btrfs is a B-tree based, copy-on-write filesystem for Linux. It's main features include snapshots, checksumming of data and filesystem level RAID support. It's similar to [tag:ZFS].

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BTRFS new device cannot be added

I have a raid10 setup with btrfs with 5 disk currently: Total devices 5 FS bytes used 6.89TiB devid 1 size 3.64TiB used 2.83TiB path /dev/sde devid 2 size 3.64TiB used 2.83TiB path /dev/sdd ...
5
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4answers
1k views

Backup/Clone a btrfs partition

Is it possible to backup a btrfs partition verbatim (including all the shared structures which save space by marking snapshot trees as COW) to another one? For instance, I'd like to backup my root ...
0
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2answers
1k views

NFS on Btrfs on multi-devices .vs. Glusterfs on distributed-volume?

I considering a storage for Email. This storage system run on my own private cloud (already replicated), then i does not care about replication. I'm thinking about 2 options: 1- I will create few ...
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0answers
21 views

More available space than expected using btrfs RAID10?

I had just created a btrfs RAID10 array in my Ubuntu 14.04 box for the first time by using the command: mkfs.btrfs -d raid10 -m raid10 /dev/sda /dev/sdb /dev/sdc /dev/sdd My 4 hard drives are each ...
2
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2answers
53 views

ext. 2-bay USB-Drive with RAID: btrfs RAID vs built-in RAID

For backups I want to use an external USB3 Drive: two HDD with RAID 1 (mirror) in one 2-bay enclosure. As filesystem I'll use btrfs because of subvolumes and checksums. Performance isn't important, ...
2
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1answer
64 views

Using grml with btrfs

I'm trying to boot an ISO using grml and grub on a BTRFS root. However, after selecting the boot option from the menu grub (or some subsequent loader) fails to find the iso ...
0
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0answers
40 views

How much usable space will a 2TB+2TB+3TB+3TB btrfs filesystem have with data in RAID-1 mode?

I have a pair of 3TB drives in a btrfs filesystem, and I wish to expand this filesystem by adding two more 2TB drives, using the btrfs device add command. Data in the current filesystem is mirrored in ...
6
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1answer
656 views

What are my prospects of recovering old version of file on BTRFS

I've accidentally overwritten an important file on BTRFS. Knowing that this filesystem is COW, it should be in theory possible to recover an old version of the file. Unfortunately googling didn't ...
-1
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1answer
104 views

Balanced btrfs filesystem using different amounts of space on each disk

I recently upgraded a desktop server with 2 drives (1TB+3TB) drive to one with 1x1TB and 3x3TB drives. In the process, I installed btrfs and raided the 3TB drives together, leaving the 1TB drive as a ...
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5answers
5k views

btrfs-enabled backup solution

With btrfs hitting production in Oracle EL 14th this month (together with working fsck and scrubbing from Linux 3.2) I was thinking of redesigning my current backup solution to utilise it. Note that ...
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0answers
43 views

btrfs send from a 3tb drive ti btrfs-receive on a 1tb drive

I have question about the nature of a subvolume Snapshot sent and received. I have 2 3tb raid1 drives with only about 300gbs on them. I have a spare 1tb drive I placed in an enclosure for backups. ...
3
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1answer
38 views

Does btrfs share file parts across snapshots?

I know that modern filesystem snapshots take very little space until they start to diverge by changes in files. However, I have been unable to identify at which granularity btrfs manages the changes. ...
9
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3answers
2k views

Proper way of handling LXC containers on btrfs

Lets say we have one server with lxc installed, and a lxc container used for as a base img /var/lib/lxc/ubuntu_base. For simplicity let's forget the config changes after copying the base img. some ...
2
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2answers
3k views

Linux-on-Linux KVM: Which filesystem should I use for guest and host?

I'm in the process on playing around with KVM and setting up a linux on a linux-server, so I can reboot the (guest)server encrypt the rootFS of the guest without having to do initramfs-tricks to get ...
0
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1answer
124 views

How do I use 2 disks for CoreOS?

I've got a bare metal server with 2x 480gb SSD disks. I will run a CI server with docker on CoreOS. Do I have to add another small disk to hold CoreOS and mount the 2x SSDs as /var/lib/docker?
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1answer
75 views

BTRFS raid with odd number of devices

I used to have RAID10 btrfs setup with 4 disks. Now I added sdf a new disk (its doing the balancing): Total devices 5 FS bytes used 5.73TiB devid 1 size 3.64TiB used 2.78TiB path /dev/sdd devid ...
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0answers
61 views

Btrfs data single mode behaviour when on of devices fail

I want store non critical data on more HDDs (one 2 TB and two 500 GB devices) using Btrfs filesystem with distributed metadata but single data. As I have said, data will not be critical, so if one ...
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0answers
106 views

Removing files takes too long

Short version: rm -rf mydir, with mydir (recursively) containing 2.5 million files, takes about 12 hours on a mostly idle machine. More information: Most of the files being deleted are hard links to ...
1
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1answer
314 views

BTRFS, sector alignment and Advance Format Disks

I want to set up a BTRFS RAID1 setup with two WD Red 4TB disks, which possess 4K sectors. Since I am keen to get it right the first time before copying data to it (yes it will be backed up), my ...
3
votes
1answer
237 views

Directories inside /var are on root partition not /var partition

Few weeks ago I installed Opensuse 13.2. I partitioned the disk so that root '/', /var, /tmp and /home are on different partitions. Today I noticed that although /var is on partition sda8, all ...
2
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1answer
1k views

How do I get the size of a btrfs subvolume (compressed vs. uncompressed)

Is there a command to get the on-disk size of a btrfs subvolume? The file system was mounted with -o compressed and the subvolume contains a lot of files that should compress rather well. I could use ...
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0answers
96 views

Snapshot of BTRFS Device on top of luks Volume

I have the following problem: I can't figure out, how to create a snapshot of a btrfs volume residing on a crypted disk. This is the setup: /dev/sdb is a 1TB USB 3 disk. it has a partition ...
0
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1answer
156 views

Can't delete a btrfs snapshot

I have a system that creates periodic btrfs snapshots and deletes old ones. Today, I've started receiving warnings that the system can't delete some old snapshots. This is the output I get: ...
2
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1answer
794 views

Debian package performance on XFS, btrfs, ext3, ext4

I did 4 clean installations of debian 6 and measured time of installing some average virtual package. FS options are default. time apt-get install build-essential I got very strange results ...
2
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1answer
258 views

Can I mount a read-only btrfs volume across multiple machines?

Is it possible to have a single btrfs mounted volume read-only mounted across multiple machines? Can one of the hosts mount it read/write to provide updates to the others? The reason I'm asking this ...
14
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7answers
4k views

Is btrfs production ready?

I've seen a lot of information on btrfs lately. I have been considering ext4 for my next filesystem, but am tempted by btrfs instead. How widely used is btrfs? What are the pro's and con's?
5
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2answers
2k views

btrfs Integrity and Stress Testing

A DevOps colleague is recommending that we begin transitioning our production environment to using btrfs. We have primarily ext4 filesystems, though some low-usage servers using ZFS (on Linux). As ...
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5answers
3k views

Does Windows have a checksumming filesystem like ZFS or BtrFS?

I use ZFS and love it. I know that BtrFS also supports checksumming. I've been told that checksumming is available in Windows 2008, but I've been unable to verify this. Are there checksumming ...
1
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1answer
197 views

Mounting compressed filesystem using FUSE

I'd like to move some folders on my computer to a compressed read/write images, so I could get it to take less disk space on my machine (the folders contain some Mercurial and Git repositories). ...
3
votes
2answers
710 views

BTRFS and Luks integration

I would like to build a RAID1/BTRFS/Luks setup. What I found about it so far is: An encrypted Btrfs file system can be created on top of the dm_crypt disk encryption subsystem and Linux Unified Key ...
4
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2answers
3k views

How to delete a btrfs snapshot?

I'm new to btrfs and I am trying to delete some snapshots I made a few months ago. They're taking up about 20GB of space, and I need that space back. This seems to list the snapshots: ↪ sudo btrfs ...
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1answer
606 views

recovering a corrupt degraded btrfs RAID6, need to manually clear an inode

I have a btrfs RAID 6. I have lousy hard drives, one failed, and another failed during recovery. Now I am without parity and cannot rebuild--a third drive is throwing read errors on a few sectors. ...
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1answer
155 views

btrfs formatted partion not mounting from fstab

I have this new mageia 4 setup with some btrfs partitions. My root "/" is on btrfs, working fine. from fstab: UUID=b2b0263e-a04a-4bd7-86d7-d2ec19a90b84 / btrfs relatime 0 0 then I have a different ...
3
votes
1answer
2k views

Converting BTRFS filesystem to RAID1 fails with “Inappropriate ioctl for device”

I had a ~1.6TB BTRFS volume on a single partition, to which successfully I added another freshly created and formatted partition (on another device) of exact same size with the intent of mirroring ...
0
votes
1answer
88 views

Multi-Volume data storage without striping

I have a network storage server running Debian, containing multiple hard drives. These drives are all mounted into subdirectories of a samba-shared folder. All members of the network have full read ...
2
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0answers
59 views

Remove a file from a btrfs snapshot and still use btrfs send/receive?

I'm planing to use btrfs send/receive to synchronize two filesystems and keep a few older snapshots (like a time machine) on the backup. Now what happens if a user ask me to remove a file or ...
6
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1answer
388 views

BTRFS: deleting a volume

A week ago, I created a BTRFS pool using two flash drives (32GB each) with this command: /sbin/mkfs.btrfs -d single /dev/sda /dev/sdb. Then I realized that I should have used the partitions /dev/sda1 ...
14
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2answers
2k views

Does btrfs have an efficient way to compare snapshots?

While diffing mounted snapshots would work, it sounds like it could be horribly slow in many cases. Is there btrfs specific functionality for diffing snapshots? (I was unable to find any in the docs) ...
0
votes
2answers
828 views

LXC container starts with readonly root filesystem

I am running LXC on Debain Wheezy using BTRFS, and have created a container using lxc-create using the "debian" template (yesterday). When starting the container, the root filesystem in the container ...
4
votes
2answers
436 views

LVM snapshot of btrfs volume changes mounted device

I have a btrf volume on top of LVM. Now I want to do a snapshot on the lvm level (NOT on the btrfs level). But every time I create the LVM snapshot, btrfs changes the mounted block device to the ...
2
votes
1answer
379 views

Redundancy level on a per file basis with BTRFS?

I would like to have one storage pool with multiple disks. Raid5 for metadata of course. But for user-data I would like to set the level of redundancy on a per file or per subvolume level. Can BTRFS ...
4
votes
1answer
410 views

Btrfs vs ext4 — Where's the safety break-even point?

Btrfs is still in heavy development and still considered "unstable" by Chris Mason, and many important features are still being added, but the dire warnings of data loss are calamity are long since ...
15
votes
8answers
2k views

Do snapshots + RAID count as a good on-site backup solution?

The two main reasons I can think of for taking backups seems to be taken care of when I use both snapshots and RAID together with btrfs. (By RAID here, I mean RAID1 or 10) Accidental deletion of ...
0
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1answer
682 views

btrfs: Looking for experience on btrfs error modes on bad sectors / read errors / medium erros

While running a Hadoop cluster that uses HDFS (so data is already replicated 3x) we experience often issues with ext4 because some bad sectors (the filesystem is unable to read or write to them) ...
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0answers
1k views

Preparing to use BTRFS in Debian 7 Wheezy

Kernel According to the BTRFS wiki support is green-lit for the 3.12 kernel, and neutral for the Wheezy kernel. I have installed the 3.12 kernel from wheezy-backports, so that I'm using a recommended ...
20
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6answers
9k views

Verify TRIM support with BtrFS on SSD

We are looking into using BtrFS on an array of SSD disks and I have been asked to verify that BtrFS does in fact perform TRIM operations upon deleting a file. So far I have been unable to verify that ...
0
votes
1answer
49 views

debian stable raid autogrow filesystem database

I need to setup a debian stable system meeting the following needs: Hard disks should be mirroring : Raid 1 Filesystem(s) should autogrow if possible (just in case we replace one hdd with a bigger ...
2
votes
1answer
359 views

XenServer Linux guest booting off iSCSI SAN (ZFS storage): Will a non-checksumming guest file system still be at risk?

We are storing files on FreeNAS 9.2 using ZFS. I love the data integrity claims made by ZFS, having randomly lost data in the past on servers using ext3, XFS, and ReiserFS that were not mistreated ...
4
votes
4answers
3k views

Does btrfs balance also defragment files?

When I run btrfs filesystem balance, does this implicitly defragment files? I could imagine that balance simply reallocates each file extent separately, preserving the existing fragmentation. There ...
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1answer
73 views

Can I mount a BTRFS snapshot of a live filesystem?

I wonder if it is possible to mount one or more snapshots of the same BTRFS filesystem for analytical purposes.