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.

learn more… | top users | synonyms

3
votes
2answers
595 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 ...
1
vote
1answer
104 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 ...
3
votes
1answer
7k 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 ...
2
votes
1answer
136 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 ...
1
vote
0answers
81 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 ...
0
votes
1answer
176 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 ...
2
votes
0answers
289 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 ...
1
vote
0answers
301 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 ...
1
vote
1answer
87 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 ...
26
votes
4answers
50k views

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. ...
0
votes
1answer
201 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 ...
1
vote
1answer
596 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?
2
votes
1answer
2k 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 ...
0
votes
2answers
365 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.
0
votes
1answer
706 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 ...
4
votes
1answer
477 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 ...
0
votes
1answer
324 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=@) /dev/...
0
votes
1answer
292 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: 3673d0b0-...
9
votes
1answer
7k views

Does Ubuntu plan to move to btrfs as default filesystem?

Btrfs seems to have a set of useful features such us snapshots and is default in Opensuse and Suse.Fedora plans to move to it. Does Ubuntu plan to move to it? If not, why ?
0
votes
1answer
36 views

Why does mv refuse to work?

I am writing a small software in Java to act as a G.U.I for btrfs commands as a high school diploma project . I want to be able to take a snapshot and restore it in real time if I do a btrfs subvolume ...
1
vote
0answers
71 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 ...
0
votes
1answer
55 views

Moving boot disc to another

I have Ubuntu 14.10 installed on a Corsair SSD but am becoming a little nervous at the increase of smart errors appearing from it. I am considering the purchase of a new SSD to take over the role but ...
2
votes
0answers
274 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 ...
1
vote
0answers
249 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: UUID="ffead33a-...
0
votes
1answer
234 views

Mounted btrfs will [not] compress?

I have a partition formated to btrfs and im willing to store there stuff that I don't use that often but which I need fast access from time to time (some dumps of my PS2 games for now) because I have ...
1
vote
0answers
91 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 ...
2
votes
1answer
436 views

Ho to make btrfs snapshot in Ubuntu 14.10?

I have installed Ubuntu 14.10 with the / partition as btrfs, I want to make a snapshot of the subvolume /home occasionally. How to I proceed?
4
votes
1answer
249 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 /...
0
votes
1answer
1k views

How can I get rid of “scanning for btrfs filesystems” at start-up?

When I start up my computer, it says: "scanning for btrfs filesystems". I do need the btrfs-tools, but my btrfs filesystems are on a removable disk which is disconnected at start-up. Scanning for ...
2
votes
1answer
335 views

Btrfs subvolume @home not mounted kernel upgrade 3.17

i'm having trouble upgrading my kernel to the latest 3.17 rc3 mainline kernel. I'm currently on a patched kernel 3.13 for my Acer chromebook c720p, the 3.17 kernel would give me support for touchpad ...
1
vote
1answer
4k views

How to reformat my SD card?

I have a micro SD card (/dev/mmcblk0) with one partition on it (/dev/mmcblk0p1). There is a btrfs filesystem on it, that won't mount. When I insert it, I get an error message on the desktop, saying: ...
1
vote
1answer
492 views

Is there anything that ext4. btrfs, or F2FS can do for a usb3.0 thumb drive that fat does not do? [closed]

I don't particularly care about cross platform. I have a thumb drive, and what to know if there is anything to gain from formatting it to ext4, btrfs, or f2fs. Thanks
2
votes
0answers
100 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 ...
2
votes
1answer
368 views

Cannot delete encrypted btrfs snapshot

I created a btrfs snapshot some time ago and now I want to delete it, as it appears to be taking up a lot of space. When I list snapshots, I get: 11:59:16::root@pounamu::/mnt ↪ btrfs subvolume ...
1
vote
1answer
210 views

How to set USER_SUBVOL_RM_ALLOWED capability?

I try to remove btrfs snapshot as a normal user. I've read, that a user needs to have some special capability/right set: USER_SUBVOL_RM_ALLOWED. How to grant such capability to user??
2
votes
1answer
1k views

Why is btrfs slower than ext4, and why would I want to use it in an ubuntu install? [closed]

At this time (August 2014); having been following the benchmarks for btrfs on Phoronix,(http://www.phoronix.com/scan.php?page=home) and have been seeing on the aggregate; slower performance than ext4; ...
2
votes
0answers
498 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 subvolid=...
3
votes
1answer
201 views

How can I prune my BTRFS backups?

I have a BTRFS backup system where I take daily snapshots (btrfs subvolume snapshot) and serialize them into incremental change files based off the previous days backup (btrfs send -f backup.date ...
2
votes
1answer
829 views

Are re-combined BTRFS incrementals identical to the original?

I have several systems running btrfs, and I'd like to use the btrfs subvolume send/receive features as a backup solution. I want to send daily incrementals to remote as efficiently as possible. That ...
1
vote
1answer
2k views

how to disable 'scanning btrfs filesystem' at system startup

After upgrading from Ubuntu 12.04 to Ubuntu 14.04, I get a message "scanning for btrfs file systems" at starting-up. I don't have any BTRFS filesystem. It delays the booting for about 15 seconds. I ...
1
vote
0answers
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 ...
2
votes
1answer
4k views

How to use UUIDs in fstab for configuring btrfs RAID1

This is similar to this question, but the solution there was to choose the disks using "device=/dev/sda1,/dev/sdb1", which is not as robust as using UUIDs. I'm sure it can be done, but I can't find ...
0
votes
1answer
779 views

Install Kubuntu with btrfs

I don't have much space on the hard drive, so I was considering using btrfs for my hard drive. I'm aware that btrfs is not stable yet, but I'm interested in installing Kubuntu with it anyway. How can ...
2
votes
2answers
3k views

btrfs for deduplication and compression at the same time?

I'm thinking about using btrfs functions for both deduplicate and compress my storage... My question is: is it efficient? I mean, does it deduplicate AND compress at the same time efficiently?! I'm ...
0
votes
1answer
341 views

Delete snapshot make filesystem read-only

I am using Btrfs 3.12 and each time i delete a snapshot, the entire btrfs volume become "Read only". So i umount it and try a btrfsck --repair But every time it failed on this line: Extent back ...
0
votes
2answers
261 views

Btrfs snapshot marked as deleted

I am using Btrfs v3.12 and each time I delete a snapshot it is not deleted, marked as "DELETED" but the global size of the volume doesn't change. I have never seen that in older version of BTRFS. /...
3
votes
1answer
523 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, used=340....
6
votes
1answer
2k 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
9k 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 ...
3
votes
0answers
652 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 ...