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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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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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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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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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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3answers
4k 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 ...
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1answer
97 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 ...
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1answer
36 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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30 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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1answer
944 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 ...
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1answer
1k 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: ...
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1answer
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Installing 14.04 Server to exisiting btrfs subvolume

I have an existing btrfs raid1 volume consisting of 4 disks. This already contains a few subvolumes of which I'm looking to install Ubuntu to one of. I've done the following: mount -o subvolid=0 ...
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2answers
709 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. ...
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67 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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1answer
28 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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1answer
153 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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6answers
10k 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 ...
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41 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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1answer
110 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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1answer
149 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
59 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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65 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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33 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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3answers
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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 ...
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1answer
95 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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1answer
2k 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 ...
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42 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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84 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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1answer
136 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: ...
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4answers
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How stable is BTRFS in Ubuntu?

I see entries describing BTRFS on Ubuntu 12.04 has some concerns due mostly to the maturity of the BTRFS product. Now that we have 13.10 available, is the BTRFS file system reliable?
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1answer
565 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 ?
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27 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 ...
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43 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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28 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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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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1answer
43 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 ...
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112 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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113 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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29 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
124 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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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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1answer
85 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 ...
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58 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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2answers
3k 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 ...
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414 views

Problem with booting Ubuntu 14.04 from a btrfs partition

I have installed Windows 8.1 Update 1. After that I have installed Ubuntu 14.04 on a btrfs partition. However, after the restart there was no GRUB menu to choose from and the system booted directly to ...
2
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1answer
328 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?
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47 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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2answers
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How to create an external selfhealing btrfs USB HDD RAID 1 array?

The hardware is an external 2TB bus powered USB disk. What I want is a RAID1 setup of 2x 1TB btrfs. Is this possible? How? __ Motivation The motivation for me to use RAID1 btrfs is because I ...