Hi I'm trying to figure out what a six drive btrfs raid10 would look like. The example at <https://btrfs.wiki.kernel.org/index.php/FAQ#What_are_the_differences_among_MD-RAID_.2F_device_mapper_.2F_btrfs_raid.3F> seems ambiguous to me. It could mean that stripes are split over two raid1 sets of three devices each. The sentence "Every stripe is split across to exactly 2 RAID-1 sets" would lead me to believe this. However, earlier it says for raid0 that "stripe[s are] split across as many devices as possible". Which for six drives would be: stripes are split over three raid1 sets of two devices each. Can anyone enlighten me as to which is correct? Reason I'm asking is that I'm deciding on a suitable raid level for a new DIY NAS box. I'd rather not use btrfs raid6 (for now). The first alternative I thought of was raid10. Later I learned how btrfs raid1 works and figured it might be better suited for my use case: Striping the data over multiple raid1 sets doesn't really help, as transfer from/to my box will be limited by gigabit ethernet anyway, and a single drive can saturate that. Thoughts on this would also be appreciated. As a bonus I was wondering how btrfs raid1 are layed out in general, in particular with even and odd numbers of drives. A pair is trivial. For three drives I think a "ring setup" with each drive sharing half of its data with another drive. But how is it with four drives – are they organized as two pairs, or four-way, or … Cheers, boli-- 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
