A copy-on-write (COW) file system developed by Oracle included in the Linux kernel.
9
votes
1answer
116 views
How to make a btrfs snapshot writable?
According to the btrfs Readonly snapshots patch it's possible to "set a snapshot readonly/writable on the fly." So I should be able to turn my readonly snapshot (created with btrfs snapshot -r) ...
2
votes
0answers
14 views
What privileges are needed to delete a read-only btrfs subvolume?
I want to delegate non-root user to delete read-only subvolumes (snapshots).
What exactly capabilities/rights I need to grant, so that he can remove his own read-only snapshots?
I've already ...
1
vote
0answers
52 views
Docker - Force to Use AUFS Instead of BTRFS
I am having significant problems using Docker on my BTRFS filesystem, and I suspect that is due to a lack of stability with the BTRFS driver. I would rather figure out how to switch the fs driver than ...
1
vote
0answers
32 views
Recover data from a BTRFS RAID5
I have a BTRFS RAID5 setup (no mdadm) with four disks (the fifth failed). Now I am trying to recover the files but as soon as I try to rsync the files over to another disk, the system hangs after ...
9
votes
1answer
50 views
Limit on the number of btrfs snapshots?
I am considering using btrfs on my data drive so that I can use snapper, or something like snapper, to take time based snapshots. I believe this will let me browse old versions of my data. This would ...
1
vote
1answer
44 views
How reliable is (or will be) btrfs send/receive?
We have at work a 15TB NFS file server using XFS, with a distant clone for backups using rsync, over a moderately slow connection (100Mb ethernet).
We are now thinking about using btrfs instead of ...
3
votes
1answer
39 views
Get device with major number 0 (btrfs subvolume)
When I stat a file on a btrfs subvolume I get a major device number of 0.
Is there a reliable way to find the mount point of this device, without knowing in advance it is a btrfs subvolume?
e.g. I'd ...
0
votes
1answer
34 views
btrfs confused about subvolumes
I'm starting out with btrfs on my embedded Linux system. My system currently has a single SD card used for the rfs.
What I'd like to do is have a way to snapshot both the system files (currently ...
1
vote
1answer
68 views
What actually happens when the checksum fails for a file using btrfs?
I'm testing using btrfs on my embedded Linux system. It uses a uSD card for the rfs. This system is remotely deployed so there's no human sysadmin to take care of it. My question is what happens ...
0
votes
1answer
27 views
btrfs snapshots without subvolumes?
I'm starting to use btrfs. I want to be able to snapshot certain directories but do not want to create sub-volumes. Is this possible?
2
votes
1answer
81 views
btrfs on SD card, what does “Btrfs detected SSD devices, enabling SSD mode” mean exactly?
I'm experimenting with using btrfs on my Debian Linux armhf system. The rfs is on a micro SD card. On bootup I get the message "Btrfs detected SSD devices, enabling SSD mode". What features does ...
0
votes
2answers
48 views
Shrink btrfs from /dev/sda to /dev/sda1
suppose I have 2 btrfs filesystems:
one mounted on /mnt/big spanning across /dev/sda /dev/sdb /dev/sdc /dev/sdd
the other mounted on /mnt/small on a single drive: /dev/sde
How would I shrink the ...
2
votes
2answers
65 views
Error when creating BTRFS Filesystem
I'm attempting to install Arch Linux using the btrfs filesystem. I'm at the beginning of the install processes preparing my drive and I'm hitting an issue.
Firstly I begin to clear any GTP and MBR ...
1
vote
1answer
89 views
How to find data copies btrfs
I have deduplicated my btrfs filesystem with bedup, so now all duplicate files (above a certain size) are "reflink" copies.
Is there any way to see, given a filename, what other files are the same ...
1
vote
1answer
66 views
ex4 to btrfs conversion: If I accidentally lose power to the system during the conversion, will I lose the data?
I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the risks involved in the process.
If I accidentally lose power to the system during the conversion, will I ...
1
vote
0answers
21 views
ext4 to btrfs conversion: Can I pause, reboot the system and then resume the conversion? [duplicate]
I want to convert a rather big ext4 volume into btrfs. How long will the process will take?
1
vote
1answer
53 views
ext4 to btrfs conversion: how many times the whole volume will be read during the process?
I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the time it will take. I understand that this process is disk-bound rather then cpu- or memory-bound. So can ...
1
vote
0answers
28 views
btrfs partition not detected
I have some distros installed on a BTRFS partitions under different subvolumes ( for distro-hopping, separate ext4 boot). This btrfs partition is now not getting detected on boot, while I can access ...
5
votes
1answer
273 views
How to use btrfs send/receive for transmitting backup snapshots over a slow and unreliable network connection?
I'd like to use btrfs' send/receive feature for transmitting backup snapshots over a rather slow (initial seed of about 50-100GB, upstream bandwith ~1-2MBit/s) and unreliable (daily forced ...
5
votes
2answers
308 views
Arch does not mount btrfs array on boot
As data partition I have a multi-disk btrfs filesystem. My root disk is ext4
Fstab:
UUID=290624c6-6b95-41fd-94a1-923ebca64b83 / ext4 rw,relatime,data=ordered 0 1
/dev/sdc ...
5
votes
1answer
89 views
Is there any way in BTRFS to set compression permanently?
I have a USB HDD.
I want to mount it with compression enabled. I can do in the fstab of my system or even using udev rules. The problem is that I won't mount my USB HDD on my computer only. Up to ...
1
vote
0answers
22 views
Encrypted file system on external storage [duplicate]
I use archlinux and manjaro. I recently bought an external 2TB toshiba stor.E canvio, and I planned to use it as back up. I used gpt layout and partitioned it with luks and ext4. Dolphin reports 6% ...
1
vote
0answers
41 views
What are the linux kernel versions incompatibilities with btrfs?
I read that usage of a btrfs volume with a newer kernel can render it unreadable when that same volume is used with an older kernel. I have a mobile storage device that will be used by different linux ...
2
votes
1answer
235 views
Access files from BTRFS image on similar filesystem
Backgroud: Running XBian (Debian ARM distribution for Raspberry Pi), which uses BTRFS. I fragged my system and decided to start over. However, I ripped the image from the root filesystem device before ...
1
vote
1answer
578 views
Is there a way to monitor progress of a btrfs rebalance?
I'm replacing a failed harddrive in a mirrored btrfs.
btrfs device delete missing /[mountpoint] is taking very long, so I assume that it's actually rebalancing data across to the replacement drive.
...
0
votes
3answers
241 views
How are filesystem snapshots different from simply making a copy of the files?
by doing this,
# btrfs subvolume snapshot /mnt/1 /mnt/1/snapshot
# tree /mnt/1
/mnt/1
├── a
├── snapshot
│ ├── a
│ └── subv
└── subv
└── b
3 directories, 3 files
We can create snapshot ...
3
votes
1answer
189 views
Running du command reports infinity as disk usage
I'm trying to get the total size of what's stored in my home directory. To my surprise, it reports infinity after a few seconds:
/home/user $ du -sh .
Infinity
Huh? I'm pretty sure there are no ...
1
vote
0answers
100 views
Understanding btrfs disc usage for single data volume
On my 256 GB disc:
# btrfs fi show /dev/sdd3
Total devices 1 FS bytes used 143.43GiB
devid 1 size 234.22GiB used 234.22GiB path /dev/sdd3
Btrfs v3.12
I don't understand the discrepancy between ...
3
votes
0answers
144 views
LXC with both GUI apps and snapshots on unmodified Fedora kernel
I am looking for a tool or library to run LXC that supports:
running X applications
conveniently snapshotting root filesystems (using a Fedora system with an unmodified kernel), so that I don't have ...
5
votes
2answers
391 views
Modifying a BTRFS filesystem UUID
I've made backups of my BTRFS filesystem using Clonezilla, and have restored one of those backups to a file named 2013-11-29.sda3.img.
I need to get some files out of this backup, but there's a ...
2
votes
1answer
476 views
Boot partiotionless disk with syslinux
A file system can be configured to span a complete disk, omitting any partition table. Notice intentionally the command to do so does not use /dev/sda1 but the raw, unpartitioned device instead.
...
1
vote
1answer
129 views
strange directories on ubuntu 13.10 btrfs partition
I am running Ubuntu 12.04 (ext4) and installed Ubuntu 13.10 on a partition of its own (sda2) with btrfs. I had no time to configure 13.10 to my work environment (yet), so I mounted /dev/sda2 from ...
2
votes
0answers
127 views
What's status of btrfs as root fs? [closed]
What is the current status of btrfs being the root filesystem including /boot; meaning that you do not need to create a separate /boot partition.
I ask because I noticed on Debian 7 you cannot setup ...
0
votes
1answer
80 views
btrfs: mismatching generation and generation_v2 found in root item
I am seeing this message in dmesg:
btrfs: mismatching generation and generation_v2 found in root item
I found a related question here: Understanding btrfs dmesg
However, unlike that question, I ...
2
votes
1answer
424 views
How to delete btrfs subvolumes with <FS_TREE> in their name
I have a bunch of btrfs snapshots like so:
20:17:37 [root@galaxy /]$ btrfs subvolume list -a / |grep apt
ID 271 gen 348 top level 5 path <FS_TREE>/@apt-snapshot-2013-04-17_21:44:30
ID 272 gen ...
0
votes
0answers
448 views
Install Zentyal 3.2 on btrfs with raid 1 and luks
I want to install Zentyal 3.2 with btrfs, raid1 and luks on a server with 3 harddrives.
at first i created 2 partitions on each device (sda,sdb,sdc). the first with 1G, and the secound with the rest. ...
2
votes
1answer
163 views
Linux btrfs how to remove unexistent filesystem from list?
I'm giving a try to btrfs. As newbie I did some mistakes, which are good for learning!
I created several btrfs filesystems upon different devices (sdX, loop, lvm, etc). During these tests, I removed ...
5
votes
3answers
535 views
Why can't a regular user delete a btrfs subvolume
Using a loop-mounted user created btrfs filesystem, with the permissions set correcly, a user is able to freely create btrfs subvolumes:
user@machine:~/btrfs/fs/snapshots$ /sbin/btrfs sub create ...
2
votes
1answer
311 views
btrfs, infamous ENOSPC error while doing a backup from a snapshot
My system is Fedora 19 x86_64 w/3.10.7 kernel.
I am trying to use a btrfs snapshot for backing up my /, like this:
#!/bin/bash
btrfs subvolume snapshot / /snap/
tar -cvf - /snap 2>/dev/null | ...
2
votes
0answers
280 views
System cannot boot, continiously scanning btrfs filesystem
On the previous boot I installed HAL to make amazon prime video streaming work, which it did (mostly), but after reboot the system could not pull itself up all the way to BASH and drops to a failed ...
1
vote
1answer
102 views
Does a high “used” value for a device in “btrfs filesystem show” pose a problem? Should a balance operation be performed?
I have a laptop with a Samsung 840 500 GB SSD, and I've installed openSUSE 12.3 with btrfs as the filesystem.
A few days ago I first got a message from my web browser about it not being able to save ...
3
votes
1answer
453 views
Understanding btrfs dmesg
Based on the documentation I found at https://btrfs.wiki.kernel.org/index.php/Data_Structures I am strugeling to understand the following dmesg
[ 173.946830] device fsid ...
2
votes
1answer
420 views
Can btrfs handle different RAID levels for different subvolumes?
I'd like to assign different RAID levels to different subvolumes in my btrfs filesystem, eg have a subvolume /home that uses RAID 1 and a subvolume /var that uses RAID 0. Is that at all possible (if ...
7
votes
2answers
774 views
Why is cp --reflink=auto not the default behaviour?
Why is cp --reflink=auto not the default behaviour? Could it cause any harm to enable it?
Is it possible to enable it at compile time, so it is used all across the system, not just in interactive ...
3
votes
0answers
263 views
btrfs change after system upgrade broke apt-btrfs-snapshot
After upgrading (via apt-get dist-upgrade) a Mint 14 Linux box to Mint 15, apt-btrfs-snapshot seems to have stopped working:
18:25:48 [root@galaxy ~]$ apt-btrfs-snapshot list
Sorry, your system lacks ...
6
votes
3answers
3k views
How to get rid of the “scanning for btrfs file systems” at start-up?
After upgrading from Ubuntu 12.04 to Ubuntu 12.10, 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.
How ...
5
votes
1answer
594 views
btrfs and the discard mount option on an ssd
I can't seem to find an answer to this so I thought I would ask here:
In /etc/fstab and when using the mount command in ext4 you would add the option discard to activate TRIM on an SSD. Similarly ...
1
vote
1answer
145 views
Deleting files on btrfs through smb
I have set up a btrfs multidisk which I mount and have shared on the network through smb. Whenever someone deletes a file on the share in windows, it seems to be rather slow. Any ideas/options I need ...
3
votes
0answers
352 views
Compiling and running Snapper for Ubuntu
I am trying to get snapper working in my Mint 14. (The version from launchpad is old and not compatible with Ubuntu 12.10. The OpenSuSe's build project failed to build it, too). So I try my luck with ...
3
votes
1answer
168 views
Equivalent of pvmove for BTRFS
Similar to the question I asked a while back. This one's a little easier? I can see there's volume management logic in BTRFS for removing/adding/rebalancing physical drives, but is there a tool to ...
