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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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 ...
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1answer
290 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.
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2answers
2k 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 ...
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1answer
1k 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
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1answer
373 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)? ...
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0answers
432 views

Will snapper (for btrfs) work well on Kubuntu 12.04?

I'm running btrfs in Kubuntu 12.04 with SSD's. My boot partition is ext2, but my home and root partitions are btrfs. I'm very interested in using the snapper tool (from OpenSuse). I just learned that ...
3
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0answers
305 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 ...
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1answer
85 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 ...
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1answer
2k 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: # ...
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2answers
1k 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 ...
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1answer
661 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 ...
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1answer
482 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 ...
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2answers
410 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
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1answer
107 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 ...
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1answer
800 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 ...
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1answer
171 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 ...
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1answer
2k views

How to use Btrfs with compression on external USB hard drive?

I would like to make use of Btrfs' transparent compression on an external drive. Which tool is best for formatting the drive? Disk Utility or GParted? How do I activate the compression? During ...
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1answer
845 views

Is this tactic of switching from btrfs to ext4 safe?

I've been using btrfs on Ubuntu 12.10 for both / and /home for several weeks. Through out the time I've come to the conclusion that ext4 performs better on my system and I'd like to switch back ...
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0answers
1k 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 ...
11
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2answers
3k views

How can I convert an ext4 partition to btrfs (or other file systems) without losing data?

I wish to convert my current /home partition to BTRFS (or other file systems) without losing data if possible, what steps should I take for this? is it safe?
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3answers
6k views

Moving /boot to a separate partition

I've installed Ubuntu 12.04 on a partition with BTRFS as its file system, but it appears that grub2 seems to have some issues with that file system. For some reason it takes it very long time to boot ...
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1answer
483 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
1k 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 ...
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1answer
2k 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 ...
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1answer
265 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: ...
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1answer
644 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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5answers
4k 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 ...
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3answers
1k 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 ...
3
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1answer
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 ...
5
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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 ...
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5answers
10k 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
7k views

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
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3answers
5k 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 ...
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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 ...
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3answers
4k 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 ...
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3answers
2k 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 ...
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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?
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2answers
616 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
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2answers
17k 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
826 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 ...
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1answer
373 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
517 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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1answer
609 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. ...
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2answers
3k 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
2k 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 ...
4
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2answers
4k 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 ...
4
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2answers
674 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 ...
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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 ...