Btrfs is a new copy on write filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration. Initially developed by Oracle, Btrfs is licensed under the GPL and open for contribution from anyone.

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3
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285 views

btrfs two Data sections and enospc error when trying to convert

I currently have a btrfs filesystem setup like this: # btrfs fi df /storage/ Data, RAID1: total=2.33TiB, used=2.32TiB Data, RAID0: total=2.00GiB, used=2.00GiB System, RAID1: total=32.00MiB, ...
6
votes
1answer
1k views

Ubuntu 14.04 bad taint on XFS and BTRFS

I've done a fresh install of Ubuntu 14.04 on a physical machine and a virtual machine and after the first reboot (and also at random times) on the screen I get a bad taint message for XFS and BTRFS ...
2
votes
3answers
2k views

Ubuntu thinks btrfs disk is full but its not

cat /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> UUID=a168d1ac-4e13-4643-976d-6e47ea1732b1 /boot ext2 defaults ...
1
vote
0answers
431 views

Strange output of btrfs fi df after converting from RAID0 to RAID1

I just converted my 3 disk btrfs filesystem from RAID0 to RAID1 and balanced it. At first the data was all in the RAID0 filesystem, so running btrfs filesystem df showed something like this: (XX are ...
1
vote
0answers
345 views

Installing and booting Lubuntu on ReadyNAS with Btrfs

I have NetGear ReadyNAS Business Pro with 6 Place for 6 Disks I did a hack the box (basically it is a normal PC with Intel CPU) I upgraded the CPU and I used the ReadyNAS OS 6 (which is Debian ...
1
vote
0answers
162 views

Open multiple LUKS partitions at boot

I have a setup where I have 4 LUKS partitions that need to be mounted at boot time in order to assemble a RAID10 btrfs partition holding the root partition of my system. I was able to finalize the ...
0
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0answers
402 views

How to install ubuntu to a already encrypted partiton without formatting it in 14.04

Ubuntu killed the alternative installer buuuuuuh!! I am not sure but I think this was possible before with it. As far as I understand it the installer actually recreates a encrypted volume even if ...
0
votes
1answer
1k views

Installing 14.04 Server to exisiting btrfs subvolume

I have an existing btrfs raid1 volume consisting of 4 disks. This already contains a few subvolumes of which I'm looking to install Ubuntu to one of. I've done the following: mount -o subvolid=0 ...
1
vote
2answers
270 views

Reflink cloning of LXC container on btrfs?

I use btrfs on my system and have created an LXC container with Xubuntu on it. Now I'd like to use that as a base for other containers. Since it's a btrfs, I can use cp --reflink to create a ...
0
votes
0answers
516 views

btrFS RAID5/6 Understanding space usage and usability

Im currently thinking about experimenting with btrfs with my workload in place of ext4. Right now I have a few drives on order. I want to setup btrfs on the first drive and slowly expand the FS ...
0
votes
0answers
404 views

Problem with booting Ubuntu 14.04 from a btrfs partition

I have installed Windows 8.1 Update 1. After that I have installed Ubuntu 14.04 on a btrfs partition. However, after the restart there was no GRUB menu to choose from and the system booted directly to ...
2
votes
1answer
1k views

Can't delete a btrfs snapshot

I can not delete the "apt-snapshot-release-upgrade-saucy-2013-10-19_00:52:26" btrfs snapshot. Here are the details: root@cioco:~# btrfs subvolume list -s / ID 261 gen 246 cgen 245 top level 5 otime ...
0
votes
0answers
22 views

Got a corrupt BTRFS partition, but is still usable, how to convert it to ext4? [duplicate]

I've got a corrupt btrfs partition, and also because of its low speed, I am thinking of 'converting' it to ext4, how can I convert a root partition from btrfs to ext4 without loosing the ability to ...
0
votes
0answers
138 views

Any chance of installing Ubuntu on existing bcache device formatted with btrfs?

I setup my system with btrfs as root file system to be able to install additional Linux systems later on (each with separate and small /boot partition) on separate subvolumes. Then I light-heartedly ...
0
votes
1answer
775 views

btrfs - did I just turn RAID1 into RAID10?

I set up a btrfs partition using two 3 TB drives in RAID 1: $ mkfs.btrfs -m raid1 -d raid1 /dev/sdd /dev/sde $ mount /dev/sdd /media/media Copied a bunch of data onto the partition, with the ...
2
votes
1answer
499 views

Is there a way to install 13.10 on btrfs and full disk encryption?

I like the fact that the default desktop Ubuntu installer only requires me to check a single checkbox in order to have a fully encrypted disk in the end (which is a requirement within our company, so ...
3
votes
1answer
1k views

Error on mounting BTRFS volume on Precise

I use a 12.04 (Precise) fully updated (kernel 3.2.0-58-generic x86_64). In other partitions, I installed the Ubuntu 14.04 Trusty (Alpha version) to try out. I can't boot into the Trusty system any ...
1
vote
1answer
148 views

Ubuntu server with btrfs root and confusion with the @ symbol in subvolume path

Please note the following commands: user@ubuntu:~$ sudo btrfs subvolume create /srv/audio Create subvolume '/srv/audio' user@ubuntu:~$ sudo btrfs fi show Label: 'BTRFS_STORAGE' uuid: ...
6
votes
2answers
15k views

Which is better for a home media server: zfs or btrfs or LVM/md? [closed]

I'm looking at building a new home server and would like a flexible filesystem. Both btrfs and zfs are interesting. I want to be able to do soft raid and have flexible solution allowing me to expand ...
0
votes
0answers
251 views

Grub in 13.10 doesn't notice a btrfs root?

I'm using Ubuntu 13.10 (saucy) as my primary system and installed a daily version of trusty in a btrfs partition. For some reason my grub from 13.10 can't find that partition, even though it finds a ...
0
votes
2answers
264 views

Exclude hidden directories from subvolume/snapshot

I am using snapshots for backing up data of my @home subvolume. But I would like to backup the real important data (like all my files, which are in @home, but not hidden directories because I am not ...
6
votes
4answers
2k views

How stable is BTRFS in Ubuntu?

I see entries describing BTRFS on Ubuntu 12.04 has some concerns due mostly to the maturity of the BTRFS product. Now that we have 13.10 available, is the BTRFS file system reliable?
34
votes
5answers
3k views

How can I flip a single bit in a file?

I want to intentionally damage a file in order to test the claims that btrfs can heal itself. The article talks about taking the filesystem off, damaging a photo by "flipping" a single bit and then ...
2
votes
2answers
3k views

How to create an external selfhealing btrfs USB HDD RAID 1 array?

The hardware is an external 2TB bus powered USB disk. What I want is a RAID1 setup of 2x 1TB btrfs. Is this possible? How? __ Motivation The motivation for me to use RAID1 btrfs is because I ...
0
votes
2answers
132 views

Will Ubuntu 13.10 boot if I enable compression on / which is a btrfs volume

I installed Ubuntu 13.10 on btrfs and the installer created the following fstab: UUID=0eff8daf-5924-4a1f-922c-ec82ec594dc0 / btrfs defaults,subvol=@ 0 0 ...
0
votes
1answer
335 views

How to mount Btrfs with “errors=remount-ro” equivalent?

Btrfs does not appear to support errors=remount-ro. In /etc/fstab, what option can I use with Btrfs to achieve equivalent result as "errors=remount-ro"?
0
votes
1answer
305 views

btrfs mount options not working

I'm running Ubuntu 12.04.3 LTS I converted my data drives with btrfs. I first did apt-get update before installing btrfs-tools. Unfortunately, that still only installed version 0.19 I can mount the ...
4
votes
4answers
323 views

My approach for replacing current Ubuntu with newer

I'm working on Ubuntu 13.04 currently. I want to replace it with Ubuntu 13.10. For the same, please approve whether my approach mentioned below is right! I have created a bootable usb stick having ...
2
votes
2answers
631 views

Can I have two distros on the same partition using btrfs?

I'm using btrfs successfully and have luckily separate home and system partitions. Using Ubuntu 13.10 and wanting to test 14.04, how can I do this using the btrfs file system? The system has an EFI ...
0
votes
2answers
770 views

Using btrfs with bcache on /

I am using btrfs with bcache for / on Ubuntu 13.10. It's fast. Unfortunately, during normal boots the step "Scanning for btrfs filesystems" fails. To successfully boot I have to enter recovery mode ...
2
votes
1answer
142 views

Missing 50GB on my 100Gb harddrive

I have a 128GB harddrive formatted with the btrfs. However, for some reason I'm missing around half of the disk space. Do any of you have any idea of how to fix it? See this screenshot for details ...
0
votes
1answer
1k views

Installing Ubuntu on btrfs over multiple drives

When I installed Ubuntu 13.04, I managed to combine a couple of outdated askubuntu answers, as well as some of the btrfs documentation in order to figure out how to install Ubuntu over two SSDs using ...
0
votes
1answer
550 views

Boot existing ubuntu installation on uefi, GPT BTRFS

I have looked through many of the questions, and haven't found anything that quite satisfies this problem. I have an ssd hard drive that is bootable from my old computer. It is a standard BIOS, ...
2
votes
2answers
1k views

How can I install Ubuntu Saucy Server with BTRFS?

So, a week ago I installed the latest beta version of Ubuntu Saucy Server in a MacMini using BTRFS as only partition to mount / on it (I know it's not recommended to do this, but it's not the point ...
2
votes
2answers
987 views

Does btrfs support per user quota?

If I move the /home/... folders to a btrfs partition, can I still enable per user quota? That is, each user should be able to use a limited amount of storage.
0
votes
0answers
28 views

Btrfs fsck running on boot every time? [duplicate]

I've read some stuff that says that Btrfs fsck is run every time on bootup. Is this still true? If so how can you tell when it runs or does not run on bootup? I just installed Ubuntu Raring Ringtail ...
0
votes
1answer
413 views

Use IOzone to check read/write performance of ext4 and btrfs?

Can someone help me to use IOzone filesystem benchmark tool on Ubuntu to check the performance of ext4 and btrfs filesystems? I have installed Ubuntu into a VM.
3
votes
2answers
4k views

Creating btrfs subvolume like @ or @home

Being intrigued by btrfs I decided to toy around with it in a VM. Installation works great as long as I remember to put /boot on a separate partition and it all seems to work fine. What I would like ...
1
vote
1answer
2k views

Moving a subvolume to another drive

I'm trying to move my root subvolume to another drive. I've booted into a live disc, ran "cp -a /mnt/sdb/@ /mnt/sda", fixed my FSTAB, and reinstalled grub. However when I boot up I can see that both ...
3
votes
1answer
453 views

Are btrfs updates rolled in to 12.04 LTS (3.2) kernels?

Many BTRFS bug fixes and updates are being applied to the 3.10 Kernel by the filesystem maintainers - is Ubuntu actively pushing those fixes and updates down to their current LTS kernel (3.2.0-X)? ...
3
votes
0answers
307 views

Can't mount btrfs on boot [duplicate]

I have a server running Ubuntu 12.04 (with a 3.8.13 kernel) that fails to boot if I include in /etc/fstab a mount point for a btrfs volume: /dev/sda3 /home btrfs ...
0
votes
1answer
101 views

“btrfs filesystem show” gives me “failed to read” errors

My /home is a raid1 btrfs partition spanning two disk. As far as I can tell, it's working fine. This morning I wanted to check the status of the partition so I entered the btrfs filesystem show ...
2
votes
1answer
3k views

btrfs: not enough free disk space, but device not fully used

I'm using btrfs for my home directory, which spans multiple devices. In total I should have around 7.3TB of space - and that's what df shows, but I ran out of space after using only 5.7TB of data: # ...
7
votes
2answers
2k views

ext4 to btrfs conversion: how long can it take? space requirements?

I started btrfs-convert for my ext4 partitioned hdd. I did a fsck first which was fine. So since it is running over 4 hours now (1.) I wonder if it will ever finish ? I read multiple articles ...
1
vote
1answer
796 views

Cannot use 'btrfs balance' to convert to raid1

I'm trying to convert a 2 drive btrfs array on Ubuntu 12.04 to use RAID1. Following the instructions on the btrfs wiki I've tried this command, with no success: valorin@gimli:~$ sudo btrfs filesystem ...
4
votes
1answer
1k views

Filesystem Label Rename

I'm getting a strange error quark 11 on renaming my filesystems on Ubuntu 12.10 64. I'm sure 100% I've already done it in the past without issues using the disk utility. Maybe some recent upgrade or I ...
0
votes
2answers
452 views

Why does Ubuntu create a @home directory on home partition?

I want several Linux distros to share the same home/data partition, each having a unique user name and implicitly a separate home directory. I installed Debian Wheezy, and formatted this partition as ...
3
votes
1answer
110 views

Is there anything to remember when I exchange my /?

I have a laptop computer with the following setup: / on a btrfs /dev/sda3 subvolume @ /home on a btrfs /dev/sda3 subvolume @home /boot on an ext4 /dev/sda2 /boot/efi on a vfat /dev/sda1 no swap /tmp ...
3
votes
1answer
1k views

How do I show the current amount of fragmentation on a btrfs filesystem

Wiki pages for btrfs and other how-tos talk about online defragmentation and other related topics but they don't say how to find out how fragmented a file system is. Is there a method to determine how ...
0
votes
1answer
300 views

Can I Recover The Files in the Directory /usr from a btrfs Snapshot?

Some time ago, I moved the folder /usr to its own partition. Before this it had lived in the / partition which has a btrfs filesystem. Accidentally, I formatted my /usr partition from my Windows XP ...