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Seeking advice about BTRFS RAID (lemm.ee)

submitted 1 year ago by [email protected] to c/selfhosted

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Hi, I got a tiny Lenovo M720Q (i5-8400T / 8RAM / 128NVME / 1Tb 2,5" HDD) that I want to set as my home server with the ability to add 2 more drives (for RAID5 if possible) later using its two USB 3.1 Gen 2 (10gbps).

The OS (debian 12 + docker) will be exclusive to the nvme, I will mostly use 40/128GB of its capacity with no idea how to make use of the rest.
My data (medias, documents and ISO files) will resides on the HDD pool, while keeping a copy of my docs on my home pc.

I read a bit about BTRFS RAID I even experimented with it in a VM and it really got me interested in using it because of its flexibility of balancing between raid levels and the hot swapping of unequally sized drives in both stripped and mirrored arrays. However, most of what I read online predate kernel 6,2 (which improved BTRFS RAID56 reliability). So, Here I am asking if anyone here is using BTRFS RAID and if it is stable enough to use on a mostly idle server or should I stick with LVM instead. What good practices to do or bad ones to avoid?

Thank you.

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[–] [email protected] 3 points 1 year ago

The stability issues with RAID5 on BTRFS tend to be blown out of proportion. I've been using it for my home server with mixed drives of ~50TB raw for about 5 years without any issues. I use it for the same benefits you've noted, mainly support for ad hoc expansion while still maximizing usable space. Until bcachefs is released BTRFS is the only filesystem I've seen with these features.

That said, the mentioned stability issues, particularly the write hole, ARE real and possible. I wouldn't use it in a commercial production scenario or for data I couldn't stand to lose. Anything I care enough about has off-site backups, and my server runs on a UPS to mitigate issues from power outages. But for my purposes it's worth the minor risk for the benefits.