Jeremi Piotrowski <jeremi.piotrowski <at> gmail.com> writes: > In general I have not had any problems setting up similar gentoo systems > running pure btrfs in raid1/single mode. Those systems, however, all have > initramfs' - not that that's a bad thing but see above.
I too am also interested in booting a btrfs-raid1 all btrfs file system based gentoo, without an interramfs. Some discussions I've read seem to indicate this has occurred already; so maybe it's just a situation where the knowledge and tricks just need to be disseminated more clearly. > Btw. testing the mentioned patch turned out to be a 5 minute thing. > qemu-img create to make 2 disk images, qemu boot sysresuecd, create 2 > device btrfs volume, mount, unpack stage3 and shutdown. Patch spare kernel > in host, compile and boot passing the kernel and cmdline from outside the > guest. Works nicely for quick testing (forgot to set root passwd? who > cares, it boots!). Here [1] on the Btrfs 'gotchas' page are some interesting and related problems described in some detail. Also in the kernel pages [2] hint at issues with file systems that may be related; but more digging will is needed. I hope a documented solution is verified and integrated into Rich's btrfs, raid-1 install notes: [3] . The 'printk' comments are very similar to how and why 'netconsole' was used to diagnose booting issues with the kernel, hardware, fs etc etc [4]. This use of netconsole to perform a 'fine grained debug' of the kernel boot processes is something I hope to figure out and put into an automated gentoo installer as a integral part of the installation semantics, for gentoo. All you need is the system's ethernet port up and a second system to receive the (printk) data stream. hth, James [1] https://btrfs.wiki.kernel.org/index.php/Gotchas [2] http://kernelnewbies.org/Linux_4.0#head-6e2ee9e5b7cfdb480861fda324a804734dc14f89 [3] https://docs.google.com/document/ d/1VJlJyYLTZScta9a81xgKOIBjYsG3_VfxxmUSxG23Uxg/edit?pli=1 [4] https://www.kernel.org/doc/Documentation/networking/netconsole.txt
