Re: Why we always balance system chunk alone with metadata?

Qu Wenruo posted on Wed, 16 Mar 2016 10:48:48 +0800 as excerpted: > Hi, > > During debugging a bug related to balancing metadata chunk, we found > that if we specify -m option for "btrfs balance", it will always balance > system chunk too. > > cmds-balance.c: > --- > /* > *

Re: Major HDD performance degradation on btrfs receive

On Wed, Mar 16, 2016 at 5:53 AM, Austin S. Hemmelgarn wrote: > On 2016-03-16 02:51, Chris Murphy wrote: >> >> On Tue, Mar 15, 2016 at 10:23 PM, Nazar Mokrynskyi >> wrote: >>> >>> Sounds like a really good idea! >>> >>> I'll try to implement in in my

Re: [PATCH] btrfs-progs: add stat check in open_ctree_fs_info

Austin S. Hemmelgarn wrote on 2016/03/16 11:26 -0400: Currently, open_ctree_fs_info will open whatever path you pass it and try to interpret it as a BTRFS filesystem. While this is not nessecarily dangerous (except possibly if done on a character device), it does result in some rather cryptic

Re: recovery problem raid5

I try mount with -o degraded but this same effect what recovery: [ 7133.926778] BTRFS info (device sdc): allowing degraded mounts [ 7133.926783] BTRFS info (device sdc): disk space caching is enabled [ 7133.932140] BTRFS info (device sdc): bdev (null) errs: wr 921, rd 164889, flush 0, corrupt

Re: Blocks changed since previous snapshot of subvolume

sri posted on Fri, 18 Mar 2016 13:36:50 + as excerpted: > Henk Slager gmail.com> writes: > >> sri yahoo.co.in> writes: >> > >> > I Would like to know between 2 snapshots of a subvolume, can we >> > identify what all blocks modified particular to that subvolume ? >> > >> > there can be

[PATCH 2/5] btrfs-progs: "qgroup create/destroy" don't work

"qgroup create/destroy" don't work from the following commit. commit 176aeca9a148 ("btrfs-progs: add getopt stubs where needed") * actual result == # ./btrfs qgroup create 1 /btrfs/sub btrfs qgroup create: too few arguments usage: btrfs

Re: recovery problem raid5

The main thing you haven't tried here is mount -o degraded, which is the thing to do if you have a missing device in your array. Also, that kernel's not really all that good for a parity RAID array -- it's the very first one that had the scrub and replace implementation, so it's rather less

Re: btrfs error

Anyone? Would really appreciate a pointer or two! Thanks Paul On Tue, Mar 15, 2016 at 4:00 PM, Paul Harrison wrote: > Hi all, > > I'm new to btrfs, and have just taken over management of this system; can > anyone point me in the right direction with regard to the

Re: [PATCH][btrfs-progs] populate fs with small dataset for convert-tests

On Tue, Mar 08, 2016 at 08:30:06PM +0530, Lakshmipathi.G wrote: > + perm) > + for modes in $(seq 1 );do This generates way too many files, and is the longest part of image pupulation, given the number of option combinations of ext4 and btrfs, we need to keep

Btrfs progs pre-release 4.5-rc2

Hi, btrfs-progs 4.5-rc2 have been released. The changes in option parsing broke several commands, that's been fixed since rc1 but I'd rather give it some more time before 4.5 release. New ETA is this Sunday. Changes since rc1: * bugfixes * subvol sync: fix crash, memory corruption *

re: Btrfs: remove empty block groups automatically

Hello Josef Bacik, The patch 47ab2a6c6899: "Btrfs: remove empty block groups automatically" from Sep 18, 2014, leads to the following static checker warning: fs/btrfs/extent-tree.c:10584 btrfs_delete_unused_bgs() warn: 'ret' can be either negative or positive The warning here is

Re: [4.4.1] btrfs-transacti frequent high CPU usage despite little fragmentation

Duncan, thanks for your extensive answer. On 17.03.2016 11:51, Duncan wrote: > Ole Langbehn posted on Wed, 16 Mar 2016 10:45:28 +0100 as excerpted: > > Have you tried the autodefrag mount option, then defragging? That should > help keep rewritten files from fragmenting so heavily, at least.

Re: [RFC PATCH] btrfs/066: Fix race condition by making 'subvolume stress' task to exit gracefully

On Thu, Mar 17, 2016 at 11:44:29AM +0530, Chandan Rajendra wrote: > The following scenario can occur when running btrfs/066, > > Task ATask B Task C > > run_test() > - Execute _btrfs_stress_subvolume() > in a background shell. >

Blocks changed since previous snapshot of subvolume

Hi, I Would like to know between 2 snapshots of a subvolume, can we identify what all blocks modified particular to that subvolume ? there can be many subvolume and snapshots present on the btrfs but i want only blocks modified since first snapshot for the specific subvolume. blocks should

Re: [4.4.1] btrfs-transacti frequent high CPU usage despite little fragmentation

Ole Langbehn posted on Wed, 16 Mar 2016 10:45:28 +0100 as excerpted: > Hi, > > on my box, frequently, mostly while using firefox, any process doing > disk IO freezes while btrfs-transacti has a spike in CPU usage for more > than a minute. > > I know about btrfs' fragmentation issue, but have a

A good "Boot Maintenance" scheme (WAS: New file system with same issue)

On 03/14/2016 01:13 PM, Marc Haber wrote: This was not asked, and I didn't try. Since this is an encrypted root filesystem, is it a workable way to add clear_cache to /etc/fstab, rebuild initramfs and reboot? Or do you recommend using a rescue system? You should be able to boot to single user

Global hotspare functionality

Hi all, I try to get Anand's patchset for global hotspare functionality working. Now it's working for me but I have met number of issues while applying and patches testing. I took latest versions of patchset and its dependencies (latest at two weeks ago): 1) Anand's hotspare patchset:

Re: [4.4.1] btrfs-transacti frequent high CPU usage despite little fragmentation

Ole Langbehn posted on Fri, 18 Mar 2016 10:33:46 +0100 as excerpted: > Duncan, > > thanks for your extensive answer. > > On 17.03.2016 11:51, Duncan wrote: >> Ole Langbehn posted on Wed, 16 Mar 2016 10:45:28 +0100 as excerpted: >> >> Have you tried the autodefrag mount option, then defragging?

Re: recovery problem raid5

On Fri, Mar 18, 2016 at 12:02 PM, Hugo Mills wrote: >The main thing you haven't tried here is mount -o degraded, which > is the thing to do if you have a missing device in your array. > >Also, that kernel's not really all that good for a parity RAID > array -- it's the

Re: Snapshots slowing system

Austin S. Hemmelgarn posted on Fri, 18 Mar 2016 07:38:29 -0400 as excerpted: >>> 188 Command_Timeout 0x0032 100 099 000Old_age >>> Always >>>- 8590065669 >> >> Again, a non-zero raw value indicating command timeouts, probably due >> to those bad seeks. It'll

Re: Snapshots slowing system

On 2016-03-15 18:29, Peter Chant wrote: On 03/15/2016 03:52 PM, Duncan wrote: Tho even with autodefrag, given the previous relatime and snapshotting, it could be that the free-space in existing chunks is fragmented, which over time and continued usage would force higher file fragmentation

Re: Snapshots slowing system

On 03/18/2016 11:38 AM, Austin S. Hemmelgarn wrote: > This one is tricky, as it's not very clearly defined in the SMART spec. > Most manufacturers just count the total time the head has been loaded. > There are some however who count the time the heads have been loaded, > multiplied by the

Re: recovery problem raid5

On Fri, Mar 18, 2016 at 05:31:51PM -0600, Chris Murphy wrote: > On Fri, Mar 18, 2016 at 12:02 PM, Hugo Mills wrote: > >The main thing you haven't tried here is mount -o degraded, which > > is the thing to do if you have a missing device in your array. > > > >Also, that

Re: Snapshots slowing system

Austin S. Hemmelgarn posted on Fri, 18 Mar 2016 14:54:54 -0400 as excerpted: > As of right now, the top three brands of SSD as far as quality IMHO are > Intel, Samsung, and Crucial. I usually go with Crucial myself because > they are almost on-par with the other two, give more deterministic >

Re: Snapshots slowing system

Pete posted on Fri, 18 Mar 2016 18:16:50 + as excerpted: > On 03/18/2016 09:17 AM, Duncan wrote: >> So btrfs raid1 has data integrity and repair features that aren't >> available on normal raid1, and thus is highly recommended. >> >> But, raid1 /does/ mean two copies of both data and

Re: btrfs error

Paul Harrison posted on Fri, 18 Mar 2016 10:25:44 + as excerpted: > Anyone? Would really appreciate a pointer or two! I was hoping someone, presumably a dev with understanding of the code, would reply here, as I'm just an admin-level list regular who uses btrfs on my own machines and helps