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2
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1answer
135 views

Mirror / backup laptop btrfs drive to sometimes connected external USB disk

I have a laptop with an internal drive using Btrfs. There are several subvolumes and snapshots on here. I want a copy of this drive to be made periodically to an external USB disk of approximately the ...
2
votes
1answer
192 views

/home “cleaned” during ubuntu 12.10 installation on btrfs

I had a seperate btrfs partition for my home directory in my old ubuntu instalation. I "upgraded" the installation by installing a clean system on my ext4 partition which got formatted and mounted as ...
2
votes
1answer
237 views

Replace Linux Boot-Drive | ext3 to btrfs

I've got a headless server running Debian Linux currently. Linux vault 3.2.0-3-686-pae #1 SMP Mon Jul 23 03:50:34 UTC 2012 i686 GNU/Linux The root filesystem is located on an ext3 partition on the ...
1
vote
1answer
52 views

Btrfs volume management for normal home user

Btrfs is by design for enterprise use, but that doesn't stop normal home users from using it. By normal home user, I mean those people who don't use complicated setup like mirroring, or any level of ...
1
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1answer
291 views

Finding files with BTRFS Uncorrectable Errors

I have a question concerning unrecoverable errors on a BTRFS file system. Specifically, I've run a BTRFS Scrub recently after experiencing a problem with one of my RAM sticks and it seems to have ...
1
vote
1answer
109 views

RAID 0 or btrfs on two SSDs?

I have two 500 GB SSD's, and I would like to combine the two in some way to have 1 250 GB NTFS partition, and 1 750 GB btrfs or ext4 partition. As far as I see, I have two options: the Intel Rapid ...
0
votes
1answer
40 views

btrfs convert from raid1 to raid5

Is it possible to easily convert a btrfs raid1 to a raid5. I mean at the end of the day. Its really just two mirrored drives. So I would think this should be easy to do. I want to now have 3 3TB ...
0
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1answer
138 views

btrfs check: “Couldn't open file system”

When I run btrfs check /dev/sda1, it returns "Couldn't open file system," whether /dev/sda1 is mounted or not. Why? (cf. this)
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1answer
55 views

how to delete btrfs snapshot?

sudo btrfs subvolume show / outputs / Name: @ uuid: 1f0da442-cdf3-144c-a4ce-f6c06248cfde Parent uuid: - Creation time: 2014-08-16 19:06:51 Object ...
0
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1answer
3k views

ext4 vs btrfs performance on SSD array

I am observing something that I cannot explain. I am trying to come up with a good filesystem configuration using HP P420i controller and SSDs. Out of curiosity I have tried BTRFS (still unstable so I ...
0
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1answer
96 views

How do I deal with BTRFS raid1 when usb disk device mappings changes?

I created a btrfs raid1 one by using "mkfs.btrfs /dev/sdc1 /dev/sdg1". It worked fine but next time I restarted my pc it seemed like the sdg device became sdf therefor btrfs refused to mount this ...
3
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0answers
477 views

Is it safe to resize a BTRFS partition that is part of a multi-device volume?

I have a multi-device BTRFS volume and I would like to re-size one of the partitions. To be more precise: My /home is spread across two separate BTRFS partitions. I shrunk down another partition to ...
2
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0answers
112 views

btrfs does not show drive as missing

I am trying out btrfs and I noticed some funny behaviour: I have two drives in a raid 1 configuration. sudo btrfs fi show Label: none uuid: 52b9c6f6-ce5c-4727-861e-e2fd012e475f Total devices 2 ...
2
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0answers
96 views

Btrfs snapshot space and time overhead

Using btrfs-snapshot-rotation, I've setup a system to rotate snapshots so that it always has snapshots of: Each of the the last 24 hours Each of the last 30 days Each of the last 12 months. This ...
2
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0answers
84 views

For raid1, does btrfs check which partitions are on the same device?

I have btrfs on two partitions using btrfs's raid1 mode: /dev/sda3 /dev/sdb3 Now I plan to run btrfs device add /dev/sda2 /dev/sdb2, so I'll have four partitions: /dev/sda2 /dev/sda3 /dev/sdb2 ...
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0answers
23 views

Understanding metadata usage behavior in a newly converted btrfs filesystem

I have a 5 TB hard drive with 3.3 TiB (as reported by du) of media files in 119k files and directories; the average file size was about 28 MiB. I converted the ext4 partition into btrfs with ...
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0answers
89 views

Online Drive Replacement: BTRFS with RAID 6

on a testing machine I installed four HDDs and they are configured as RAID6. For a test I removed one of the drives (/dev/sdk) while the volume was mounted and data was written to it. This worked ...
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0answers
161 views

Is it possible to convert a btrfs RAID5 to a RAID6 with the same disks without losing data?

How would I convert an existing RAID5 (single parity) btrfs setup to a dual parity RAID6 configuration given enough free available disk space, using the same disks, without swapping out data ? ...
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0answers
136 views

Linux kernel 3.9 new storage features howto?

Linux kernel 3.9 has been released, which brings new features for storage cache devices (dm-cache), as well as BTRFS RAID 5/6. These features are undoubtedly sexy, but are all but completely ...
1
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0answers
215 views

Ubuntu 12.04: Does grub support multidevice boot from btrfs?

I'm using Ubuntu 12.04 LTS (Precise Pangolin) with grub 1.99. I installed on a RAID10 multidevice BTRFS partition. I thought that multidevice support had been included in grub for a while, but on ...
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0answers
11 views

How does btrfs scrub work and what it does

What exactly btrfs scrub does? According to the manual page which is totally unclear it does some error checking? What kind of error checking? How much reliable it is? Is it able to recover some ...
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0answers
9 views

Is a btrfs RAID1 mountable if the added device isn't available/offline/failed/degraded?

Assume I created a RAID1 with btrfs's functions (btrfs device and btrfs balance subcommands instead of mdadm) like so: btrfs device add /dev/sdxZ /dev/sdxY btrfs balance start -dconvert=raid1 ...
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0answers
8 views

Is there a difference between writing to a btrfs snapshot or to its original?

After creating a btrfs subvolume produces two directories (one representing the subvolume, the other the writable snapshot). When writing to one of them, the changes are not reflected in the other, so ...
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0answers
37 views

After a crash computer will not boot with btrfs drive

So since I started using btrfs, when my computer crashes (mainly because battery ran out but on any crashe i had up until now) it does not boot anymore (the issue seems that the kernel cannot mount ...
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30 views

Please help me understand my Btrfs system status

My system is Ubuntu 64bit, updated. I have a btrfs file system, consists two disks. btrfs fi show: ➜ ~ sudo btrfs fi show Label: none uuid: 75a8f1e7-7d79-4a05-8f88-fe02d119bf9f Total ...
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0answers
12 views

Error when installing BURG on BTRFS

I can't seem to install BURG on BTRFS. I get the error: /usr/bin/burg-probe: error: cannot find a device for /boot/burg (is /dev mounted?)
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37 views

How many volumes should I add in my btrfs?

How much overhead does a single physical partition add to a btrfs volume? ps aux | grep btrfs | wc -l results in 102. I have 4TBx4 in my NAS and 16GB RAM and Core i3 processor. The NAS also hosts a ...
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0answers
23 views

Files in $HOME losing executable bit

On my laptop running Arch, I have a bunch of git repositories cloned under ~/git. My problem is that from time to time (maybe once in a month or so), all the executable files inside the clones will ...
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0answers
37 views

Path `/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting

Whenever I try updating grub, I get this error: # grub-install /dev/sda Path `/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting. and # grub-mkconfig -o ...
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0answers
16 views

BTRFS & F2FS userspace utilites cross compilation

Is there any weblink/document which describes the steps to cross-compile btrfs & F2fs user space utilities ? Any steps ? special tuning suggestion for arm based board.(AM335x) ?
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28 views

What are btrfs snapshot and subvolume restrictions speaking in terms of read/write access instead of access and data sharing?

The btrfs subvolume manpage tries to explain which type of access is granted to btrfs subvolumes and snapshots. Unfortunately it exclusively uses terms like "access", "use just like a directory" and ...
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0answers
11 views

btrfs device total usage differs from the sum of each usage

My system lays on a btrfs with 3 disks. btrfs fi show outputs: Label: none uuid: 75a8f1e7-7d79-4a05-8f88-fe02d119bf9f Total devices 3 FS bytes used 14.84GiB devid 1 size 7.74GiB used ...
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0answers
18 views

How to figure out which partition number an entry in the list has in the Fedora 20 installation routine?

I started the Fedora 20 installation image which I dded onto an USB stick. During the installation I started wondering whether it really is impossible to determine the parition number or UUID of ...
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0answers
71 views

It is possible to minimize size of a btrfs sparse file with btrfs filesystem resize and truncate?

Motivation: Assume I have created an oversize sparse file with truncate -s 4T test.img, mounted it over a loop device and put inside 1M files with 100 GB size together. One can assume that btrfs put ...
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0answers
70 views

BTRFS multiple devices mix raid1 and raid0

Hi Consider the following use case: I have two disks same size (let's say 3TB each). Then create a btrfs filesystem using both devices. Now I want to have two subvolumes "idata" and "ndata". Where ...
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0answers
26 views

Are re-combined BTRFS incrementals identical to the original?

I have several systems running btrfs, and I'd like to use the btrfs subvolume send/receive features as a backup solution. I want to send daily incrementals to remote as efficiently as possible. That ...
0
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0answers
123 views

btrfs made linux kernal panic when i delete subvolume?

My environment is: VMware workstation 8 CentOS 6.3, kernel 2.6.32-279.el6.i686 Btrfs v0.19 Sorry i can't use the images for the panic because my reputation is low. Call Trace ? panic ? oops_end ? ...