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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Error removing an HDD from a RAID1 BTRFS array

I setup a btrfs filesystem on 3 disks with RAID 1. Somehow, a small portion (2GiB) got used as RAID0. At the time, no amount of running balance -dconvert raid1 would change it so I left it as is. ...
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btrfs - Need help understanding it correctly

After spending hours and hours i cannot manage to understand btrfs enough to use it the way i want. In the end my goal is simple: Having a clean fail-proof solution for os upgrades. So i've exactly 3 ...
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How to start services only after BTRFS filesystem has been mounted?

I've been trying to make some services only start after a BTRFS system gets mounted, with no success. I have the following in my service start/stop script: # Required-Start: $local_fs $remote_fs ...
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20 views

Is it safe to delete apt-snapshot-*?

I think I did a mistake when I decided to use Btrfs. I am not using any of its features, but now have troubles with not enough space. I did sudo btrfs balance start / -v as suggested in some ...
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37 views

Error “Unknown unclaimed register before writing to 4a000” after scanning for btrfs filesystem

I had upgraded Ubuntu from 12 to 14 version. I have "scanning for Btrfs filesystems" before starting up, and then I've got error "Unknown unclaimed register before writing to 4a000". How can I fix it. ...
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30 views

How to mount BTRFS filesystem via CLI with switches defaults,noatime,commit=300,autodefrag

I have ubuntu on a 32GB USB2 flash stick that I carry around with me, it works fine booting on other machines I have to sometimes access. Recently I added a volume that contains a lot of data (a ...
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19 views

Scanning for BTRFS files systems

After upgrading from Ubuntu 14.04 to a point release, I get a message "scanning for btrfs file systems" at start-up. I presently do not have any drives with BTRFS, (am considering it potentially for a ...
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62 views

Raid 6 on btrfs in Vivid

Hi I'm trying to make a Raid 6 on multiple drives in Ubuntu 15.04, Btrfs is already running on 4 in raid10 when I do sudo btrfs balance start -dconvert=raid6 -mconvert=raid6 /mnt/storage/ it ...
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2015: Is BTRFS stable?

I know, questions like this have been asked before, but I'd like to get some up to date experiences.. From what I've read in various discussions, BTRFS seems like it's relatively stable, but once in a ...
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59 views

Which btrfs features are stable? How to know?

with the adaption of Btrfs by SuSe, Oracle and Facebook Btrfs has prominent support. The question appears to shift from "is btrfs stable for production" to "which set of btrfs-features are stable ...
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45 views

How do I setup JBOD by installing Lubuntu?

I want to setup JBOD (Just a Bunch Of Disks) with Btrfs on Lubuntu 15.04.
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80 views

How do I setup software RAID 0 or JBOD with BTRFS?

I've a 4GB SSD drive which is BTRFS formatted and is running Lubuntu 15.04 and a 8GB SD card (which I've always inserted) formatted as BTRFS. I want to setup software RAID 0 or JBOD, so I've more ...
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124 views

How can I deduplicate my data with BTRFS?

I have installed Lubuntu 15.04 on my EEE PC 701 with the file-system BTRFS. I want to deduplicate my data, but I don't know how.
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101 views

BTRFS bad tree block start

First some background on my setup. I have 7 Hard Drives in a raid 5 (I know, move to raid 6, but not the issue here) array. On top of that, I run LVM, with a partition for btrfs. BTRFS is at version ...
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35 views

Filesystems not mounting on boot?

I'm getting this fail after rebooting: I tried the instructions here and no dice. I also found a thread about getting rid of Btrfs but I'm not sure if that's a good idea to try. This is all on ...
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50 views

Some error messages while boot, after upgraded to 14.04 from 12.04

Recently I upgraded to 14.04 from 12.04. Now I see some error messages during every startup. Could anyone please let me know, that why am I seeing such messages? The error message as follows : ...
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1answer
68 views

Unable to mount secondary BTRFS filesystem to specific subvolume

So I'm trying to wrap my head around BTRFS and set up my fileserver using BTRFS filesystems. Here is my setup: /dev/sda1 : BTRFS filesystem, contains @, @home subvolumes mounted to / and /home. ...
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28 views

How can I make proper use of subvolumes in btrfs?

In the past, I've always used three ext4 partitions to fulfill my needs: /dev/sda2: / /dev/sda3: /home /dev/sda4: /mnt/Data Right now, I'm using Ubuntu 15.04 with the btrfs filesystem. After ...
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1answer
80 views

Installing Windows 7 after installing Ubuntu on btrfs: how to restore boot?

I've looked at the answers on this question, but none of them solved my problem: How can I repair grub? (How to get Ubuntu back after installing Windows?) My system is partitioned as follows. ...
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1answer
45 views

How to find the size of a filesystem?

How can I find out the size of a filesystem in Linux? By that I mean the exact number of bytes that are used from the partition, not just the output of df, as that can differ from the true size when ...
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37 views

Ubuntu not starting after resizing partition

my (K)Ubuntu 15.04 on btrfs ran out of space. So I fixed the issue and also resized the partition (including the btrfs volume). The next time I tried to boot the following lines showed up: Loading ...
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62 views

Re-install and keep home partition with btrfs - lost files

So, I was running Arch Linux with separate / and /home. Both were btrfs partitions, but the whole drive was not managed by btrfs. I decide to install Ubuntu 14.04. I carefully select to format / and ...
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365 views

Ubuntu and Live USB won't Boot after power cut 15.04 BTRFS

I didn't think this was a problem until it happened to me twice on two different systems and have never seen this before. First time I was running Xubuntu 15.04 on a Lenovo T61 using BTRFS. The ...
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1answer
53 views

Problem accessing old data on btrfs /home in ubuntu 14.04

I recently did a fresh installation of ubuntu 14.04 64 bit on my pc. Previously I was dual booting ubuntu 14.04 with windows(both 32 bit). My hdd is 500 GB. The previous structure of the hard disk was ...
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922 views

Error while starting ubuntu 15.04

After i have upgraded my Dell Latitude E5540 to Ubuntu 15.04 i have the following upon booting up ! Scanning for Btrfs filesystem [FAILED] Failed to start Load Kernel Modules. See "systemctl status ...
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1answer
41 views

btrfs: Resultant copy is twice the size of source

I just got an SSD and wanted to migrate my current Ubuntu installation to take advantage of its performance. So I booted to an Ubuntu live CD, mounted source (ext4) and target (SSD, btrfs mounted ...
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46 views

How to copy a btrfs subvolume along with it's snapshots to a different drive?

A drive contains /@home along with snapshots /snapshots/@home-2015-01-01, .... How do I move all of them to another drive without duplicating the data in the snapshot (i.e. simple rsync -ax would lose ...
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60 views

XUbuntu 14.04 with btrfs on SSD

I have a PC with two hard drives: SDD and HDD. On SSD I've installed Xubuntu to BTRFS partition , also I have BTRFS on second drive. The issue is that during boot I'm waiting for a long time (I guess ...
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42 views

What does btrfs do if a disk in my RAID10 dies?

I've just moved from mdadm to "native" btrfs. Under mdadm I could set my email in /etc/mdadm/mdadm.conf and if it had any issues with a disk, it would fire emails at me on boot. This has saved my ...
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70 views

btrfs performance parallel access

I'm running a Raid5 (3x 500GB Sata2 HDD) based on btrfs 3.12 (Ubuntu 14.04 x64) and a VirutalBox VM uses this volume. As long as no other process accesses the volume, the VM runs fine. But recently I ...
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How to hide btrfs devices in nautilus dynamicly

According to this question and answer: How to hide btrfs devices in nautilus? Is it possible to do this dynamically? Devices like /dev/sdc1 might not be the same on next boot, so a static ...
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112 views

How to remove a write-back EnhanceIO cache on root partition?

I accidentially created a write-back EnhanceIO cache for my root partition. I didn't know that Creating a writeback cache on root device is not supported. This is because the root device is ...
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154 views

SSD drive errors in dmesg but smartctl says all is ok

I am not extremely experience in SSD monitoring so not sure if there is an issue or not, but yesterday I noticed in dmesg a number of errors being generated from my root disk (/dev/sdb). These seem to ...
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134 views

Ubuntu does not boot successfully with btrfs root partition errors

I have a setup on my laptop in which there are three partitions relevant to Ubuntu: a ext4 /boot partition, a btrfs root partition on LUKS and a swap partition on LUKS. Sometimes, after an unclean ...
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52 views

Can somebody explain this changing `du` output?

Just tripped across a weird case of du. Putting arguments one way gives: $ du -s htdocs/.git/ feuerkraft/.git/ media/.git/ 40564 htdocs/.git/ 40740 feuerkraft/.git/ 204 media/.git/ Putting them ...
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How can I use Kernel 3.19 in 14.04 now?

So I'm rebuilding my storage server. For stability, I want to use Ubuntu server 14.04 LTS as the OS. However, I'm planning to use Btrfs with RAID 5, and this has been greatly improved in kernel 3.19. ...
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55 views

Why does my computer always need to scan for my btrfs partitions even though they are always in the same place?

I use btrfs for the / and /home partitions of my filesystem. All of the btrfs partitions I use are listed in the fstab, with the appropriate block devices, and their mounting configuration and ...
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79 views

Which subdirectories of / should have compression disabled in btrfs root filesystem?

Imagine you set up your root filesystem to be btrfs with Ubuntu 14.10 defaults (one subvolume for / and one for /home) and you want to compress and deduplicate as much as possible. Which directories ...
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228 views

Is it advisable to install Ubuntu on btrfs or ext4? [closed]

I used to install ubuntu on ext4 but I heard about btrfs. Is it advisable to use it for Ubuntu installation? What are the pros and cons?
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btrfs is full, but only half a disk is really used [duplicate]

I see this: root@wm-bot:/var/lib# du -ksh /var/lib/mysql/ 2.0G /var/lib/mysql/ root@wm-bot:/var/lib# root@wm-bot:/var/lib# df -h df: `/public/backups': Stale NFS file handle Filesystem ...
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1answer
464 views

How to mount btrfs subvolume, it isn't working / mounting

I just did: # btrfs subvolume create /@srv then: # btrfs subvolume list / ID 257 gen 73 top level 5 path @ ID 258 gen 71 top level 5 path @home ID 260 gen 65 top level 257 path @srv And added to ...
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122 views

How to recursive delete btrfs snapshot?

How can I delete a snapshot that contain in itself other snapshots? The normal sudo btrfs subvolume delete will give a error.
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254 views

How to restore btrfs snapshot with out reboot?

If I make a btrfs snapshot of my / folder as described here, I can't roll back until I restart the PC, because I can't delete the old btrfs subvolume with btrfs subvolume delete @_baroot. It will ...
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206 views

Is it a good idea to restore a btrfs snapshot with rsync?

Is it safe to use rsync to restore a btrfs snapshot? Just to give a example rsync -ax /home/snapshot/my_user_folder /home/my_user_folder where /home is my home folder and /home/snapshot is my ...
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36 views

How to properly restore a btrfs snapshot?

My / and /home partitions of my Ubuntu 14.10 system are formatted with btrfs. What is the proper way to restore a snapshot I made with out using any third party software?
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165 views

create '@' like subvolume in another partition

I have /var/log as a btrfs filesystem in a separate partition from root. I'm using snapshots for update and will later rollback. # mount /dev/sda2 on / type btrfs (rw,relatime,ssd,subvol=@) ...
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61 views

Ubuntu not booting up after uninstalling Gnome desktop

I Have Ubuntu 14.10 installed on my machine. I installed Gnome desktop on top of that. But I didn't liked it so I uninstalled the Gnome desktop using the commands sudo ppa-purge ...
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24 views

Do I likely have a bad WD Red HDD? [duplicate]

upon install of a new WD Red HDD in my server I reboot and get the Ubuntu 14.04 loading screen of An error occurred while mounting /home. Brief description: Btrfs Raid 1 filesystem 4 existing disks ...
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153 views

btrfs naming conventions and best practices

What are commonly used naming conventions and best practices for btrfs? How are subvolumes and snapshots named? Where are they placed? Subvolumes within subvolumes good/bad/matter-of-taste/avoid? Any ...
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175 views

I am unable to mount my previous btrfs RAID 1 home directory on reinstall of Ubuntu server 14.04 (was using 14.10)

Update 2 I mounted as degraded to /home and something interesting happened: jake@DAVYJONES:~$ sudo mount -o degraded /dev/sdb1 /home jake@DAVYJONES:~$ sudo btrfs fi show Label: Home uuid: ...