On Thu, Apr 02, 2015 at 09:58:39AM +, Andy Smith wrote:
Hi Hugo,
Thanks for your help.
Makes a change from you answering my questions. :)
On Wed, Apr 01, 2015 at 03:42:02PM +, Hugo Mills wrote:
On Wed, Apr 01, 2015 at 03:11:14PM +, Andy Smith wrote:
Should I run a scrub
+0x1c0/0x1c0
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a file and
a loopback device may be more useful.
Hugo.
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far will be just the pieces that the
FS has tried to read, and where, as a result, it's been able to detect
the out-of-date data. A scrub will check and fix everything.
Hugo.
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PGP
not been fixed yet, unfortunately. The only known solution to
date is, as you've found, remaking the FS from scratch and restoring
from backups.
Sorry to be the bearer of bad news.
Hugo.
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hugo@... carfax.org.uk | Circus sideshow performer specialising
is reported as working.
Is there (or will there be,) a bad penalty of fragmentation?
With duperemove, it operates on an extent scale, not at the level
of blocks, so the fragmentation isn't so bad.
Hugo.
--
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hugo@... carfax.org.uk |
http
repo. If you're not using parity RAID, then the
last few kernels have been OK, but keeping up with the latest version
is still a reasonably good idea.
Hugo.
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hugo@... carfax.org.uk | people.
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it few hours ago, but I would like to hear any feedback, whether
there would be any use for such a tool, feature requests etc :)
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of some pieces of the
filesystem.
Hugo.
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subvolume management operations
(and nothing else) through the top-level mount at /media/btrfs.
Hugo.
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/Btrfs_source_repositories#Dependencies
[2]
https://btrfs.wiki.kernel.org/index.php/Getting_started#Compiling_the_userspace_utilities
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http://carfax.org.uk
with future expansion of the array?
With raid1 mode btrfrs is reasonably smart about mixed disk sizes, and
you usually end up with half of the total space available.
http://carfax.org.uk/btrfs-usage/ may be useful here.
Hugo.
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On Wed, Jan 28, 2015 at 09:15:42AM +0800, Qu Wenruo wrote:
Original Message
Subject: [PATCH 1/2] btrfs-progs: Make option parsing more robust to
code modifications
From: Hugo Mills h...@carfax.org.uk
To: linux-btrfs@vger.kernel.org, dste...@suse.cz
Date: 2015年01月27日 23:05
-by: Hugo Mills h...@carfax.org.uk
---
cmds-check.c | 14 +-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/cmds-check.c b/cmds-check.c
index a1226c6..d4d2e73 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -8403,11 +8403,13 @@ out:
return bad_roots;
}
-enum
which
cannot be a char (and hence a short option), and simply switch on those
within the case statement.
Signed-off-by: Hugo Mills h...@carfax.org.uk
---
cmds-check.c | 49 +++--
1 file changed, 27 insertions(+), 22 deletions(-)
diff --git a/cmds
/dev/sdb3 /dev/sdd3 /mountpoint
btrfs fi resize 4:max /mountpoint
The 3 and 4 in the resize commands should be the devid of the
newly-added device.
Hugo.
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hugo@... carfax.org.uk | I'm only a _poor_ corrupt
and snapshots. You
can then use -r to select the tree to restore.
Can send / receive do this perhaps ?
Yes, but only if you can mount the FS.
Hugo.
--
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- ultimately the write doesn't get committed
the FS gets forced readonly.
Thanks in advance !
--
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:-(, all of
the snapshot were deleted because of a regex problem in a script I
ran.
--
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hugo@... carfax.org.uk | hammer: it feels so good when you find the bug, and
http://carfax.org.uk/ | you're allowed to stop debugging
I've just added a new disk to my main storage filesystem. Running
the obligatory balance to spread the data out, it's managed about 14%
of the job, and then has gone into some kind of tight loop. No chunks
have been found or balanced in the last 2 hours, and one kworker
thread is pegged at
On Mon, Jan 12, 2015 at 11:21:58AM +, Hugo Mills wrote:
I've just added a new disk to my main storage filesystem. Running
the obligatory balance to spread the data out, it's managed about 14%
of the job, and then has gone into some kind of tight loop. No chunks
have been found
On Mon, Jan 12, 2015 at 01:36:27PM +, Holger Hoffstätte wrote:
On Mon, 12 Jan 2015 12:27:12 +, Hugo Mills wrote:
On Mon, Jan 12, 2015 at 11:21:58AM +, Hugo Mills wrote:
I've just added a new disk to my main storage filesystem. Running
the obligatory balance to spread
(such as it is) to
implement this, as it's a (moderately rare) repeat request.
Hugo.
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On Mon, Jan 05, 2015 at 08:11:56PM +0100, Lennart Poettering wrote:
On Mon, 05.01.15 18:22, Hugo Mills (h...@carfax.org.uk) wrote:
On Mon, Jan 05, 2015 at 06:15:12PM +0100, Lennart Poettering wrote:
Heya,
I recently added some btrfs magic to systemd's machinectl/nspawn
tool. More
extents
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to keep my
data eggs from all being in the same filesystem basket.
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Unallocated: 2.38TiB
/dev/sdb4, ID: 2
Device size: 2.63TiB
Data,RAID1:252.00GiB
Metadata,RAID1: 3.00GiB
System,RAID1:8.00MiB
Unallocated: 2.38TiB
--
Hugo Mills | The trouble with you, Ibid, is you
losing two devices, though, even if the remaining
data is actually enough to reconstruct the FS.
Hugo.
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of the
failure modes beyond the guarantee.
Hugo.
On Mon, Dec 29, 2014 at 1:04 PM, Hugo Mills h...@carfax.org.uk wrote:
On Mon, Dec 29, 2014 at 01:00:05PM -0600, sys.syphus wrote:
oh, and sorry to bump myself. but is raid10 *ever* more redundant in
btrfs-speak than raid1? I currently use raid1
output here, or post to bugzilla.kernel.org
That's probably going to give enough information to the developers
to work out where the lockup is happening, and is clearly the way
forward here.
Hugo.
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hugo@... carfax.org.uk
or something equally dumb.
Userspace doesn't as far as I know, get to make that decision. I've
just read the fallocate(2) man page, and it says nothing at all about
the contiguity of the extent(s) storage allocated by the call.
Hugo.
[snip]
--
Hugo Mills | O tempura! O moresushi
On Sat, Dec 27, 2014 at 01:28:46PM -0500, Zygo Blaxell wrote:
On Sat, Dec 27, 2014 at 09:30:43AM +, Hugo Mills wrote:
On Sat, Dec 27, 2014 at 10:01:17AM +0100, Martin Steigerwald wrote:
Am Freitag, 26. Dezember 2014, 14:48:38 schrieb Robert White:
On 12/26/2014 05:37 AM, Martin
drawbacks?
No drawbacks. I've used this method for testing purposes.
Obviously, you'll have to set up the loop devices to mount the FS, but
mkfs shouldn't have any problems.
Hugo.
--
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hugo@... carfax.org.uk |
http
, and checking your logs for SATA errors and similar
problems.
Hugo.
[snip]
--
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On Wed, Dec 17, 2014 at 09:44:43PM -0800, Robert White wrote:
On 12/16/2014 01:05 AM, Hugo Mills wrote:
On Mon, Dec 15, 2014 at 07:47:06PM -0800, Robert White wrote:
I prefer slice, not that I am totally happy with that word either.
But by the time you get through loopback devices, memory map
Label: none uuid: 752ed11b-defc-4717-b4c9-a9e08ad64ba6
Total devices 1 FS bytes used 404.74GB
devid1 size 410.50GB used 410.50GB path /dev/md3
Regards,
Daniele
--
Hugo Mills | Python is executable pseudocode; perl is executable
hugo@... carfax.org.uk | line
the latter carries almost as much problematic baggage
as the former.
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.)
The parity computation on a single value is just nutty waste of time
though. Backing it out when the array is degraded is double-nuts.
Maybe everybody just decided it was too crazy to consider for the
CPU time penalty...?
So yea, semantics... apparently...
--
Hugo Mills | There's
Data, RAID1: total=314.00GiB, used=313.55GiB
System, RAID1: total=32.00MiB, used=64.00KiB
Metadata, RAID1: total=1.00GiB, used=422.45MiB
unknown, single: total=144.00MiB, used=0.00
--
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hugo@... carfax.org.uk | southerly, I
device, and so on.
The minimum stripe width (e.g. number of devices) is 2 for RAID-0,
4 for RAID-10, 2 for RAID-5 and 3 for RAID-6.
Hugo.
--
Hugo Mills | I get nervous when I see words like 'mayhaps' in a
hugo@... carfax.org.uk | novel, because I fear that just round
On Fri, Dec 12, 2014 at 03:25:19PM -0800, Robert White wrote:
On 12/12/2014 02:59 PM, Hugo Mills wrote:
On Fri, Dec 12, 2014 at 02:54:24PM -0800, Robert White wrote:
I've seen it mentioned here that generally data extents are 1G and
metadata extents are 256M.
Is that per-drive or per-stripe
to be inaccurate, and whatever way
round we show it, someone will complain.
Hugo.
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, and it should have been untouched, because it was marked as
dirty in the fs_info-pinned_extents tree, and therefore used by the
trees that the last committed superblock points to.
Wow. Nice one, Filipe.
Hugo.
--
Hugo Mills | Startle, startle, little twink. How I
On Wed, Dec 03, 2014 at 08:02:31AM +0530, Shriramana Sharma wrote:
On Tue, Dec 2, 2014 at 2:04 PM, Hugo Mills h...@carfax.org.uk wrote:
Is that correct: what btr sub list shows as top level is indeed the
parent subvolume?
No, it's the top-level subvolume. (See my earlier mail about
that nesting subvolumes is generally more awkward to manage, and
that putting files in the top-level subvol can't do what most people
want to do with it. Hence the recommended subvol management layout at
[1].
Hugo.
[1] https://btrfs.wiki.kernel.org/index.php/SysadminGuide#Subvolumes
--
Hugo
to break scripts?
Any script which relies on being able to delete subvolumes in
unattended operation will now require modification to use -f.
Hugo.
--
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the
default subvol, you still can't delete it.
Hugo.
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On Sun, Nov 30, 2014 at 07:08:51PM +0530, Shriramana Sharma wrote:
On Sun, Nov 30, 2014 at 5:29 PM, Hugo Mills h...@carfax.org.uk wrote:
In the data structures on disk, it's 5. The kernel aliases 0 to
mean subvolid 5.
So why 5 and not just 0 which seems a logical choice? On top
set to a
single value by default (e.g. through a shall alias).
Hugo.
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could see this possibly being useful for having fewer false
positives when using the inbuilt checksums for purposes of dedup.
Hugo.
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, for example :) ). For userspace, probably the latest -rc
tag from kdave's repo.
See https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories
Hugo.
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under some circumstances.
Hugo.
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--- And what rough beast, its hour come round at last / slouches ---
towards Bethlehem
/biggie/BACKUP/, is there a different way I should go about
sending an entire disk?
Thanks!
-Ken
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--- ©1973 Unclear Research Ltd
the
partition, and then resizing the FS back up to fit the partition
exactly (with btrfs fi resize n:max).
Hugo.
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--- Stick them
On Fri, Nov 14, 2014 at 05:00:26PM -0500, Josef Bacik wrote:
On 11/14/2014 04:51 PM, Hugo Mills wrote:
Chris, Josef, anyone else who's interested,
On IRC, I've been seeing reports of two persistent unsolved
problems. Neither is showing up very often, but both have turned up
often
On Mon, Nov 17, 2014 at 11:59:48AM +0100, Konstantin wrote:
Josef Bacik wrote on 14.11.2014 at 23:00:
On 11/14/2014 04:51 PM, Hugo Mills wrote:
[snip]
Problem 2: Unexplained zeroes
Failure to mount. Transid failure, expected xyz, have 0. Chris
looked at an early one of these (for Ke
.
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--- Great films about cricket: Forrest Stump ---
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not
support newer kernel features -- but that will simply mean you can't
access the feature, not that anything will be broken.
If you're doing recovery work (btrfs check and friends) then using
the latest released version of the tools is strongly recommended.
Hugo.
--
=== Hugo Mills: hugo
bring the system
down if you access the broken data. But you're safe with 3.17.2, so
it's a moot point for you right now.
Hugo.
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1.62GiB
devid1 size 6.52GiB used 2.24GiB path /dev/sda3
Btrfs v3.12
# btrfs fi df /
Data, single: total=1.98GiB, used=1.58GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=264.00MiB, used=36.03MiB
--
=== Hugo Mills: hugo@... carfax.org.uk
used 1.62GiB
devid1 size 6.52GiB used 2.24GiB path /dev/sda3
Btrfs v3.12
# btrfs fi df /
Data, single: total=1.98GiB, used=1.58GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=264.00MiB, used=36.03MiB
--
=== Hugo Mills: hugo@... carfax.org.uk
, but will still help to keep the number of
extents down. That will reduce the metadata overhead.
That's about all there is for btrfs-specific options, I think.
Hugo.
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, I haven't experienced any.
If you make read-only snapshots, there's a good chance of metadata
corruption. It's fixed in 3.17.2.
Hugo.
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somewhere.
I wouldn't put it in those words, but yes, a single CoW operation
occurs on writes to data with nodatacow set.
Hugo.
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--- There's
at all,
so you can't get a list of blocks on an underlying device because
there isn't one. Indirecting the accesses through the filesystem,
however, allows us to side-step btrfs's problems with part (b) above,
and in theory gives us swapfile capability.
Hugo.
--
=== Hugo Mills: hugo
On Wed, Oct 22, 2014 at 01:39:58PM -0700, Robert White wrote:
On 10/22/2014 01:25 PM, Hugo Mills wrote:
The new code is the swap-on-NFS infrastructure, which indirects
swapfile accesses through the filesystem code. The reason you have to
do that with NFS is because NFS doesn't expose
the file will only read one of the
copies of any given block (so if that's good and the other copy is
bad, it won't fix anything).
Hugo.
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-it fixes yet, but
if so, that's the first /I/ remember reading of it.
Other than that detail, what you posted matches my knowledge and
experience, such as it may be as a non-dev list regular, as well.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key
testing to
see how 'read-only' mounting a btrfs filesystem really is.
If the FS is RO, then yes, it won't fix things.
Hugo.
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--- Great
, but I've just checked, and it doesn't seem to have the
subvol in it on my server (3.16.2).
Hugo.
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--- Unix: For controlling fungal diseases
Is there anyway to delete this partial subvol?
Thanks,
Justin
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--- All hope abandon, Ye who press Enter here. ---
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.
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--- ... one ping(1) to rule them all, and in the ---
darkness bind(2) them
in participating, or even
just using it, please let me know.
Thanks to everyone who has worked on BTRFS so far ;-)
James
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--- How do you
On Sat, Sep 27, 2014 at 06:33:58PM +0200, James Pharaoh wrote:
On 27/09/14 18:17, Hugo Mills wrote:
On Sat, Sep 27, 2014 at 05:39:07PM +0200, James Pharaoh wrote:
2. Duplicating NOCOW files
This is obviously possible, since it takes place when you make a snapshot.
So why can't I create
taking action on the basis of information in this e-mail or
any attachments. The DRW Companies make no representations that this e-mail
or any attachments are free of computer viruses or other defects.
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.
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--- I will not be pushed, filed, stamped, indexed, briefed, ---
debriefed or numbered. My life is my own
is KiB (upper case), SI is kB (lower case). Other than that, the UI
looks pretty comfortable to me.
Reviewed-by: Hugo Mills h...@carfax.org.uk
---
I tried to make the command line UI rich enough to address current and future
needs, I'm open to tweaks, rewording etc.
The patch is based
On Sun, Sep 14, 2014 at 05:15:08AM +0200, Piotr Pawłow wrote:
On 12.09.2014 12:47, Hugo Mills wrote:
I've done this before, by accident (pulled the wrong drive, reinserted
it). You can fix it by running a scrub on the device (btrfs scrub
start /dev/ice, I think).
I'd like to remind everyone
in production, is running
btrfs on top of mdraid the way to go at this point?
Using btrfs native RAID means that you get independent checksums on
the two copies, so that where the data differs between the copies, the
correct data can be identified.
Hugo.
--
=== Hugo Mills: hugo
on every disk in the array shouldn't matter.
N-way mirroring is in the queue for after RAID5/6 work; ideally, once it
is ready, mkfs should default to one copy per disk in the filesystem.
Why change the default from 2-copies, which it's been for years?
Hugo.
--
=== Hugo Mills: hugo
On Thu, Sep 11, 2014 at 08:06:21AM -0400, Austin S Hemmelgarn wrote:
On 2014-09-11 07:38, Hugo Mills wrote:
On Thu, Sep 11, 2014 at 07:19:00AM -0400, Austin S Hemmelgarn wrote:
On 2014-09-11 02:40, Russell Coker wrote:
Also it would be nice if there was a N-way mirror option for system data
of them.
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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--- You can get more with a kind word and a two-by-four than you ---
can with just a kind word
above will only touch chunks with 5% actual
data or less). This is in the FAQ.
Hugo.
Metadata: total=8.00MB, used=0.00
: total=200.00MB, used=0.00
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http
On Wed, Sep 03, 2014 at 04:53:39AM +, Duncan wrote:
Hugo Mills posted on Tue, 02 Sep 2014 13:13:49 +0100 as excerpted:
On Tue, Sep 02, 2014 at 12:05:33PM +, Holger Hoffstätte wrote:
So where does the confusing initial display come from? [I] don't
remember ever seeing
about that.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Normaliser unix c'est comme pasteuriser le Camembert ---
signature.asc
Description: Digital signature
to calculate the used vs free values for df.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Great films about cricket: Umpire of the Rising Sun ---
signature.asc
Description
##_to_cpu(*__tmp); \
+ *v = get_unaligned_le##bits(__tmp); \
} while (0)
#define TLV_GET_U8(s, attr, v) TLV_GET_INT(s, attr, 8, v)
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http
the user to perform that matching correctly.
Signed-off-by: Hugo Mills h...@carfax.org.uk
---
v1 - v2: Update man page as well.
Documentation/btrfs-subvolume.txt | 2 ++
btrfs-list.c | 32 +++-
btrfs-list.h | 2 ++
cmds
the user to perform that matching correctly.
Signed-off-by: Hugo Mills h...@carfax.org.uk
---
btrfs-list.c | 32 +++-
btrfs-list.h | 2 ++
cmds-subvolume.c | 6 +-
3 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/btrfs-list.c b/btrfs-list.c
below, not bellow
Signed-off-by: Hugo Mills h...@carfax.org.uk
---
cmds-subvolume.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 5216e53..349d0db 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -390,7 +390,7 @@ static const
the machine? Yes.
* How can I resume or cancel the scrub?
It's probably simply not running -- see above.
* Is it more risky to leave the above errors uncorrected, or to run
btrfsck with --repair?
I would, I think, leave them.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk
is to
balance the data usage evenly across multiple devices. (Actually, to
balance the available space evenly).
Also note that the data part isn't tree-structured, so referring to
balancing the trees with a -d flag is doubly misleading. :)
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- UNIX: Italian pen maker
.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- You stay in the theatre because you're afraid of having no ---
money? There's irony
On Mon, Aug 04, 2014 at 11:31:57AM +0100, Peter Waller wrote:
Thanks Hugo, this is the most informative e-mail yet! (more inline)
On 4 August 2014 11:22, Hugo Mills h...@carfax.org.uk wrote:
* btrfs fi show
- look at the total and used values. If used total, you're OK
.
One thing I didn't find any information about is the overhead
introduced by mixied-mode.
It would be great if you could explain it in a few sentences.
I don't know, I'm afraid. I don't think we've got any benchmarks on
the scale of the slowdown.
Hugo.
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=== Hugo Mills: hugo
5, 10, 20, 50, 80.
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net
actually doing what the original author intended? If
so, what was that intent?
Hugo.
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=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Summoning his Cosmic Powers, and glowing slightly
On Thu, Jul 31, 2014 at 09:53:15PM -0400, Nick Krause wrote:
On Thu, Jul 31, 2014 at 3:09 PM, Hugo Mills h...@carfax.org.uk wrote:
On Thu, Jul 31, 2014 at 01:53:33PM -0400, Nicholas Krause wrote:
This adds checks for the stated modes as if they are crap we will return
error
not supported
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