threads/hacking-wd-greens-and-reds-with-wdidle3-exe.18171/
Lots of good advice here. I’ve got a bunch of older WD Reds still in service (from before the SMR BS). I’ve also had good luck shucking drives from external enclosures as well as decommissioned enterprise drives. If you go that route, depending on your enclosure or power supply in these scenarios you may run into issues with a live 3.3V SATA power pin causing drives to reboot. I’ve never had this issue on mine but it can be fixed with a little kapton tape or a modified SATA adapter. It’s definitely cheaper to shuck or get used enterprise for capacity! I’m running at least a dozen shucked drives right now and they’ve been great for my needs.
Also, if you start reaching the point of going beyond the ports available on your motherboard, do yourself a favor and get a quality HBA card flashed in IT mode to connect your drives. The cheapo 4 port cards I originally tried would have random dropouts in Unraid from time to time. Once I got a good HBA it’s been smooth sailing. It needs to be in IT mode to prevent hardware raid from kicking in so that Unraid can see the individual identifiers of the disks. You can flash it yourself or use an eBay seller like ThArtOfServer who will preflash them to IT mode.
Finally, be aware that expanding your array is a slippery slope. You start with 3 or 4 drives and next thing you know you have a rack and 15+ drive array.
On the power disable feature topic, I’ve only bought a few used enterprise drives from Goharddrive.com and Serverpartsdeals.com, but they both included a handy little SATA power adapter with each drive for exactly that reason.
The first desktop I installed them in worked just fine with the factory PSU cables, but when I upgraded I was left scratching my head for a few minutes until I remembered those adapters!
Thanks for all the input and feedback - really appriciate it :) I still have quite the way to go to learn some of what these terms are. I have one PCI-e card for expanding the amount of Sata ports, wether is a cheapo card or not im not entierly sure(got it secondhand via a package deal), but have been using it for half a year now without any issues :)
