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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1answer
567 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 ...
5
votes
1answer
2k views

Grub fails to install - core.img 'unusually large' [closed]

When trying to resurrect my (t)rusty 'ol router who's system disk (CF card) had failed (probably because I neglected to tune Ubuntu properly for this type of media), I wanted to use the opportunity to ...
3
votes
1answer
3k views

btrfs and missing free space

I converted my ext4 partition to btrfs and deleted the save subvolume after doing so. Then I enabled the compression (lzo) of the filessystem in the fstab file and everything is correct so far. Then ...
4
votes
1answer
310 views

How to hide btrfs devices in nautilus?

I've got a btrfs file system consisting of 3 devices and using raid1. The file system contains one subvolume "home" which is defined in the fstab and mounted at "/home". fstab entry looks like this: ...
1
vote
1answer
766 views

How does one undelete or repair BTRFS partitions?

Had a power‐cut last week and thought nothing of it but today when I opened (mounted) a data partition for archiving edited video files, I noticed it had 50GB free when it previously had only 2… ...
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2answers
1k views

How do I install the btrfs-restore utility on 12.04?

I would like to install btrfs-restore on Kubuntu 12.04 apt-cache search btrfs-restore returns nothing. Google "ubuntu download OR install btrfs-restore" returns nothing useful. Also, where do I get ...
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vote
5answers
6k views

How do I recover a BTRFS partition that will not mount?

The installation for 12.04 kept failing, and the solution was to have the installer ignore the btrfs partition that I have previously been using for /home. Now that it's installed, I've been trying ...
3
votes
3answers
2k views

btrfs with multi devices fails automount in fstab

I'm trying to automount btrfs on 12.04-desktop-amd64. During bootsplash, fstab failed to mount btrfs and asked skip or manually prepare. On the rootshell, btrfs device scan and mount -a could ...
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2answers
2k views

Block-level deduplicating filesystem

I'm looking for a deduplicating copy-on-write filesystem solution for general user data such as /home and backups of it. It should use online/inline/synchronous deduplication at the block-level using ...
6
votes
1answer
1k views

How to stop disks from being automagically mounted on boot?

I have a btrfs filesystem RAIDed across several disks. The machine is connected via USB to an external hard-drive bay where three disks live. In my fstab I have a mount entry for one of the disks ...
15
votes
5answers
11k views

Is it safe to use Btrfs?

Is it safe to use btrfs in Ubuntu 12.04? Linux kernel version: 3.2.0-24-generic Architecture: x86_64 (64-bit)
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5answers
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Will btrfs automatically compress existing files when compression is enabled?

I chose btrfs as the format of my / filesystem in the Ubuntu 12.04 LTS installer. After the installation completed, I added compress=lzo to the mount options in /etc/fstab and rebooted. Will the ...
11
votes
3answers
7k views

How to make a btrfs snapshot?

My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular. I am aware that there are similar ...
1
vote
1answer
1k 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 ...
9
votes
3answers
5k views

Btrfs subvolumes vs folders?

I've read a fair bit about btrfs's subvolumes feature. While it would seem interesting to have subvolumes for the main categories in a data filesystem, such as @films, @pictures, @music... What ...
4
votes
3answers
3k views

How can I upgrade to a newer version of btrfs-tools?

The btrfs tools package in 12.04 appears outdated and doesn't take advantage of the newer features such as scrub introduced in kernel v 3.0. How can I upgrade to a newer version? Do I need to compile ...
8
votes
1answer
12k views

Can 12.04 be installed using Btrfs only?

In the past it was not possible to install Ubuntu on a pure Btrfs file system (/ btrfs + swap), will it be possible for 12.04?
2
votes
2answers
673 views

Home server filesystem

I'm planing to build a home server to act mainly as a uTorrent download and file server for me and the people I live with. I have come up with the following filesystem configuration and I would like ...
21
votes
2answers
18k views

Message “Sparse file not allowed” after installing on a btrfs filesystem

I've installed Ubuntu without creating a swap partition and with / on a btrfs.# Now I get the message "Sparse file is not allowed" on each boot. This message appears before the splash-screen. Is there ...
2
votes
1answer
953 views

Install Ubuntu with BTRFS and more subvolumes

I want to install an Ubuntu Server with a BTRFS filesystem (in a RAID1 way). The problem is that I can't see the option in the installer to make more subvolumes. The installer creates two by default: ...
2
votes
1answer
2k views

Converting to btrfs from md raid5 with lvm

I have decided to start the transition to btrfs this weekend. I have a desktop with one md raid1 which is used for boot, and one large md raid5 for everything else. On top of the md raid5, I have LVM ...
1
vote
1answer
391 views

When will btrfs-progs (stable??) arrive in the repositories?

just realized that arch linux exchanged btrfs-progs-unstable (from 2010) with btrfs-progs (from 2012, presumably stable, at least not unstable). I am aware that arch is normally very quick at ...
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0answers
573 views

Is there a way to upgrade BTRFS? [closed]

Do I need to upgrade a BTRFS filesystem after upgrading Ubuntu, like I would with ZFS?
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vote
1answer
751 views

How can I move a btrfs partition? (after resizing it)

Is it possible to move a btrfs partition (after I shrinked it)? (e.g. as described in How can I safely resize (shrink) a BTRFS partition?) I need this to grow the partition before the btrf partition. ...
3
votes
2answers
4k views

How to install using btrfs in RAID10 mode?

As a test I want to install Ubuntu 11.10 onto a btrfs file system in raid10 mode. However, I have no clue on how I should go about that. I have tried the installer, and then creating the fs in the ...
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2answers
3k views

How to convert a btrfs file system in raid1 mode to raid0?

I've install Ubuntu 11.10 with btrfs as the / file system (was a bit of a mess to do, I'll explain if people are interested) so I can expand the primary file system into the second drive on the ...
5
votes
2answers
5k views

Btrfs Defragmentation Of Files/Folders

I have just installed Ubuntu 11.10 on the Btrfs filesystem and I want to ask a question about defragmentation of files. Do I really need to defragment files or the whole system? Defragment # btrfs ...
5
votes
2answers
709 views

Is it safe to remount btrfs with compression?

I've finally found how to enable compression in btrfs, and would like to do so. However, as my main drive, I'm not really wanting to risk a change that could corrupt the hard drive. Everything I've ...
1
vote
0answers
1k views

Add btrfs root parition entry to Grub2 [closed]

I have a separate 10GB partition to test pre-release builds. This time I decided to test the btrfs as root. After finishing installation, ubiquity showed an error message stating that grub could not ...
10
votes
2answers
13k views

How can I safely resize (shrink) a BTRFS partition?

I have my /home on a BTRFS partition and I need to shrink it, unfortunately Gparted does not have the resize option for this FS. Can I resize it in any other way without losing my data?
11
votes
3answers
12k views

Should I use btrfs or Ext4 for my SSD?

Should I use btrfs (with discard, compress=lzo and space_cache options) or Ext4 (with discard option) for the SSD for my Ubuntu 11.10 (Oneiric) amd64 desktop root partition of my office machine? ...
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vote
0answers
375 views

System hangs after second time suspending [closed]

I installed a new system when oneiric was released I am also using gnome classic and have the following layout: /dev/sda3 on / type btrfs (rw,noatime,relatime,subvol=@) /dev/sda3 on /home type btrfs ...
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vote
2answers
1k views

ubuntu 11.10 btrfs errors after every reboot

I installed a new system when oneiric was released I am also using gnome classic and have the following layout: /dev/sda3 on / type btrfs (rw,noatime,relatime,subvol=@) /dev/sda3 on /home type btrfs ...
4
votes
1answer
1k views

How do I recover a BTRFS partition formatted by mkfs.btrfs?

I've accidentally formatted one of my partitions with btrfs 0.19 filesystem, on 11.04, kernel 2.6.38-8-generic. The command issued was: mkfs.btrfs -L EADS-old /dev/sdd2. After this I didn't write ...
22
votes
2answers
7k views

What is the current situation with BtrFS and 11.10?

It feels like I've read about BtrFS forever, but there has always been something that makes me not want to use it. But I'm guessing things are improving, so I'd like to know what the situation is ...
12
votes
2answers
3k views

btrfs partition won't mount after upgrading 64bit Ubuntu 11.10 laptop

I have tried many ideas from the net, but none of them work. This looks correct and in good order **sudo btrfs filesystem show /dev/sda2** failed to read /dev/sr0 Label: none uuid: ...
2
votes
2answers
339 views

How to remove subvol from partition?

I installed Natty 64-bit with btrfs filesystem only to find that it takes almost two minutes to boot. I tried a few different things, and finally today opened up /etc/fstab only to find the ...
0
votes
2answers
184 views

Upgrade from 10.04 to 11.04, must maintain minimum kernel 2.6.38 [closed]

I have a machine running 10.04 and am using BTRFS with lzo compression. I upgraded the kernel to 2.6.38 to enable this (using a PPA). I have my /home folder on a separate (4 TB) BTRFS drive. / is on ...
3
votes
2answers
3k views

How does btrfs RAID work in degraded mode?

My idea was that (using loopback devices) it works like this Create the raid array sudo mkfs.btrfs -m raid1 -d raid1 /dev/loop1 /dev/loop2 You mount them sudo mount /dev/loop1 /mnt and mark them ...
1
vote
2answers
1k views

Possible/viable to make a btrfs RAID between SSD and HDD?

Since I don't use my laptop's CD-drive I want to put a small (8 GB) SSD into the CD-drive slot (I'll use a caddy similar to this one). I want to use compressed btrfs on the SSD and put all the data on ...
5
votes
1answer
890 views

How to layout the filesystem for a small SSD and a big HDD?

Since I don't use my laptop's CD-drive I want to put a small (8 GB) SSD into the CD-drive slot (I'll use a caddy similar to this one). I want to use compressed btrfs on the SSD and put all the data on ...
5
votes
4answers
2k views

btrfs - Unknown filesystem?

Today when I went ahead with Natty installation I had selected btrfs for root filesystem. To my utter surprise I was presented with the screen Unknown filesystem grub rescue > None of the ...
0
votes
2answers
2k views

Resilience of Btrfs inside RAID5

Btrfs currently lacks fsck, risking corruption if there's a power failure. To what extent, if at all, would creating a btrfs filesystem within a RAID5 array mitigate this?
6
votes
2answers
10k views

How can I convert my root partition from BTRFS to EXT4?

Is it possible to convert btrfs to ext4 without losing data? I'm experiencing a very low speed on read/write operations on btrfs.
0
votes
2answers
1k views

How can I solve my boot error with Natty and btrfs?

I'm getting this boot error on Natty: mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys on /root/sys failed: No such file or directory mount: mounting /proc on ...
9
votes
3answers
3k views

btrfs snapshot management

1) Is there a gui or curses tool that allows you to view/manage btrfs subvols/snapshots? 2) Is there a utility or already made script that would automatically create and delete snapshots ...
6
votes
1answer
2k views

How does apt-btrfs-snapshot work?

I read on the planet that apt-btrfs-snapshot would be available for Natty. The brief description of what it does sounds very nice: it will automatically create filesystem snapshot (of everything ...
2
votes
0answers
1k views

How do I recover a BTRFS filesystem with “parent transid verify failed” errors? [closed]

I've got an external USB disk running btrfs. I use it for backups, and each time I do a backup I take a snapshot. However, it's giving me this error now: parent transid verify failed on 109973766144 ...
5
votes
2answers
809 views

Is there another way for me to backup /home/user other than creating a subvolume?

I think I'm having difficulty fully understanding subvolumes and snapshots. The /home partition is btrfs. I want to create a "backup" snapshot of /home/user (for example) but user has existed for ...
1
vote
3answers
1k views

Using btrfs in RAID arrays and partitioning

Probably stupid questions but here goes: Can btrfs use only a portion of a HDD in a raid "array"? I have 3 HDDs: 80GB, 160GB, and 200GB external USB. I want to put root+boot in the first 20GB of the ...