Updated:11:03 PM CEST Aug,09
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NAS 10GbE Upgrade Hits Hidden Limit - tech|
| (hx) 10:30 AM CEST - Aug,09 2026 | 
An XDA writer upgraded his NAS to 10 Gigabit Ethernet and quickly found the real bottleneck was not the network.
With only two 20TB hard drives running in SHR (RAID 1 mirror), write speeds topped out around 259–290 MB/s — just a fraction of 10GbE capacity.
Sustained reads also stayed near 274 MB/s because a single client cannot benefit from mirrored drives.
The NAS CPU and RAM were not the limiting factors in this setup.
To fully use 10GbE speeds, the author notes that more drives or SSDs would be required.
I’m writing this more out of curiosity, because this is probably something all my long-time readers already know. I don’t know what that person was expecting—that upgrading the LAN would make it run 10 times faster? LOL. I have a Synology myself, and it’s not that fast even with SSD caching. But for what I do, it’s enough for me (streaming movies from the web and some basic work with documents). However, when I really need speed, it starts to get pretty expensive :-( You need pretty expensive NVMe drives like the Samsung 9100 Pro, Kingston Fury Renegade G5, or Crucial T705. And that fast 4TB Samsung currently costs 825 euros, which is outrageous.
Even when you buy these super-expensive SSDs, you have to have realistic expectations—that is, with 4 × Samsung 9100 Pro in a well-configured mirrored ZFS setup + 25GbE networking, you can achieve:
Sequential reads: 8–12+ GB/s
Sequential writes: 6–10 GB/s
Excellent random performance for many concurrent users
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last 10 comments: | Csimbi | (11:42 AM CEST - Aug,09 2026 ) | [code:1:39b95a6ff5]259–290 MB/s[/code:1:39b95a6ff5]
That is a VERY low write speed for a NAS in RAID 1.
Possible causes:
- your host is just bad (some cheap foreign shite),
- you use only two disks,
- the disks used are slow (e.g., some old HDDs from laptops or something)
- your RAID controller is faulty,
- the array is degraded (unlikely because RAID 1 does not care about losing data),
- or something.
My RAID 6 - which is much slower than RAID 1 - can write 300-400MB/sec, locally. I say 'locally' because I don't have 10GbE to drive it via network -> I can test speed only locally.
When I tested the disks one by one, they could write 100MB/sec random and 250 MB/sec each, alone. Ok, these are WD Ultradrive drives, but take any 8 stupid drive that can do 50-70 in RAID and the speed will multiply to 400+.
On RAID 1, done properly, you should be getting >1000MB/sec speeds.
It's funny how people with zero intelligence can always afford these things while the rest of us... Nevermind.
All in all, I think the author failed, no need to blame technology. |
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