On Wed, 8 Jul 2015 07:39:40 AM Brian May wrote: > My understanding though (from what was said yesterday) is that BTRFS with > "RAID" support (currently) offers no guarantee that two copies of > everything will be on separate disks. So if one disk fails, you could loose > both copies of your data.
No, what happens with BTRFS RAID-1 is that you only get 2 copies of data on different device, no matter how many devices you have. So if you have a 3 drive RAID-1 using BTRFS then you will NOT have 3 identical mirrors; some data will be on device 0 & 1, some data will be on device 1 & 2 and some will be on device 0 & 2. https://btrfs.wiki.kernel.org/index.php/SysadminGuide#RAID_and_data_replication # With RAID-1 and RAID-10, only two copies of each byte of data are written, # regardless of how many block devices are actually in use on the filesystem. All the best, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC _______________________________________________ luv-main mailing list [email protected] http://lists.luv.asn.au/listinfo/luv-main
