To be honest, nothing.
Running my home server on a nuc with proxmox and a 8 bay synology Nas (though I'm glad that I went with 8 bay back then!).
As a router I have opnsense running on a low powered mini pc.
All in all I couldn't wish for more (low power, high performance, easy to maintain) for my use case, but I'll soon need some storage and ram upgrade on the proxmox server.
Not go as HAM on commercial server hardware. iLO is really nice for management though...
I have ended up with 6x 2TB disks, so if I was starting again I'd go 2x10TB and use an IT mode HBA and software RAID 1. I'd also replace my 2x Netgear Switches and 1x basic smart TP-Link switch and go full TP-Link Omada for switching with POE ports on 2 of them - I have an Omada WAP and it's very good. Otherwise I'm pretty happy.
The only real pain point I have is my hard drive layout. I've got a bunch of different drive sizes that are hard to expand on without wasting space or spending a ton.
Probably splurge just a bit more for CMR hard drives in my ZFS setup. I've had some pretty scary moments in my current setup.
Getting a better rack. My 60cm deep rack with a bunch of rack shelves and no cable management is not very pretty and moving servers around is pretty hard.
Hardwarewise I'm mostly fine with it, although I would use a platform with IPMI instead of AM4 for my hypervisor.
I built a compact nas. While it's enough for the drives I need, even for upgrades, I only have 1 pcie x4 slot. Which is becoming a bit limiting. I didn't think i'd have a need for for either a tape drive or a graphics card, and I have some things I want to do that require both. Well, I can only do one unless I get a different motherboard and case. Which means i'm basically doing a new build and I don't want to do either of the projects I had in mind enough to bother with that.
I would go smaller with lower power hardware. I currently have Proxmox running on an r530 for my VMs, plus an external NAS for all my storage. I feel like I could run a few 7050 micro's together with proxmox and downsize my NAS to use less but higher density disks.
Also, having a 42U rack makes me want to fill it up with UPS's and lots of backup options that could be simplified if I took the time to not frankenstein my solutions in there. But, here we are...
Would've used NixOS
Run the cables more neatly.
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