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Is RAID1 over USB Reliable? (infosec.pub)
submitted 5 months ago by [email protected] to c/[email protected]
16 comments fedilink hide all child comments
 

I have an 11th gen Framework mainboard which I would like to repurpose as a server. Unfortunately, (unless I do some super janky stuff) I can only connect 1 drive to it over M.2 and any additional ones must be over USB.

I am thinking of just using some portable hard drives and plugging them in over USB. I plan to RAID1 them and use them as boot drives and data storage, and use the M.2 slot for something unrelated.

In your experiences, is USB reliable enough nowadays to run a RAID array for a server like this? If it is, does it depend on the specific drive used?

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[–] [email protected] 2 points 5 months ago* (last edited 5 months ago)

Well, nothing is reliable over USB type A. If you don't want to DIY you can get a USB JBOD with type-c like this one or that one or this cheaper one. They'll get the job done for a price. :)

However, there are easy ways to get reliable SATA ports from m2 slots that your framework has. NVME to 6 SATA ports: https://www.aliexpress.com/item/1005004263885851.html

To power the disks you can use ANY standard ATX power supply (get something brand-gold second hand for 20$). To make sure the PSU stays ON, just plug a wire between the green and any black wire.

Another option for power is to get a cheap 12V power supply and a step down DC/DC to provide 5V. If you don't have it a SATA cable like this is helpful. Simply cut the white plug and attach the red cable (5v) to the output of the DC/DC and the yellow one (12V) directly to the power supply.

There's also these dual output power supplies that you can regulate to 12v+5v but frankly I would just go for the option above as it will be safer.

Make sure you check every voltage and polarity before plugging anything into your power supply!!

[–] [email protected] 1 points 5 months ago (2 children)

In my experience, noooooo.

I've had too many momentary disconnects with USB devices to trust that on a 24/7 server.

An early server I built had a large USB backup drive for a RAID5 array and every month there was usually something that went wrong.

[–] [email protected] 1 points 5 months ago (1 children)

I've been doing USB with raid on several servers for 10 years. No random disconnects.

[–] [email protected] 0 points 5 months ago (1 children)

Why though?

[–] [email protected] 0 points 5 months ago (1 children)

Because I have a total of 28 drives and it works really well and is flexible.

12 of them are in a Synology though

[–] [email protected] -1 points 5 months ago

Sata extension cards aren't expensive you should know.

[–] [email protected] 0 points 5 months ago (1 children)

Agreed. You’re at the mercy of your USB controllers as well as southbridge in that case.

You’re adding more things that can go wrong.

Generally HBA/RAID cards are usually built for enterprise rather than consumer so they’re usually more reliable as well.

[–] [email protected] 1 points 5 months ago

Today's CPUs usually expose some USB connections directly. Ryzen 7000 desktop CPUs expose 4 USB 3.2 Gen 2 directly on their on-package I/O die for example. So if you connect your USB drives directly to the ports your mainboard connects directly to the CPU, the chipset ("southbridge") and any third-party USB controllers are out of the equation.

This is just information, I'm not advising to use USB for fixed storage.

[–] [email protected] 1 points 5 months ago* (last edited 5 months ago)

I plan to RAID1 them and use them as boot drives

This will not work unless the mainboard is handling the RAID control in firmware. If you are doing software RAID then the OS must boot before the array can be accessed.

If you just want to set up a NAS, you can get a used PowerEdge tower for very little money, and it will work a lot better than what you have planned.

[–] [email protected] -1 points 5 months ago

You are quite likely to regret going down this route. Should do what you have to to get the drives properly connected.

[–] [email protected] -1 points 5 months ago (3 children)

No. USB is not designed to be reliable. It's designed to be plug and play. Don't plug and play with your data.

[–] [email protected] 1 points 5 months ago

Plug and play means you don't have to fiddle with drivers or IRQs or whatever.

[–] [email protected] 1 points 5 months ago

That sentence does not make any sense whatsoever. SATA and SAS are hot pluggable as well.

[–] [email protected] 0 points 5 months ago (1 children)

Plug and play alone is not the reason. Nvme is plug and play.

[–] [email protected] 1 points 5 months ago

Plug and play is not any reason at all.

[–] [email protected] -1 points 5 months ago

USB-storage isn't reliable.

Period.

ANY fscking thing that bumps any connection, can break the dam link.

Then your kernel can re-label the device when it re-connects,

and you've got to reassemble your RAID.

just my experience.

use ANY other method you can, other than USB.

stick a SATA adaptor on there somewhere, if you can.

Get a different motherboard.

ANYthing, but not USB.