On Wed, Dec 9, 2015 at 10:28 AM, David Hampton <mailingli...@dhampton.net> wrote: > On Wed, 2015-12-09 at 16:48 +0000, Duncan wrote: >> David Hampton posted on Wed, 09 Dec 2015 01:30:09 -0500 as excerpted: >> >> > Seems I need to upgrade my tools. That command was added in 3.18 and I >> > only have the 3.12 tools. >> >> Definitely so, especially because you're running raid6, which wasn't >> stable until 4.1 for both kernel and userspace. 3.12? I guess it did >> have the very basic raid56 support, but it's definitely nothing I'd >> trust, at that old not for btrfs in general, but FOR SURE not raid56. > > I've upgraded to the 4.2.0 kernel and the 4.0 btrfs-tools package.
I think btrfs-progs 4.0 has a mkfs bug in it (or was that 4.0.1?) Anyway, even that is still old in Btrfs terms. I think Ubuntu needs to do better than this, or just acknowledge Btrfs is not supported, don't include btrfs-progs at all by default, and stop making it an install time option. > These are the latest that Ubuntu has packaged for 15.10, and I've pulled > them into my 14.10 based release. Is this recent enough, or do I need > to try the 4.3 kernel/tools build from the active development tree (that > will eventually become 16.04)? It's probably fine day to day, but if you ever were to need btrfs check or repair, you'd want the current version no matter what. There are just too many bug fixes and enhancements happening to not make that effort. You kinda have to understand that you're effectively testing Btrfs by using raid56. It is stabilizing, but it can hardly be called stable or even feature complete seeing as there are all sorts of missing failure notifications. More than anything else you need to be willing to lose everything on this volume, without further notice, i.e. you need a backup strategy that you're prepared to use without undue stress. If you can't do that, you need to look at another arrangement. Both LVM and mdadm raid6 + XFS are more stable. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
