QUOTE(xxboxx @ Nov 12 2025, 07:15 PM)
It's advisable to mix brand especially if it's for RAID setup.
The idea is to mitigate the risk of simultaneous failures caused by a single bad manufacturing or firmware bug.
But of course need to ensure all have comparable performance such as same RPM speed, capacity and no mixing CMR with SMR drive.
u said it yourself. my reason for not doing so, because the difference in rpm.
if in raid it will choose to use the slowest drive as the speed for all the other drives. so i didnt want that. so i stuck to the 7200 rpm drives. so may as well stick to seagate.
I do have a mix of older wd with seagate on my backup. but it's a backup so thats perfectly fine. U use whatever u have on hand.
but yes u r correct. under the right pre-requisites u can mix match.
i've tried both low rpm and 7200 rpm hard drives for nas before (what i mean is, i use a batch of 4 for each one run separately in their own raidz1 or mdam raid5 so no mix and match). low rpm is nice because less noise and feels like they would last longer. Downside is the performance, is gonna be less than the 7200 rpm. I use a 10g networking setup. So less performance is not really what i want haha...
But that said, i find that with 4x 12tb 7200rpm hard drives, i can't hit 10g speeds. I think i need 6 hard drives to do that.
QUOTE
To achieve sustained 10 Gigabit Ethernet (10 GbE) speeds with
Seagate ST12000VN0008 hard drives in a ZFS RAID-Z1 configuration, you would need at least six drives. However, because this is an edge case, a configuration with eight or more drives is recommended for reliable performance.
Performance calculation
Maximum drive speed: The Seagate ST12000VN0008 IronWolf drive
has a maximum sustained transfer rate of 210 MB/s.
10 GbE throughput: A 10 GbE connection provides a maximum theoretical transfer rate of 1.25 GB/s (
).
RAID-Z1 performance: In RAID-Z1, one disk in the array is dedicated to parity. The array's total sequential read and write speed is the combined speed of the data drives.
The formula is:
Array Speed = (Number of Drives - 1) * Individual Drive Speed
Minimum drive calculation
Using the formula and the drive's specifications, you can calculate the number of drives needed to exceed the 10 GbE network speed.
1250 MB/s (10 GbE) = (Number of Drives - 1) * 210 MB/s
1250 / 210 = Number of Drives - 1
5.95 = Number of Drives - 1
6.95 = Number of Drives
Therefore, based on the raw sustained transfer speed, a minimum of seven drives would be needed to theoretically saturate a 10 GbE connection.
QUOTE
Based on the Seagate datasheet, the power consumption for a single ST12000VN0008 drive is 5.0 watts at idle and 7.8 watts during typical operation.
The percentage difference in power consumption between 4 and 6 drives is 50%, for both idle and operational states.
electricity cost not too bad, replacing 2 additional drives when they die is the main problem. they do die, just a matter of when.
price wise, 4 drives is the limit for me. speed wise, highest i saw was about 5-6g thoroughput r/w with just 4 drives

better than most homelabbers haha..
The drive i got is ST12000VN0008
QUOTE
Seagate IronWolf 12TB (ST12000VN0008)was a previous-generation NAS drive. In 2025, Seagate has updated its product line with the NT-series of IronWolf Pro drives, which now serve as the primary replacements for older models.
The direct replacement for the ST12000VN0008at the same 12TB capacity is the Seagate IronWolf Pro 12TB (ST12000NT001)
says old model but it was recently manufactured so should be ok. i didn't ask what the price was for the newer pro model

actually though AI said it's an older model, there is actually an older model than the 008 which is the ST12000VN0007. So luckily they didn't give me that older model at least. some shops on shopee do list they sell the 007 so at least get the ST12000VN
0008 or the ST12000NT001 for seagate. pro is probably 5 year warranty but will cost extra. so 008 which is a non pro with 3 year warranty may be more attractive if on a budget.
https://www.reddit.com/r/DataHoarder/commen...is_write_cache/QUOTE(babylon52281 @ Nov 12 2025, 07:47 PM)
Thanks for the very detailed details. And yes Viewnet is as legit as any lowyat shop will get. Then again back when physical buying was the only way, even these major shops do have some bad customer experience stories (all of them have to a certain degree).
Since warranty is that important to you, paying that more for a peace of mind with that assurance is well worth it imo.
Cant blame the seller pricing too as AI is sucking HDD back from the dead of being obsoleted when many of the HDD players had over the years been downsizing its production and replacing capacity with SSD (WD & Seagate).
when i enable scrutiny metric, my drives dont pass. only this new drive passed. but when i set to smart only, all pass

scrutiny metric can get false positives at times. i only rely on smart mostly to tell if the drive is dying.
even smart isn't fully reliable but based on my own experience, when smart shows some indication of failure, usually it's spot on in my experience. so i do replace when i see something is going wrong
This post has been edited by Moogle Stiltzkin: Nov 14 2025, 08:55 AM