Hi, Just getting started with btrfs. I understand that btrfs stores data/metadata in two different tree structures – one for file/directory names, and one for data blocks. Reading @, http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices Use raid10 for both data and metadata mkfs.btrfs -m raid10 -d raid10 /dev/sdb /dev/sdc /dev/sdd /dev/sde and @, "Churning Butter(FS): An Interview with Chris Mason" http://www.linux-mag.com/id/7329 CM Today you can do this: mkfs.btrfs -m raid1 -d raid10 /dev/sda /dev/sdb /dev/sdc /dev/sdd And you’ll get metadata on raid1 and data on raid10. The raid10 will use all four drives and the raid1 will use two drives at a time. Yes, btrfs allows you to pick different values for data or metadata. The fact that I *can* setup data & metadata differently is clear. But I'm not at all clear *why* I'd want to, or what the advantages are. I'd guess it's a balance/combination of performance & resiliency. Naively "-m raid10 -d raid10" seems to make the most sense -- if i have it, use it. Are there any benchmarks, guidelines or recommendations? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
