Suggestion for a new server\nas build

The two requirements that seem to be critical are "low cost" and "production environment". With those things noted, building a server yourself, on the cheap, may not be the best idea. When something is purpose built, server components are tested extensively "together". You get the benefit of someone else's work on the bench.
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I bought a Lenovo Think Server (TS 140) new from Amazon for about $250 delivered, an i3, with 8GB ECC, no OS and no hard drive. ((It was a special. They seem to have gone up a bit.)) I bought another 4GB stick of ECC on Ebay, for $20, for a total of 12GB. The TS 140 has easy physical accommodation for 3 drives, with a 4th drive possible, using a 2.5 or 3.5 to 5.25 adapter in an empty 5.25" bay. (No hot swap) It has 5 sata ports. On a side note for office use, this server is the quietest PC I've ever owned.

Alternately, you can find deals for server refurb's, on Ebay, bargain basement. Here's an example -> Dell Server for under $170 delivered. 24GB ram, 2 each quad core Xeons (you can check here for the equivalent CPU speed CPU PassMark. It would have very good performance - far more than enough for OMV and 5 or 6 users.) Six sas/sata compatible 2.5" bays, that hot swap. 4 each GB Ethernet interfaces. There's nothing not to like.
(My only reservation with the item in the link is, they don't supply drive trays. Since that's a brand specific item, that might be hard to find, I'd probably look for a like item that includes them.)

Since you're looking for a server, for a business, I would go for a purpose built server versus building one.
(That's just my opinion.)
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On your boot drive and using an M2 SSD.
Realize that the only gain an SSD gives you, in a server environment, is the speed of boot up.
With that said, OMV was built to be lean so boot times are fast using ANY media.
(I'm booting from a USB 3.0 thumb drive and from power on to the availablity of the WEB GUI logon screen is about 45 seconds.) Second, how often does a server boot? Once a week, once a month?
Third after OMV boots, with most of its processes loaded into and running from ram, the speed of the OS drive has nearly zero impact on server performance.
Lastly, using a USB 3.0 port to boot saves a sata port for another data drive.

In my case, I prefer USB drives because they're easy to clone and they're external to the box so, in the event of a failure (that has yet to happen), I can swap out the boot drive with a clone and be back up in, literally, a minute.
(If you go this route, make sure you install the flash memory plugin.)

Again these are just my thoughts.
Good Luck.

Zitat von flmaxey

Alternately, you can find deals for server refurb's, on Ebay, bargain basement. Here's an example -> Dell Server for under $170 delivered. /--------------------/(My only reservation with the item in the link is, they don't supply drive trays. Since that's a brand specific item, that might be hard to find, I'd probably look for a like item that includes them.)

I searched E-bay for "Dell PowerEdge 610 drive trays" and found plenty for $4 or $7 each. While it can add up, relatively speaking, that's nickles and dimes. The Dell R710 takes 3.5" drives, BTW. (Versus the R610 and 2.5" drives.) You'd also have to pop $11 or so for a DVD player, if you wanted one. You get the idea...

Zitat von Wek

The only reason I went for a m2 ssd, is because I don't want to occupy a sata port for the os, and I read lot of threads here that discourage to use usbs as system disk, I guess for reading\writing process wearing the usb fast as hell, moreover I have laying around some m2 ssd that I don't have use for, so that would be no problem.

On booting from USB (or other flash devices) without the flashmemory plugin:

Yep, you'd burn through the max number of a flash devices write cycles in a hurry. (Many of those threads you were reading from the time before the flashmemory plugin was available.)

With the flashmemory plugin, where unnecessary writes to the boot drive are eliminated, USB drives last nicely. If they have wear leveling (the name brands do, San-Disk, PNY, etc.) and if they're somewhat large (16GB and up) they're going to do fine. On the other hand, any add-on server app that's installed on OMV should be forced to write to its' logs, metadata, etc., to a data disk, NOT the USB boot drive.

In my ritual / routine:
I configure OMV the way I want it, fully test it, etc. I clone the original USB drive (2x), where the original becomes the master. (It goes in a drawer and becomes a fall back if all else fails.) The two clones become the daily wear and tear drives. One may get package updates where I'll wait a few days, to be sure there are no ill effects, before updating the 2nd clone. That allows me to quickly and gracefully back out, if there's a problem.
I've been doing this awhile now, without a failure. If there was a failure, I wouldn't be concerned because recovery takes, literally, a minute. Simply pull the failed drive and plug in a tested and working backup clone, which inserts into a port on the "outside" of the case. Easy.

In any case, the Gen 10 you're looking at has 6 sata ports, 4 of which are usable for hard drives. I imagine you could find a way to plug your SSD as a boot drive, into one of the 2 unused ports, and tuck in there with a cable or something.