similar to: [Question] How to restore btrfs raid0 image file?

How can I verify the read speed of a btrfs raid0 pair in archlinux.? I assume raid0 means striped activity in a paralleled mode at lease similar to raid0 in mdadm. How can I measure the btrfs read speed since it is copy-on-write which is not the norm in mdadm raid0.? Perhaps I cannot use the same approach in btrfs to determine the performance. Secondly, I see a methodology for raid10 using

Observed on Linux 3.2.9 after the controller/disk flaked in-out. (The world still needs a SCSI error decoding tool to tell normal people what cmd and res are about.) [ 157.732885] device label srv devid 4 transid 11292 /dev/sdf [ 157.733201] btrfs: disk space caching is enabled [ 172.936515] device label srv devid 4 transid 11292 /dev/sdf [44106.091461] ata4.01: exception Emask 0x0 SAct 0x0

I have two disks that I formatted as btrfs RAID0 on opensuse 11.3. The raid worked well several days until there was a power surge. The system successfully rebooted and the btrfs raid reappeared, but the kernel occasionally threw oops. That was my first experience with oops. After two days, the btrfs raid failed to mount via fstab and when I manually tried to mount it, there was a kernel

Hi there... I have kernel version 2.6.36.3, compiled with gcc 4.4.5, btrfstools version 0.19+20101101 I have a btrfs filesystem (/data) consisting of two 1TB hard disks, raid0. I added in another 1TB hard drive. root@X86-64:~# btrfs filesystem show failed to read /dev/sdh failed to read /dev/sdg failed to read /dev/sdf failed to read /dev/sde failed to read /dev/sr0 failed to read /dev/fd0u800

I noticed that if I have single-device allocation for data in a multi-device btrfs filesystem, a balance operation will convert the data to RAID0. This is true even if ''-d single'' is specified explicitly when creating the filesystem. Then it wants to continue using RAID0 for future data allocations, and I run out of space once there''s no longer two drives with space

- RAID10 btrfs volume consisting of 4 disks. - One disk failed, was replaced, resync started (`btrfs dev add /dev/sdf /srv; btrfs dev del missing /srv`) - Another disk failed before resync was done. Disk was replaced, resync restarted. (`btrfs dev add /dev/sdc /srv; btrfs dev del missing /srv`) Naturally I don''t expect it to recover from 2 failures, but doing the attempt was

Did something break.. ? we are not reporting raid type after balance. ----------- # btrfs fi df /btrfs Data, RAID0: total=2.00GB, used=2.03MB Data: total=8.00MB, used=0.00 System, RAID0: total=16.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, RAID0: total=2.00GB, used=216.00KB Metadata: total=8.00MB, used=4.00KB # btrfs bal /btrfs Done, had to relocate 5 out of 5 chunks # btrfs fi

Signed-off-by: Matias Bjørling <m@bjorling.me> --- man/mkfs.btrfs.8.in | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/man/mkfs.btrfs.8.in b/man/mkfs.btrfs.8.in index 41163e0..db8c57c 100644 --- a/man/mkfs.btrfs.8.in +++ b/man/mkfs.btrfs.8.in @@ -37,7 +37,7 @@ mkfs.btrfs uses all the available storage for the filesystem. .TP \fB\-d\fR, \fB\-\-data

Hi all, I have two multi-disk btrfs filesystems on a Arch linux 3.4.0 system. After a power failure, both filesystems refuse to mount [ 10.402284] Btrfs loaded [ 10.402714] device fsid 1e7c18a4-02d6-44b1-8eaf-c01378009cd3 devid 4 transid 65282 /dev/sdc [ 10.403108] btrfs: force zlib compression [ 10.403130] btrfs: enabling inode map caching [ 10.403152] btrfs: disk space caching is

Add man/mkfs.btrfs.8.in Kept the name with the name in, so that further processing such as BUILD_DATE BUILD_VERSION etc. could be included later. All man pages included in the man directory to avoid file cluttering. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de> --- man/mkfs.btrfs.8.in | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 63 insertions(+), 0

Currently mkfs in response to mkfs.btrfs -d raid10 dev1 dev2 instead of telling "you can''t do that" creates a SINGLE on two devices, and only rebalance can transform it to raid0. Generally, it never warns users about decisions it makes and it''s not at all obvious which profile it picks when. Fix this by checking the number of effective devices and reporting back

I think I have some failing hard drives, they are disconnected for now. stan {~} root# btrfs filesystem show Label: none uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa Total devices 2 FS bytes used 6.27GB devid 1 size 9.31GB used 8.16GB path /dev/sde6 *** Some devices missing Label: none uuid: b142f575-df1c-4a57-8846-a43b979e2e09 Total devices 8 FS bytes used

If there is no free space, the free space allocator will try to get space from the block group with the degenerated profile. For example, if there is no free space in the RAID1 block groups, the allocator will try to allocate space from the DUP block groups. And besides that, the space reservation has the similar behaviour: if there is no enough space in the space cache to reserve, it will reserve

Hello, on a fs with 4 disks, raid 10 for data, one drive was failing and has been removed. After reboot and ''mount -o degraded...'', the fs looks full, even though before removal of the failed device it was almost 80% free. root@fs0:~# df -h /mnt/b Filesystem Size Used Avail Use% Mounted on /dev/sde 11T 2.5T 41M 100% /mnt/b root@fs0:~# btrfs fi df /mnt/b Data,

Hi Dongyang, Yan, When testing BTRFS with RAID 0 metadata on linux-3.3, we see discard ranges exceeding the end of the block device [1], potentially causing dataloss; when this occurs, filesystem writeback becomes catatonic due to continual resubmission. The reproducer is quite simple [2]. Hope this proves useful... Thanks, Daniel --- [1] attempt to access beyond end of device ram0: rw=129,

https://bugzilla.kernel.org/show_bug.cgi?id=66151 # btrfs scrub status / scrub status for 02184910-5849-489f-b970-3ea35912a7af scrub started at Tue Nov 26 21:30:01 2013, running for 15 seconds total bytes scrubbed: 5.38GiB with 0 errors # btrfs scrub cancel / ERROR: scrub cancel failed on /: not running # btrfs scrub resume / ERROR: scrub is already running. To cancel use

Hi all, I have a question about replacing a drive in raid10 (and linux kernel 3.8.4). A bad disk was physical removed from the server. After this a new disk was added with "btrfs device add /dev/sdg /btrfs" to the raid10 btrfs FS. After this the server was rebooted and I mounted the filesystem in degraded mode. It seems that a previous started balance continued. At this point I want to

Chris: I''m consistently getting oopses when running fsstress against both single and multiple device compressed btrfs filesystems using kernels built from the current btrfs-unstable. In this report, I''m describing an incident with a single device filesystem. Once the oops occurs, all I/O appears to stop though iowait is still reported, and fsstress does not make apparent

While untar''ing an image to an sd card via a reader, I got the following bug. The system also has a btrfs root, and a whole swath of processes went into uninterruptable sleep. I was able to poke around via ssh and sysrq, and already had netconsole set up to capture the bug. Root fs is on /dev/sdi1, and /dev/sdj2 is the card reader which was the target of the untar. [29571.448889] sd

Hallo, linux-btrfs, I''ve (once again) tried "add" and "delete". First, with 3 devices (partitions): mkfs.btrfs -d raid0 -m raid1 /dev/sdk1 /dev/sdl1 /dev/sdm1 Mounted (to /mnt/btr), filled with about 100 GByte data. Then btrfs device add /dev/sdj1 /mnt/btr results in # show Label: none uuid: 6bd7d4df-e133-47d1-9b19-3c7565428770 Total devices 4 FS bytes