Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I used to use mdadm, but ZFS mirrors (equivalent to RAID1) are quite nice. ZFS automatically stores checksums. If some data is corrupted on one drive (meaning the checksum doesn't match), it automatically fixes it for you by getting the data off the mirror drive and overwriting the corrupted data. The read will only fail if the data is corrupted on both drives. This helps with bitrot.
ZFS has raidz1 and raidz2 which use one or two disks for parity, which also has the same advantages. I've only got two 20TB drives in my NAS though, so a mirror is fine.
If I were to redo things today I would probably go with ZFS as well. It seems to be pretty robust and stable. In particular the flexibility in drive sizes when doing RAID. I've been bitten with mdadm by two drives of the "same size" that were off by a few blocks...