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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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
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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 ...
2
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1answer
470 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 ...
2
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1answer
574 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 ...
2
votes
1answer
633 views

Ubuntu Server 12.04 start fails after update

I did an system update on Ubuntu Server 12.04, which requested a reboot. Since that, the system never reaches the login. It hangs on: mount: mounting /dev on /root/dev failed: No such file or ...
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1answer
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 ...
1
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1answer
63 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 ...
1
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1answer
931 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
2k views

How to change btrfs partition label/uuid?

I upgraded to a new harddisk by using dd to copy the partition. As the old disk is still in place, the computer seems to randomly boot one or another. To fix this I thought, changing the UUID/LABEL of ...
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1answer
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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0answers
162 views

Deleted Items not appearing in Trash folder. Stuck in .TRASH-1000

I have a three 3TB discs in a BTRFS RAID 1 configuration mounted at /mnt/btrfs on my machine. There is a symlink at /btrfs. There are a number of subvols within this, /archive /backups /games /home ...
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5 views

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 btrfs balance -dconvert raid1 -mconvert raid1 would change it so ...
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0answers
43 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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0answers
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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50 views

Harddisk operations totally brings down my system respond time to its knees

I have massive system slowdowns during harddisk operations on my PC. My Firefox is responding slow, it gets to a extreme at times that it actually becomes a not responding program and greys out during ...
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167 views

upgrade btrfs without upgrading kernel?

We're running ubuntu 14.04.4 LTS with 3.13.0-38-generic kernel and btrfs v3.12 I've read that a min version for btrfs of 3.14 is desirable. Due to one of our programs integrating with kernel we are ...
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156 views

Grub does not start anymore after removing a btrfs partition

I'm using Ubuntu 14.10. Consider the following setup: ubuntu@ubuntu:~$ sudo blkid /dev/sdb1: UUID="0dde146f-ebdc-472d-83a2-48104e23cb8f" TYPE="swap" PARTUUID="00061e41-01" /dev/sdb5: ...
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76 views

Mount and access similar BTRFS filesystem

Say that I duplicated a disk to a new disk (using dd or similar), and have been using the new disk for a while. But, then I decide I want to view a file or files on the old disk quickly, specifically ...
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73 views

Multiple Independent BTRFS Volumes

I have 4 x 2 TB drives. I want to set up one pair as a BTRFS RAID 1 volume, which I have done. I want to set up the second pair as a RAID 0 data, RAID 1 metadata volume, which I have not been able to ...
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226 views

BTRFS cannot delete snapshot - operation not permited

I cannot delete a the btrfs subvolume "2014-07-28" which is a snapshot of the "@" created by the kubuntu installer to serve as the kubuntu root. teneighty@teneighty-MS-7924:/$ sudo mount -o ...
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1k views

How to get rid of the “scanning for btrfs file systems” at start-up?

At start-up, I see the message Scanning for btrfs file systems. How can I get rid of it? I have tried to remove the package with sudo apt-get purge btrfs-tools, but it just shows a blank screen ...
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520 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 ...
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446 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 ...
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16 views

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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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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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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46 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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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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0answers
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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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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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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0answers
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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22 views

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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0answers
158 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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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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0answers
124 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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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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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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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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0answers
36 views

How to rsync a home folder

I have a btrfs snapshot of my home folder ( let's say my snapshot is in /home/dan/snap1) How can I use rsync to "rollback" to that snapshot and not mess up things?
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52 views

Can't rollback btrfs snapshot

I have a btrfs snapshot in /home/user1/snapshot of my home folder and I want to rollback, but mv /home/user1/snapshot /home doesn't work it will just move it in /home/snapshot. What should I do?
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180 views

grub-install fails during 14.04 install with btrfs on sda

I used the manual partitioning option in the Kubuntu 14.04.1 installer to make a btrfs partition on /dev/sda. Of course it leaves 1 MB free at the start of the disk and I verified this with ...
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0answers
45 views

Uncompressing btrfs drive

I know you can compress or recompress an entire drive during a defrag with -clzo or -czlib flag but is there a way to uncompress during a defrag? Like -cnone or something? Also does defrag compression ...
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0answers
112 views

Why is my read speed limited to 40 MB/s (< 25 %) reading from ext4 when compress-force is zlib and there's no CPU usage?

I'm moving data from an ext4 filesystem on a HDD connected with USB 3.0 which usually reads and writes with 170 MB/s to a btrfs subvolume on a SSD which usually reads and writes with 360 MB/s with ...
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49 views

changing root ssd with btrfs data array

I have a Corsair 120GB SSD holding my Ubuntu OS and three 3x 3TB disks in a BTRFS RAID1 configuration holding everything else including home, photos, music, etc. I may need to replace my SSD for ...
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62 views

Is it correct behavior if badblocks destroys the partition table if invoked with -n option/in non-destructive mode on a device file?

I'm having trouble to believe that badblocks didn't destroy my partition table (help for restauration shall not be the issue here), so this question came up. There's been one btrfs partition on the ...
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15 views

Weird “btrfs” item in bootchart without having any bootchart partition

I've bound two weird items in the bootchart: https://public.v6ak.com/bootchart-btrfs-ntb-precise-20140918-3.png There is "btrfs" and "btrfsctl". It seems that other processes are delayed after the ...
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2k views

Errors during start-up: “Scanning for Btrfs filesystems”

I have installed Ubuntu 12.10 desktop on three systems and one virtual machine. On every system I have opted for a single Btrfs partition. During start-up I get the following two error messages. It ...