On Monday 26 April 2010 16:34:38 Boyd Stephen Smith Jr. wrote: > On Monday 26 April 2010 16:05:31 B. Alexander wrote: > > On Mon, Apr 26, 2010 at 2:22 PM, Boyd Stephen Smith Jr. < > > > > b...@iguanasuicide.net> wrote: > > > I'm also a current reiser3 user. I find the ability to shrink the > > > filesystem > > > to be something I am not willing to do without. > > > > You know, I said the same thing, but then as the kernel and GRUB and the > > like advanced, I noticed that my reiserfs partitions would have to replay > > the journal every time I rebooted, even after a clean shutdown. I started > > calculating how many times I shrunk any of my partitions in the last 8 > > years, and I can only recall twice. And since I have several terabytes > > around the house, I figure I can migrate data and delete/recreate > > partitions if I really need to reduce it. > > That doesn't seem right. I have been using reiser3 since 2005, and my > system does not require a journal replay if I do a clean shutdown/reboot. > A forced reboot through Alt+SysRq+B does trigger a journal replay (as it > should). > > I also have 4+ tebibytes but most of them are allocated to filesystems. > I've had to shrink filesystems dozens of times since 2005, during or after > a data move. > > I don't use partitions (much), having been using LVM happily for everything > except /boot. I'm hoping to be able to move that onto LVM once I move to > GRUB2 and GPT. > > > > I have not read the rest of the thread, but my off-the-cuff > > > recommendation would be to start migration to btrfs. Now that the > > > on-disk format has stabilized, I am going to start testing it for > > > filesystems other than /usr/local, /var, and /home. Assuming I can > > > keep those running well for 6-12 > > > months, I will migrate /usr/local, /var, and then /home, in that order, > > > with a > > > 1-3 month gap in between migrations. > > > > I might play with it for some non-critical partitions, or ones that I can > > mirror on an established filesystem, even if it is only to use in an > > "Archive Island" scenario, where I have a LV that I can mount, sync and > > umount. However, btrfs is not included in the kernel, is it? As I recall, > > nilfs2 has kernel support, but that was the only one of the new > > filesystems, at the time when I started looking at this. > > btrfs is included in 2.6.31.12-0.2-default in openSUSE 11.2. It is also > included in linux-image-2.6-686 and linux-image-2.6-amd64 for > lenny-backports, testing, and sid. I don't normally deal with other > architectures/distributions, so it might also be available there. > > > > I've already encountered an issue related to btrfs in my very isolated > > > deployments. The initramfs created by update-initramfs does not appear > > > to mount it properly. Instead I am given an '(initramfs)' prompt and I > > > have to > > > mount the filesystem manually (a simple two-argument mount command > > > suffices) > > > and continue the boot process. > > > > That is enough to give me pause... > > It doesn't appear to be a file system issue, but rather a problem with the > initramfs scripts. It could also be rooted in my configuration. I know > that my "root=" kernel parameter has to differ from the device name in my > /etc/fstab in order to get the initramfs to correctly initialize LVM.
I wanted to report that I was able to diagnose and solve this. The problem was that /lib/udev/vol_id in my initramfs could not identify a btrfs file system, which caused the scripts to try and mount the root file system using '-t unknown' as part of the command-line arguments. I upgraded initramfs-tools and udev to the Sid versions. This should cause a initramfs rebuild as part of the postinst, but if it doesn't do so on your system, be sure to run (update-initramfs -k all -u). Now my system boots unattended with a btrfs '/'. So, at this time, btrfs can be used for non-'/' file systems with the tools from lenny-backports. However, newer udev/initramfs-tools are required to boot with a btrfs '/'. I hope they are included in the Squeeze release. I have not, and probably will not test a btrfs '/boot'. I have also been encountering issues with suspend and resume on this new install. I don't currently believe these are btrfs-related, either, but fair warning. -- Boyd Stephen Smith Jr. ,= ,-_-. =. b...@iguanasuicide.net ((_/)o o(\_)) ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' http://iguanasuicide.net/ \_/
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