this post was submitted on 10 Nov 2024
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I am planning on creating a home server with either 2 (RAID1) or 3 (RAID5) HDDs as bulk storage and 1 SSD as bcache.

The question is, what file system should I use for the HDDs? I am thinking of ext4 or xfs, as I heard btrfs is not recommended for my use case for some reason.

Do you all have some advice to give on what file system to use, as well as some other tips?

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[–] [email protected] 1 points 2 weeks ago (4 children)

The BTRFS thing is cutting the power or losing the disks in the middle of a write which corrupts your data. If you don't think that will be a problem then BTRFS is fine. I recommend ZFS personally, but it sounds like you want to use mdadm instead so basically anything will work.

If you might need to shrink your filesystem later then avoid XFS. EXT4 is relatively featureless but ol' reliable. ZFS is good for long term data integrity and protection. BTRFS is similar to ZFS. BcacheFS is new but like a swirl of EXT4 and BTRFS. Just pick the one with the features you want.

[–] [email protected] 3 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

Powerloss might happen as I don't have a ups.

And when it comes to mdadm, it just happens to be the first and only redundancy tool I know. I am however open to learn and try new things.

ZFS seems interesting, but: I read that ZFS would require quite a lot of RAM, and I was going for 32 GBs only, would it be enough?

[–] KaninchenSpeed 1 points 2 weeks ago* (last edited 2 weeks ago)

ZFS doesn't require lots of RAM, more RAM just improves the caching (ARC) it can do. You can set ZFS to use all unused RAM as ARC, so it doesn't interfere with other services running on the same PC. I ran ZFS with lots of VMs on an old office PC with 16GB RAM and it was still able to max out a 10gig nic.

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