November 24, 2025Nov 24 Currently rocking 2x2TB of cache on BTRFS in Raid 1. Looking to add a third disk. And wondering what is recommended.Just adding a third drive to the pool. Changing the raid level. Or even changing to ZFS.Thoughts?
November 24, 2025Nov 24 Community Expert What is the explicit purpose of adding a 3rd disk to the existing pool?Adding a 3rd drive to a btrfs mirror is going to add 2TB usable space but any data written beyond 2TB worth of capacity will not be mirrored as the mirror can only support a total of 2TB given this specific drive configuration. IMO this is pretty useless setup.Changing to ZFS will allow you to use RAIDZ1 giving you 4TB of usable space (assuming you are adding an identical 2TB disk) and giving you protection on all 4TB in the event a single disk is lost. Edited November 24, 2025Nov 24 by MowMdown
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