Hi, On Sun, May 06, 2012 at 02:11:58PM +0200, Steven Post wrote: > On Sun, 2012-05-06 at 13:51 +0900, Osamu Aoki wrote: > > Hi, > > > > On Sat, May 05, 2012 at 01:24:59AM +0200, Steven Post wrote: > > > Hello list, > > > > > > I'm testing out a new system, the idea is to combine 6 hard drives into > > > a single btrfs volume (raid10) (using subvolumes for /, /home, etc). I > > > understand that it is now possible to also have /boot on btrfs > > > (previously impossible because of GRUB). > > > > I tried to install sysyem with much simpler configuration: > > / : a single btrfs on a partition /dev/sda1 > > swap: a single swap on a separate partition /dev/sda2 > > > > It did not work due to missing fsck.btrfs in btrfs-tools. > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=668832 > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567681 > > I've had the same problem, but I was aware of it from an earlier attempt > using virtualbox and a separate ext4 /boot partition. This can be solved > by changing /etc/fstab (booting from a live cd), look for the line with > the btrfs system, then change last number on that line to a '0' (the > 'pass' column).
Yah, that's one way. My bug report cited another work around. > > > Unfortunately the Debian installer (daily build for wheezy) is unable to > > > create multi-device btrfs volumes. > > > > Yah.. but you probably can do this via shell screen. > > I don't think I'm able to do that from the rescue mode shell without > using an existing installation, without the existing installation I get > a 'Command not found' error on 'btrfs device scan', I assume this > includes the whole btrfs command. It is easiest to do it using an existing installation. Well... I see btrfs-tools-udeb package. If you install via expermode, you may be able to chose to install btrfs-tools-udeb via menu. Otherwise, install such packages via wget and dpkg to rescue system provided you have enough memory > > > I tried the a normal install and then copy it over to a multi-device > > > btrfs system, afterwards adding the remaining disk: > > > 1) using a single drive to install using ext4 for /boot and btrfs for / > > > 2) after (successful) installation boot from a live cd (ubuntu 12.04 in > > > this case, but it shouldn't really matter) > > > > How successful? Did it boot? > > It boots, yes, but you still need to change /etc/fstab using a live cd > because of the missing fsck tool. Yes that is a start. I usually do this while installing with d-i CD in advance (or in rescure mode later which is essentially a live cd) > > > 3) create partitions for btrfs on the other 5 drives using gdisk > > > 4) create a multi-device btrfs filesystem with those partitions, with a > > > subvolume for the root filesystem and for /home > > > 5) copy all the data from the first disk to the new btrfs volume > > > 6) chroot into the rootfs of the new volume, after mounting (-o > > > bind) /dev, /proc and /sys into the mounted system > > > 7) change fstab for the new drives and modify /etc/default/grub > > > 8) run update-grub: this is where things start falling down, I get an > > > error about / not being mounted so grub fails. > > > > > > This is apparently caused by a regression in GRUB [1] (Debian bug > > > #538118). > > > > Well this is possibly another problem you are facing. Basically, you > > should know what file to change imanually when copying files from one > > partition to another. So this is really an expert trick which d-i > > currently does not support for ordinry uses. But as I mention in the > > above, most simple installation suffer major breakage for btrfs on > > wheezy even if you manually adjust configuration files. > > > > I'll have another look if my other attempts from within the d-i fails. > > Another thing I noticed during my tests is that the installer will > recognize existing btrfs partitions and is able to use them, except when > dealing with a multi-device file system. Using rescue mode you can trick > d-i into using them properly by executing a shel in an existing > installation, then issuing a btrfs device scan. Once the scan is done, This is my wild guess. btrfs support of d-i is not so mature yet. > you can exit the shell and go back to the partitioner. There I could > select a device (partition) from the btrfs system and use it as /, now > the mount works with the multi-device partition. > Perhaps d-i should issue the 'btrfs device scan' command when starting > the partitioner? I think with skill and knowledge you presented, if you are successful doing this with help of shell etc., you should present specific procedure needed to do this to d-i BTS as wishlist bug. That should get it supported smoothly for upcoming release. > Kind regards, > Steven Osamu -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120506133012.GA15043@localhost