similar to: writes got stuck

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 All, I believe that I can pretty reliably reproduce the BUG mentioned in the attached dmesg output. (This doesn''t mean that you can, but I''ll detail what I''ve done here.) [This BUG is the same one that I reported last night.] 1) Create a 2 GB dynamically expanding disk. 2) Attach it to a VirtualBox machine. 3) Start the

Hello I think, I somewhat destroyed my btrfs filesystem on my Ubuntu 13.04 kernel 3.8.0-25-lowlatency system. It got destroyed, because the system was hanging for some other reason and I had to remove power... When I try to mount my filesystem (there''s only one, with a few subfilesystems), the system crashes. Also btrfsck dies; always like this: a@ask-home:~$ sudo

Hello, I''m currently trying to understand how compression in btrfs works. I could not find any detailed description about it. So here are my questions. 1. How is decided what to compress and what not? After a fast test with a 2g image file, I''ve looked into the extents of that file with find-new and it turned out that only some of the first extents were compressed. The file was

What are the recommendations for running KVM images on BTRFS systems using kernel 3.4?  I saw older posts on the web complaining about poor performance, but I know a lot of work has gone into btrfs since then.  There also seemed to be the nocow option, but I didn''t find anything that said it actualy helped. Anybody have ideas? Thanks, Matt -- To unsubscribe from this list: send the line

Hi! I used to have arch linux running on 1 btrfs partition (sda1, incl. /boot). When switching to 3.2.5 recently the system fails to boot: (after udevd) /etc/rc.sysinit: line 15: 117 Bus error mountpoint -q /proc and so on, no idea. It used to boot with 3.2.4, but 1) I obviously had some corruption in the tree, when I tried to delete a certain file I hit e.g. "kernel BUG at

(I'm doing tests in a VirtualBox instance, so take this with a grain of salt.) If you give the VM only 512 MB of RAM, the text-mode installer kicks in. It does not prompt you to configure anything related to the network or hostname. The system boots up without a network interface configured. Also, it won't let you choose the install mode, I guess it defaults to Minimal (which is fine

Hi - I''m trying btrfs with kernel 2.6.38.8-32.fc15.x86_64 (a Fedora kernel). I''m just doing a tar-to-tar copy onto the file system with compress- force=zlib. Here are some traces of the stuck processes. flush-btrfs-5 seems to be stuck: Jul 8 11:49:40 xback2 kernel: [74920.681032] flush-btrfs-5 D ffff88003c7bae60 0 11712 2 0x00000080 Jul 8 11:49:40 xback2 kernel:

Hi, I have btrfs volume, shared via samba. I have a directory of documents that I want to backup on my server. win7 reports a maximum of ~3.10MB/s transfer transferring the same directory on a ext4 samba share I get 25MB/s + Any ideas? Is it like that because of how btrfs works and is setup? Thanks, -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body

Hello folks, I reported a bug here: https://bugzilla.kernel.org/show_bug.cgi?id=63071 but I am not sure if that was the right thing to do. This is producing OOM issues and leading to system crashes (including eventual panics) with such alarming frequency that I wonder if perhaps there is something different about my setup than others. In a nutshell, I originally made the mistake of storing a

Hi list, I have a few large image files (VMware workstation VMDKs and TrueCrypt containers) which I routinely back up over the network to a btrfs raid10 volume via bigsync (https://code.google.com/p/bigsync/). The VM images in particular get really fragmented due to CoW, which is expected. I haven''t yet switched off CoW on the backups directory mainly to experiment and see what

Hello, A college friend of mine is using Debian Linux on his desktop, and wondered if he could tap into ZFS goodness without adding another server in his small quiet apartment or changing the desktop OS. According to his research, there are some kernel modules for Debian which implement ZFS, or a FUSE variant. Can anyone comment how stable and functional these are? Performance is a

I noticed a huge problem with the free space cache that was presenting as an early ENOSPC. Turns out when writing the free space cache out I forgot to take into account pinned extents and more importantly clusters. This would result in us leaking free space everytime we unmounted the filesystem and remounted it. I fix this by making sure to check and see if the current block group has a cluster

Hello, is it possible to set nodatacow on a per-file basis? I couldn''t find anything. If not, wouldn''t that be a great feature to get around the performance issues with VM and database storage? Of course cloning should still cause COW. Thanks, Ralf-Peter -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to

I have been experimenting exporting btrfs subvolumes over nfs. Main subvolume is filesys1 mounted at /filesys1. Below this is subvolume base, user1 is in base and documents is in user1. documents is mounted at /documents. /etc/exports is: /filesys1/base/user1 172.16.0.0/24(rw,no_acl,no_root_squash,fsid=0) /filesys1/user1-snapshot 172.16.0.0/24(rw,no_acl,no_root_squash,fsid=0)

Hi, While updating my fedora rawhide installation, I got the Ooops listed at the end of the Email. Is this a known bug (I didn''t find anything specific), or should I file a bug? Thank you in advance, Clemens Feb 10 10:59:45 testbox kernel: [ 524.495751] BUG: unable to handle kernel NULL pointer dereference at (null) Feb 10 10:59:45 testbox kernel: [ 524.496006] IP:

When data in a file is overwritten, starting somewhere in the middle of the file, the overwritten space is counted twice against the space usage numbers. Is this a bug, or did I something wrong? This is what I did: I create a subvolume and limit it to 4 MB, and create a 1000 KB file in the subvol: # btrfs subvol create s Create subvolume ''./s'' # btrfs

Hello, testing the localboot stuff I figured out that I'm unable to pxe-boot virtualbox with pxelinux 5.0 at all. Everything works fine in 4.05 though. This is virtualbox 4.1.18 from debian wheezy emulation a PCnet-Fast III Network Interface because the default emulated card from Intel does not support PXE in virtualbox. Sven -- "and on the third day he rebooted into

Hi folks! Been using btrfs for quite a while now, worked great until now. Got power-loss on my machine and now i have the "parent transid verify failed on X wanted X found X" problem. So I can''t get it to mount. My btrfs is spread over sda (2tb), sdc(2tb), sdd(1tb). Is this something that an offline fsck could fix ? If so is the fsck-util being developed ? Is there a way to

Hi, Recently, I made a btrfs to use. And I met slowness problem. Trying to diag it. I found this: 1. dd if=/dev/zero of=test count=1024 bs=1MB This is fast, at about 25MB/s, and reasonable iowait. 2. dd if=/dev/zero of=test count=1 bs=1GB This is pretty slow, at about 1.5MB/s, and 90%+ iowait, constantly. May I know why it works like this? Thanks. -- To unsubscribe from this list: send the

Hi all, we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn''t read all the during the writes. Is this a known issue? This is with linux-3.9.2. Thanks, Bernd -- To unsubscribe from this list: send the line