On 2015-10-19 23:13, james harvey wrote:
Before I go any further, I would like to point out that most traditional hardware RAID controllers only support two disks for RAID-1 configurations, and the only one I've seen that doesn't does RAID-1 like BTRFS (two copies total of each block). The whole 'RAID-1 on n disks is n copies' thing actually started with Linux's MD-RAID subsystem, and just happens to have been popular enough that other software RAID implementations adopted those semantics as well.Wanted to see if there's active development on N-Way (traditional) RAID-1.By this, I mean that RAID-1 across "n" disks traditionally means "n" copies of data, but btrfs currently implements RAID-1 as "2" copies of data. So, unlike traditional RAID-1, losing 2 drives in a many drive array might cause data loss. It's been mentioned before that N-Way (traditional) RAID-1 should eventually be implemented through btrfs.
OK, with that historical rant out of the way, back to your actual question: Based on what has been said in the past, N-way replication is planned for development after the raid56 code is considered stable. Based on that and past experience, I'd say to expect it no sooner than 4.8, or if we're _really_ lucky, 4.7. On top of that, based on past experience with BTRFS\, I would not suggest actually trying it for anything other than testing until at least one release after the initial release.
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