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RAID array filesystem recommendations (sopuli.xyz)

submitted 4 days ago by [email protected] to c/[email protected]

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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] 5 points 4 days ago

BTRFS has RAID built into the file system - instead of using MD you use BTRFS profiles which tell the system how to handle data.

For instance

file system data (critical for the file system to function): raid1c3 which means 3 copies of core P file system data on 3 different devices
user data: raid1 (so duplicating all your data on two different devices)

With this set up you could lose one device (of n, the total doesn’t matter), and not lose any data, and still be able to boot to recover with too much hassle.

BTRFS does block checksums, can scan for bit rot and recover from it, and generally tries to make your data safe. It technically supports raid5/6 for user data, the issue is around unclean shutdowns and a potential write hole where you could lose data, but if your system has a UPS backup and is on a relatively recent kernel it’s not any more dangerous than MD raid5/6 as I understand it.