From 2de353ddda78ef5cbc84e1d3267606bc44e48faa Mon Sep 17 00:00:00 2001
Message-Id:
2de353ddda78ef5cbc84e1d3267606bc44e48faa.1289589812.git.h...@carfax.org.uk
From: Hugo Mills h...@carfax.org.uk
Date: Sat, 6 Nov 2010 00:18:12 +
Subject: [PATCH] Clean up typography in the man pages.
To: linux
From 2de353ddda78ef5cbc84e1d3267606bc44e48faa Mon Sep 17 00:00:00 2001
Message-Id:
2de353ddda78ef5cbc84e1d3267606bc44e48faa.1289589812.git.h...@carfax.org.uk
From: Hugo Mills h...@carfax.org.uk
Date: Sat, 6 Nov 2010 00:18:12 +
Subject: [PATCH] Clean up typography in the man pages.
To: linux
trfs/msg44089.html
Hugo.
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: device fsid
5b4be7c4-e662-459a-a2a7-066e9384c901 devid 1 transid 4 /dev/loop1
At a guess, two of those are probably from btrfs dev scan triggered
by udev.
Hugo.
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On Thu, May 09, 2013 at 12:37:38PM +0200, Toralf Förster wrote:
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On 05/09/2013 12:04 PM, Hugo Mills wrote:
At a guess, two of those are probably from btrfs dev scan
triggered by udev.
Those messages do only appear for a btrfs, not if I choose
for you?
The message is informational and doesn't indicate any kind of issue
with the FS. I'd just ignore it/them.
(Also, are you running btrfs dev scan beforehand or not? It'd be
interesting to see the difference in your logs -- particularly with
timestamps -- when you do that.)
Hugo
balance with target data profile 128
Isn't it possible to convert raid level to raid5?
Yes, it should be possible. It looks like the kernel's got a
problem with it, which is odd because 3.9 should know about RAID-5.
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net
got into 3.10.
Hugo.
Thanks for the help,
Marcus
2013/5/10 Remco Hosman - Yerf IT re...@yerf-it.nl
On May 10, 2013, at 10:21 PM, Hugo Mills h...@carfax.org.uk wrote:
On Fri, May 10, 2013 at 10:07:56PM +0200, Marcus Lövgren wrote:
Hi list,
I am using kernel 3.9.0, btrfs
?
It's just information about a clean-up. Totally harmless.
Hugo.
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--- Happiness is mandatory. Are you happy
, so right now I wouldn't recommend using them for
anything other than for testing purposes with data that's replacable.
Hugo.
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storage.
HTH,
Hugo.
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On Sun, Jun 02, 2013 at 05:52:38PM +0100, Tim Eggleston wrote:
Hi Hugo,
Thanks for your reply, good to know it's not an error as such (just
me being an idiot!).
Additional space will be allocated from the available unallocated
space as the FS needs it.
So I guess my question becomes
consumption of raid1. So no matter how you slice it, it's confusing.
It's the nature of the beast, unfortunately. So far, nobody's
managed to come up with a simple method of showing free space and
space usage that isn't going to be misleading somehow.
Hugo.
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to the device. If that happens and then the power gets
cut before the rest of the data can be written, you have a corrupt
filesystem.
Hugo.
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to copy some heavily hardlinked backups from ReiserFS,
I've seen:
The following block rsv returned -28 is repeated 7 times until there
is a call trace for:
This is ENOSPC. Can you post the output of btrfs fi df
/mountpoint and btrfs fi show, please?
Hugo.
WARNING: at fs/btrfs/super.c
On Wed, Jun 05, 2013 at 04:28:33PM +0100, Martin wrote:
On 05/06/13 16:05, Hugo Mills wrote:
On Wed, Jun 05, 2013 at 03:57:42PM +0100, Martin wrote:
Dear Devs,
I have x4 4TB HDDs formatted with:
mkfs.btrfs -L bu-16TB_0 -d raid1 -m raid1 /dev/sd[cdef]
/etc/fstab mounts
On Wed, Jun 05, 2013 at 04:59:57PM +0100, Martin wrote:
On 05/06/13 16:43, Hugo Mills wrote:
On Wed, Jun 05, 2013 at 04:28:33PM +0100, Martin wrote:
btrfs fi df:
Data, RAID1: total=2.85TB, used=2.84TB Data: total=8.00MB,
used=0.00 System, RAID1: total=8.00MB, used=412.00KB System
route to recovery.
Hugo.
http://www.cgsecurity.org/wiki/TestDisk
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--- I get nervous when I see words like 'mayhaps' in a novel
not settled down into its final form quite yet. Note that
RAID-5 over two devices won't give you any space benefits over RAID-1
over two devices. (Or any reliability benefits either).
Hugo.
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in the kernel that detects when
it's being told about a duplicate image (rather than an additional
device in the same FS). Neither of these has been written yet, I'm
afraid.
I've deleted quite a bunch of files on my production system because of this...
Oops. I'm sorry to hear that. :(
Hugo
On Thu, Jun 20, 2013 at 10:22:07AM +, Gabriel de Perthuis wrote:
On Thu, 20 Jun 2013 10:16:22 +0100, Hugo Mills wrote:
On Thu, Jun 20, 2013 at 10:47:53AM +0200, Clemens Eisserer wrote:
Hi,
I've observed a rather strange behaviour while trying to mount two
identical copies
deal with the problem at the
earliest point of confusion.
Hugo.
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--- I know of three kinds: hot
too bad. Good luck and thank you.
If you want to make fast atomic incremental copies of btrfs to a
remote system, then btrfs send/receive may be what you're looking for.
Hugo.
Sent from my iPhone
On Jun 20, 2013, at 5:56 AM, Hugo Mills h...@carfax.org.uk wrote:
On Thu, Jun 20, 2013
...
Hugo.
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.
Not that I've done anything other than a cursory check but it looks
like the read only data is fine.
Might be a good idea to use that to refresh your backups, just in
case my prediction about the fixability is correct.
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk
On Tue, Jul 02, 2013 at 06:36:48PM +0100, Peter Chant wrote:
On 07/02/2013 08:29 AM, Hugo Mills wrote:
This is usually an indication that you have bad hardware -- I'd
suggest testing RAM, PSU, CPU in that order. I'm not sure what, if
anything, can be done to fix the error on the disk right now
insert an i in the middle of
each element of size_strs should deal with the problem.
Hugo.
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--- Charting the inexorable advance of Western
mount options. With grub,
this should be possible to do manually at boot time. That should get
yout the ability to mount the FS with just a single mirror. If that
works, you can then use btrfs dev add to add the new device to the
filesystem, and then a full balance to recreate the mirror.
Hugo
(probably in the fairly distant future),
but hasn't arrived yet.
Hugo.
(It has been asked already on the Net
(http://unix.stackexchange.com/questions/82869/can-btrfs-handle-different-raid-levels-for-different-subvolumes)
but the question didn't get the answer. I guess answering it should
Is this expected? Benign?
Yes, I believe it's harmless and will go away after the first
mount.
Hugo.
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--- I gave up smoking, drinking and sex
.
Hugo.
System, RAID1: total=8.00MB, used=132.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=2.00GB, used=1.13GB
Metadata: total=8.00MB, used=0.00
On Thu, Jul 18, 2013 at 10:19 AM, Sandy McArthur sandy...@gmail.com wrote:
I was able to recover the filesystem using the btrfsck
file if you do). As the file size goes up, the odds of it
being damaged increase.
Hugo.
I briefly looked for an rsync option to keep going on source i/o errors
but didn't find one.
Roger
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faster than the mSATA.
This one I don't have an answer for, sorry.
Hugo.
Anyway, thanks for the fantastic filesystem. Sorry for the long email,
but these questions have been in the back of my mind for some time now.
For the first question(s) at least I have not been able to find anything
it doesn't work.
Hugo.
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, it can't be used by RAID-0.
If you want to use the full space available, you should rebalance
to single usage, which stops the RAID-0 striping, and allocates
linearly:
# btrfs balance start -dconvert=single,soft /samples
Hugo.
$ df -h
Filesystem Size Used Avail Use% Mounted
. I've done pretty much the same thing
as this myself, and a scrub, though scary in the amount of noise it
made, fixed everything satisfactorily.
Hugo.
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On Fri, Jul 26, 2013 at 04:35:59PM +0200, Axelle wrote:
Hi Hugo,
Thanks for your answer, but I'm afraid I still don't get it.
RAID-0 requires at least two devices.
Well, I have three devices, so that's more than enough isn't it?
Or do you mean I should be adding two devices at a time
change.
This is why we don't recommend using device= mount flags.
Is this possible? What is the syntax?
I don't believe it is possible. Finding filesystems by UUID is (I
think) a userspace-based thing, so you'd have to have an initrd
anyway.
Hugo.
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=== Hugo Mills: hugo
be
extended backwards, if you see what I mean?
No, using gparted to move it backwards into the free space is your
best option here.
Hugo.
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branch to work
in, based on the btrfs-next branch, then merge in the other branch (or
vice-versa).
Note that btrfs-next is usually based on the latest released kernel
anyway, so that's likely to be largely superfluous.
Hugo.
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built. Suggestions?
$ make btrfs-corrupt-block
Some of the more outré commands aren't built by default and have to
be built individually.
Hugo.
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on disk, i.e. one has been
created by cp --reflink of the other?
You can't, using simple userspace tools. I think the only way would
be to use the tree search ioctl to inspect the extents for each file,
and see whether any of them overlap. Why do you need to know this?
Hugo.
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=== Hugo Mills
, but it gives the same result.
Any hints how to recover from that?
I have backups, but it would be nice if the filesystem just mounted.
Try mounting with both -orecovery and -oro,recovery.
Hugo.
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PGP key
the superblock with one that works. If that's not going to
be useful, fall back to btrfsck --repair.
Finally, btrfsck --repair --init-extent-tree may be necessary if
there's a damaged extent tree. Finally, if you've got corruption in
the checksums, there's --init-csum-tree.
Hugo.
--
=== Hugo
information to make a sensible decision.
Hugo.
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--- emacs: Eighty Megabytes And Constantly Swapping. ---
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On Thu, Aug 29, 2013 at 01:44:54PM -0600, Chris Murphy wrote:
On Aug 29, 2013, at 1:40 PM, Hugo Mills h...@carfax.org.uk wrote:
On Thu, Aug 29, 2013 at 01:37:51PM -0600, Chris Murphy wrote:
Proceeding will roll back the file system to a previous state, and may
cause the loss
On Fri, Aug 30, 2013 at 09:44:28AM -0500, Eric Sandeen wrote:
On 8/29/13 3:19 PM, Chris Murphy wrote:
On Aug 29, 2013, at 1:53 PM, Hugo Mills h...@carfax.org.uk wrote:
On Thu, Aug 29, 2013 at 01:44:54PM -0600, Chris Murphy wrote:
Certainly, if known for sure it won't be more than 30
in a later version), or
should I open a bug report about it?
Try 3.10 or 3.11 before filing a bug on it.
If you want a debian-packaged kernel, they're available from the
experimental distribution.
Hugo.
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this, and you've
got bad RAM or PSU something...
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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--- What are we going to do tonight? The same thing we do ---
every night
.
If I would like to show the subvolume, i get
gspe@jura:/mnt$ sudo btrfs subvolume list /
gspe@jura:/mnt$
nothing is shown!!!
Try using the -a option. It got added a while ago, and has been a
complete pain in the neck ever since...
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk
On Thu, Sep 05, 2013 at 09:06:19PM +0600, Roman Mamedov wrote:
On Thu, 5 Sep 2013 15:54:07 +0100
Hugo Mills h...@carfax.org.uk wrote:
On Thu, Sep 05, 2013 at 05:43:27PM +0300, Тимофей Титовец wrote:
Hello guys, i try to convert ext4 volume, but btrfs-convert show me error:
No valid
-convert can look at it as a block device rather
than as a file:
# losetup -f --show file
/dev/loop0
# btrfs-convert /dev/loop0
Hugo.
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to include out-of-band and in-band.
Hugo.
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--- Once is happenstance; twice is coincidence; three times ---
is enemy
ago to change the names to something more
logical and expressive, but it didn't get merged.
Hugo.
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--- Stick them
). So, no.
-- Can raid1 ensure that data are always duplicated on different devices AND
take advantage of all available space?
Depends on the relative sizes of the devices. If your largest
device is bigger than the rest put together, then you'll lose some
space.
Hugo.
Regards,
Sam
On Thu, Sep 26, 2013 at 02:55:38PM +, miaou sami wrote:
OK, that's clear.
Nice space simulator btw :-) you should add a link somewhere in btrfs wiki...
There is one, linked from the first line of the relevant section in
the FAQ.
Hugo.
Thanks
on IRC about this very
point right now. :)
Hugo.
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--- A clear conscience. Where did you get this taste
? (Looks like there's a
v6.01 available). I can't see a list of the limitations and
capabilities of syslinux and btrfs on the syslinux website.
Hugo.
--
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On Fri, Sep 27, 2013 at 02:12:36PM -0600, Chris Murphy wrote:
On Sep 27, 2013, at 1:36 PM, Hugo Mills h...@carfax.org.uk wrote:
When I boot the machine from its disks, I'm being told that
extlinux only supports single-disk btrfs. Is this still the case?
I'm pretty sure the answer
On Fri, Sep 27, 2013 at 03:04:22PM -0600, Chris Murphy wrote:
On Sep 27, 2013, at 2:44 PM, Hugo Mills h...@carfax.org.uk wrote:
On Fri, Sep 27, 2013 at 02:12:36PM -0600, Chris Murphy wrote:
On Sep 27, 2013, at 1:36 PM, Hugo Mills h...@carfax.org.uk wrote:
When I boot the machine
...)
Hugo.
Thanks
On 29 September 2013 01:35, Aastha Mehta aasth...@gmail.com wrote:
Hi,
I have few questions regarding logging triggered by calling fsync in BTRFS:
1. If I understand correctly, fsync will call to log entire inode in
the log tree. Does this mean that the data extents
experimental design, and (b)
publish the results. :)
Hugo.
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--- I always felt that as a C programmer, I
could have done. It would probably be slower
than normal to access the files while the balance is happening,
because the balance is using up I/O bandwidth, but other than that
there should be no impact.
Hugo.
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696.00KiB 696.00KiB ---
Note that the SI mandate a space between the value and the unit.
Note also, for future reference, that SI use k for 10^3, whereas IEEE
use Ki for 2^10.
Hugo.
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On Tue, Oct 08, 2013 at 06:01:57PM +0100, Hugo Mills wrote:
On Wed, Oct 09, 2013 at 12:54:03AM +0800, Shilong Wang wrote:
Hi David,
2013/10/8 David Sterba dste...@suse.cz:
On Mon, Oct 07, 2013 at 03:21:46PM +0800, Wang Shilong wrote:
You can use it like:
btrfs qgroup show
the former.
Hugo.
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--- You got very nice eyes, Deedee. Never noticed them ---
before. They real
with it for now, or if it's something unusual
that needs investigating. On the chance that it's the latter, I'm
reporting it here.
Hugo.
Feb 23 21:45:42 vlad kernel: [ cut here ]
Feb 23 21:45:42 vlad kernel: WARNING: at fs/btrfs/disk-io.c:815
clean_tree_block+0x9d/0xbb
trigger hundreds (literally) of these backtraces with a
single touch /media/vlad/video/video/foo. If I encode a video to the
FS, the backtraces come in bursts at intervals of, say, 20 seconds
(it's not perfectly regular).
Hugo.
On Wed, Feb 25, 2009 at 08:03:01AM -0600, Mitch Harder (aka
expecting it to
become anywhere near full. The only thing that writes to the
filesystem is deliberately coded to leave several gigabytes of space
free.
Hugo.
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On Wed, Mar 04, 2009 at 01:50:53PM -0500, Josef Bacik wrote:
On Wed, Mar 04, 2009 at 06:06:19PM +, Hugo Mills wrote:
Last night, this event jammed up a good chunk of my server:
Mar 4 01:51:36 vlad kernel: btrfs searching for 1716224 bytes, num_bytes
1716224, loop 2
yet.
Hugo.
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--- Klytus! Are your men on the right pills? Maybe you should ---
execute their trainer
the filesystem online to 70G because I knew I would
run out within the next few hours. Despite the expansion, it still ran
out at (just short of) 50G.
Unless you've resized your filesystem online, I think we're seeing
different problems.
Hugo.
--
=== Hugo Mills: h...@... carfax.org.uk
On Mon, Mar 09, 2009 at 10:31:41AM +, Hugo Mills wrote:
After an online resize, the filesystem reports its new size, but
still runs out of space at the old size:
[...]
Unmounting and remounting the filesystem seems to make the new
space available for use again
and unmounted (as above).
Hugo.
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--- Happiness is mandatory. Are you happy? ---
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On Sun, Oct 04, 2009 at 08:06:30AM -0400, Chris Mason wrote:
On Sat, Oct 03, 2009 at 05:55:32PM -0400, Josef Bacik wrote:
On Sat, Oct 03, 2009 at 01:21:09PM +0100, Hugo Mills wrote:
I've just had the following on my home server. I believe that it's
btrfs that's responsible
On Tue, Oct 13, 2009 at 10:58:12PM +0800, Yan, Zheng wrote:
On Tue, Oct 13, 2009 at 10:50 PM, Hugo Mills hugo-l...@carfax.org.uk wrote:
On Tue, Oct 13, 2009 at 06:31:45AM -0400, Chris Mason wrote:
On Mon, Oct 12, 2009 at 03:09:35PM +0100, Hugo Mills wrote:
On Sun, Oct 04, 2009 at 08:06
*) can move around, the more so USB flash
gadgets and loop devices.
This looks like it might be related to [1]? (I suspect it slipped
Chris's mind back in April, and nobody's really noticed it since).
Hugo.
[1] http://article.gmane.org/gmane.comp.file-systems.btrfs/2817
--
=== Hugo Mills: h
-- and you can get
the disk start position and length of the extent from the data stored
under the key.
Hugo.
[1] https://btrfs.wiki.kernel.org/index.php/Btree_Items
[2] https://btrfs.wiki.kernel.org/index.php/Data_Structures
--
=== Hugo Mills: h...@... carfax.org.uk | darksatanic.net
to fix it?
The forthcoming[1] btrfsck tool should handle that particular
error, I believe.
To prevent it from happening again, ensure that you have working
barriers on your disks, or that you turn off write caching on the
drives at every boot.
Hugo.
[1] out real soon now
--
=== Hugo
On Sun, Jan 09, 2011 at 08:57:12PM +, Alan Chandler wrote:
On 09/01/11 18:30, Hugo Mills wrote:
No, subvolumes are a part of the whole filesystem. In btrfs, there
is only one filesystem. There are 6 main B-trees that store metadata
in btrfs (plus a couple of others). One of those
balance-progress
patches, but those shouldn't affect this).
Hugo.
PS. I haven't tried with RAID-10 yet, but I suspect that it'll be much
the same.
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-compatibility (or at least, proper error reporting of
unsupported features).
Questions for the panel:
* Is the ioctl API reasonably sane, extensible, future-proof?
* What other block group filters could be useful for this API?
Hugo.
There are situations, such as restarting an interrupted
of my
previous balance progress/cancel patches.
Hugo.
It is useful to be able to balance a subset of the full filesystem.
This patch implements the infrastructure for filtering block groups on
different criteria when balancing the filesystem.
Signed-off-by: Hugo Mills h...@carfax.org.uk
again with 2.6.37. If you can't build it
yourself, there's a PPA at
https://launchpad.net/~kernel-ppa/+archive/ppa with recent kernels in
it.
Hugo.
Computer screen froze and after I rebooted I got the following error
message: no init found. try passing init= bootarg
I booted from Ubuntu CD
On Thu, Jan 20, 2011 at 03:53:41PM +0100, Andreas Philipp wrote:
On 20.01.2011 14:39, Hugo Mills wrote:
On Thu, Jan 20, 2011 at 02:07:23PM +0100, Andreas Philipp wrote:
Hi,
Maybe it is a very stupid question but I want to ask it anyway. In
general, 'btrfs filesystem balance' takes very
got those in the kernel, but all
the key management and block chaining and probably a bunch of things I
don't know about because I'm not a cryptographer -- all of which makes
a big difference to the security of the final system).
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk
that isn't zeroed out.
One solution I've used before is to write a single very large file
full of zeroes, filling the filesystem, then delete it.
$ dd if=/dev/zero of=/mountpoint/foo.dat rm /mountpoint/foo.dat
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk
On Fri, Jan 21, 2011 at 11:28:19AM -0800, Freddie Cash wrote:
On Sun, Jan 9, 2011 at 10:30 AM, Hugo Mills hugo-l...@carfax.org.uk wrote:
On Sun, Jan 09, 2011 at 09:59:46AM -0800, Freddie Cash wrote:
Let see if I can match up the terminology and layers a bit:
LVM Physical Volume == Btrfs
and not err is 1.
Yes, it probably should, but there's not a great deal of point in
fixing this particular issue, because Chris is working on the all-new
(offline) repairing fsck, which should replace the current
checking-only fsck very soon now.
Hugo.
--
=== Hugo Mills: hugo
at.
Hugo.
diff --git a/mkfs.c b/mkfs.c
index 2e99b95..51a5096 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -422,6 +422,7 @@ int main(int ac, char **av)
printf(WARNING! - see http://btrfs.wiki.kernel.org before using\n\n);
file = av[optind++];
+ printf(Checking whether %s is part
.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Dullest spy film ever: The Eastbourne Ultimatum ---
signature.asc
Description: Digital signature
On Sun, Jan 23, 2011 at 11:02:16PM +0100, Goffredo Baroncelli wrote:
On 01/23/2011 07:18 PM, Hugo Mills wrote:
Hi, Felix,
On Sat, Jan 22, 2011 at 04:56:12PM +0100, Felix Blanke wrote:
It was a simple:
mkfs.btrfs -L backup -d single /dev/loop2
But it also happens without
On Mon, Jan 24, 2011 at 02:29:36PM +, Hugo Mills wrote:
If, instead, the initial losetup call tracked the symlinks back to
the original device node (i.e. something like /dev/sdb3, or
/dev/mapper/ruthven-btest in my example), then the name that's
stored in the kernel would be shorter
pinned 0 reserved
[104178.827634] block group has cluster?: no
And so on.
Does this indicate an error of any sort, or is this expected behaviour?
As far as I know, it means that you've run out of space, and not
every block group has been rewritten by the balance process.
Hugo
10 21:58:08 linux-wuce kernel: [ 369.474197]
SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a425
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Someone's been throwing dead sheep down my Fun
with them over there and see if it's the
same bug.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- I must be musical: I've got *loads* of CDs ---
signature.asc
to change mount options in a subvolume? Suppose I would
like to use nodatasum except for /home, will the following work?
mount -o nodatasum /dev/x /
btrfs subvolume create /home
mount -o datasum,subvol=home /dev/x
I'd expect that to work, although I haven't tried it myself.
Hugo
On Sun, Feb 13, 2011 at 06:49:58PM +0100, Yuri D'Elia wrote:
On Sun, 13 Feb 2011 17:30:59 +, Hugo Mills wrote:
First: In the / filesystem I create a subvolume named /home. As soon as
the subvolume is created, I can already see the entry point in /home
without having to mount
Los
Angeles~2010-05-11~720.mov
-- (end)
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Attempted murder, now honestly, what is that? Do they give
?
If I create one RAID 10 with all 8 drives I would only be able to
use 8 times 250GB /2 = 1TB, right?
No, just add the new drives to the existing btrfs pool, and run a
balance, and you should get a btrfs filesystem with 1.5TB of
mirrored/striped storage.
Hugo.
--
=== Hugo Mills: hugo
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