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Software vs Hardware RAID (gehirneimer.de)

submitted 7 months ago by [email protected] to c/[email protected]

34 comments fedilink hide all child comments

I am thinking of extending my storage and I don't know if I should buy a JBOD (my current solution) or a RAID capable enclosure.

My "server" is just a small intel nuc with an 8th gen i3. I am happy with the performance, but that might be impacted by a bigger software RAID setup. My current storage setup is a 4-bay JBOD with 4TB drives in RAID 5. And I am thinking of going to 6 x 8TB drives with RAID 6 which will probably be more work for my little CPU

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[–] [email protected] 13 points 7 months ago (2 children)

Normally I would say software, or rather a raid-like filesystem like btrfs or ZFS. But in your specific case of funneleing it all through a single usb-c connection it is probably better to keep using an external box that handles it all internally.

That said, the CPU load of software raid it very small, so that isn't really something to be concerned with, but usb connections are quite unstable and not good for directly connecting drives in a raid.

[–] [email protected] 1 points 7 months ago

USB hub.

[–] [email protected] 2 points 7 months ago (1 children)

I mean I've been running the setup this way for >4 years and never had any problem with the USB connection, so I cannot attest to "usb connections are quite unstable"...

[–] [email protected] 6 points 7 months ago (2 children)

I supposed that is because the JBOD box was handling the raid internally so short connection issues are not that problematic and can be recovered from automatically. But that wouldn't be the case if you connected everything together with a usb hub and usb to sata adapters and run a software raid on that.

[–] [email protected] 2 points 7 months ago* (last edited 7 months ago)

I don't know usb c in thunderbolt has direct access to pcie lanes.

[–] [email protected] 1 points 7 months ago* (last edited 7 months ago)

I've been running a 4-disk RAIDz1 on USB for 4 years now with zero failures on one machine and one failure on another where it turned out the USB controller in one WD Elements was overheating. Adhering a small heatsink on it resolved the problem and it's been stable under load for 2 years now. The USB devices have to be decent. AMD's host controllers are okay. VIA hubs are okay. ASMedia USB-to-SATA are okay. I'm using some enclosures with ASMedia and some off-the-shelf WD Elements that also use ASMedia. It's likely easier to get a reliable system if installing disks internally as the PSU and interconnects are much more regulated and any would work well, whereas with USB you have to be careful in selecting decent components.