On Wed, Sep 23, 2015 at 03:12:26PM +0200, David Sterba wrote:
> On Tue, Sep 22, 2015 at 02:36:02PM +0000, Hugo Mills wrote:
> > > Yeah, right now there's no persistent default for the allocator. I'm
> > > still hoping that the object properties will magically solve that
On Wed, Sep 23, 2015 at 09:19:38PM +0800, Qu Wenruo wrote:
> 在 2015年09月23日 21:12, David Sterba 写道:
> >On Tue, Sep 22, 2015 at 02:36:02PM +0000, Hugo Mills wrote:
> >>>Yeah, right now there's no persistent default for the allocator. I'm
> >>>still hoping that the
>
> [root@rak ~]# btrfs --version
> btrfs-progs v4.2
>
> [root@rak ~]# btrfs fi show
> Label: 'data' uuid: 754a3186-c0ae-4680-ab28-864c8bdad8b5
> Total devices 1 FS bytes used 1.23TiB
> devid1 size 1.72TiB used 1.24TiB path /dev/sdb2
>
> bt
een the extremes of reckless rsync and overly
> accurate git. It's just a steep learning mountain.
>
>
> *) I used fdupes' output ran through a perl script that calls
> "cp --reflink" for each match. Would "bedup" or "duperemove"
> do a better job? bed
As it stands, we can fake that in mkfs but it'll get stomped
> > by balance nearly immediately.
>
> Please share those casual thoughts with the group. :)
I had some as well last year (see my other mail). I hope they line
up with Jeff's. :)
Hugo.
--
Hug
PeU52cfWHL05axe8l75pU6Ywwrk406QxyrTvx
> 2Rh8tXBJItUeMA/D8mRnwWVZBWFUndl6JlBNSyf51fSP+4lPkChbM5UnSOjDOwvE
> E7XpGy31TQI0bqpy8qoIkI9wkek6iOlMCppZ9U2vICbeP+65WtNZKfQcCO0t6Z1H
> 6IqfHsaDvvaiorxEWWIarsIfHZWnWJeav545t6pd4VU3v52YQN2YIOLY8EhWv4Wt
> 90Xc1izPvPvnyQa3eQPg1ISdqNfJRFlYjSJ75zGvSPurIy77oOyvPa1EfEO7IMys
>
s mounted in two
> different places, and that I have some VMs on it, and am using the
> nocow attribute on the VM files.
>
> Regards,
> Sylvain
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evice after I have unmount it? BTW: Is btrfs-progs needed for mounting?
>
> I should have been more clear and say "run btrfs check", which I originally
> intended to write but then somehow didn't. Sorry. :-)
>
> btrfs-progs is not needed for mounting, only for administrativ
On Tue, Sep 22, 2015 at 04:23:33PM +0200, David Sterba wrote:
> On Tue, Sep 22, 2015 at 01:41:31PM +0000, Hugo Mills wrote:
> > On Tue, Sep 22, 2015 at 03:36:43PM +0200, Holger Hoffstätte wrote:
> > > On 09/22/15 14:59, Jeff Mahoney wrote:
> > > (snip)
> > >
On Tue, Sep 22, 2015 at 10:54:45AM -0400, Austin S Hemmelgarn wrote:
> On 2015-09-22 10:36, Hugo Mills wrote:
> >On Tue, Sep 22, 2015 at 04:23:33PM +0200, David Sterba wrote:
> >>On Tue, Sep 22, 2015 at 01:41:31PM +, Hugo Mills wrote:
> >>>On Tue, Sep 22, 20
nted (and it's definitely a
> bug that it's not doing so today), but is unlikely to be ideal for a
> different filesystem than the one it started out as.
>
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]
No. If you try doing that particular combination of features, you
end up with a filesystem that can be inconsistent: there's a race
condition between updating the data in a file and updating the csum
record for it, and the race can't be fixed.
Hugo.
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Hugo Mills | I spent most of my
oadmap, but the roadmap is notoriously
> short-sighted when it comes to time-frame for completion of
> something. You have to understand also that the focus in BTRFS has
> also been more on data safety than performance, because that's the
> intended niche, and the area most people look to ZF
king
> >about general purpose use or is he talking about general purpose OLTP use?
> >
> My takeaway was that he intended 'general purpose use' to mean
> generic every day usage across a wide variety of systems, he was not
> particularly specific about it however.
- --
Hugo M
63414272(gen: 293905 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 100290560(gen: 293904 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 61906944(gen: 293904 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 99393536(gen: 293903 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 79740928(gen: 293903 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 47403008(gen: 293901 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 42622976(gen: 293899 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 40329216(gen: 293898 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 38137856(gen: 293897 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 36515840(gen: 293896 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> -x--x---x--x--
>
> Thanks in advance
>
>
> mit freundlichen Grüßen
> Jürgen Sauer
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with
zeroes -- which is no worse than the random data you're likely to
encounter from reading the broken data that the FS is (rightly)
protecting you from.
Hugo.
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hugo@... carfax.org.uk | here, di verse it gets
http://
l
support your use of btrfs on a kernel that old). 3.19 is about the
earliest kernel I'd feel happy about using at this point.
Hugo.
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ally going from 5-drive raid6 to 4-drive
> raid6).
>
> Can anyone confirm my assumption? Can I indeed rebalance from
> 5-drive raid6 to 4-drive raid6 if the volume is not too big?
Yes, you can, provided, as you say, the data is small enough to fit
into the reduced filesystem.
Hu
uld be a btrfs dev drop, which is the fail-like
operation: tell the FS that a device is useless, and should be dropped
from the array, so the FS doesn't keep trying to write to it. That's
not implemented yet, though.
Hugo.
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Hugo Mills | Alert status mauve ocelot: Slight chanc
; > make a mess of things...
>
> It is not possible to add a device to an ro filesystem, so effectively
> the fs read-writeability is broken in this case.
I thought this particular issue had already been dealt with in 4.2?
(i.e. you can still mount an FS RW if it's degraded,
On Tue, Sep 08, 2015 at 10:33:54PM +0200, Ian Kumlien wrote:
> On 8 September 2015 at 22:28, Hugo Mills <h...@carfax.org.uk> wrote:
> > On Tue, Sep 08, 2015 at 02:17:55PM -0600, Chris Murphy wrote:
> >> On Tue, Sep 8, 2015 at 2:13 PM, Ian Kumlien <ian.kuml...@gm
On Mon, Sep 07, 2015 at 11:58:45AM -0600, Chris Murphy wrote:
> On Sat, Sep 5, 2015 at 4:42 AM, Hugo Mills <h...@carfax.org.uk> wrote:
> > On Sat, Sep 05, 2015 at 12:13:30PM +0200, Ivan Petrovic wrote:
>
> >> So you're saying that I can't make first and third partition
. There's
probably not enough of it left to make anything coherent.
Hugo.
> Thanks
>
> 2015-09-04 23:17 GMT+02:00 Hugo Mills <h...@carfax.org.uk>:
> > On Fri, Sep 04, 2015 at 09:07:34PM +, Ivan wrote:
> >>
> >> Just to add this:
> >>
> &g
the FS to be
even partly recoverable with a missing device. (Or RAID-10, -5 or -6).
Hugo.
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probably will. These are going to take
a very long time to run (in your case, I'd guess at least a week for
each balance). I would recommend starting the balance in a tmux or
screen session, and also creating a second shell in the same session
to run monitoring processes. I typically use something lik
to help get it
working again.
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doesn't work and eats
your filesystem, sets fire to your sofa and feeds strychnine to your
cat(*). I can't really recommend trying it.
You can change the UUID offline using a recent (4.1 or later)
version of btrfstune.
Hugo.
(*) No sofas were harmed in the writing of this email.
--
Hugo
there's some separate
handling to still keep the fs instances separate, but I don't know how
that works at all or how ext4 and Btrfs differ.
See my other email in this thread. :)
Hugo.
--
Hugo Mills | You know... I'm sure this code would seem a lot
hugo@... carfax.org.uk | better
. ;)
You need one full send to start off the process. After that, you
can use the incremental feature.
On Thu, Aug 27, 2015 at 05:59:47PM +, Hugo Mills wrote:
See my other email in this thread. :)
Didn't get that. Should I?
Yes, you should have got it. You were cc'd. It's the one
- more corrupted.
Smart of the disk, it's not looks, like damaged. (attach)
What i can provide to help fix this issue?
If it's needed, i can recompile kernel with some parameters if it can
help, of course.
--
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hugo@... carfax.org.uk
or
replace them (with different sizes).
Hugo.
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on the problem and should eventually get it right, but
it's just an incredibly difficult issue that has taken multiple tries.
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On Wed, Aug 19, 2015 at 06:10:06PM +0200, Hendrik Friedel wrote:
Hello Hugo,
thanks for your hint.
On 16.08.2015 16:57, Hugo Mills wrote:
Here's your problem -- you've got a RAID 5 filesystem, which has a
minimum allocation of 2 devices, but only one device has free space
-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
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.
Hugo.
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going to be dangerous. The second
may or may not be, depending on how well DRBD copes with direct writes
to its backing store, and how lucky you are about the kernel
identifying the right devices to use for the FS.
Hugo.
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than
having hundreds of half-hourly snapshots a year old to choose from. And
250-ish snapshots per subvolume really does turn out to be VERY
reasonable, provided you're doing reasonable thinning.)
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Hugo Mills | Some days, it's just not worth gnawing through the
hugo
the solution here would be to blacklist the backing store
from btrfs dev scan. I recall that there was such a capability at some
point -- I don't know if it made it into the userspace tools?
Hugo.
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not like my file
system to be the weakest link in the backup chain.
Regards,
Jim
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(gen: 390808 level: 1) seems good, but
generation/level doesn't match, want gen: 390924 level: 1
regards
Martin
1:
https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#parent_transid_verify_failed
--
Hugo Mills | This chap Anon is writing some perfectly lovely
hugo
= selects chunks of that profile. If you wanted to
change the RAID level, you should use convert=.
Hugo.
Greetings,
Hendrik
On 01.08.2015 22:44, Chris Murphy wrote:
On Sat, Aug 1, 2015 at 2:32 PM, Hugo Mills h...@carfax.org.uk wrote:
On Sat, Aug 01, 2015 at 10:09:35PM +0200, Hendrik
. There's nothing at
all here to indicate that you've got a broken log, so dropping it
would be at best pointless. The chunk tree is also most likely
undamaged on both copies.
Hugo.
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Hugo Mills | The early bird gets the worm, but the second mouse
hugo@... carfax.org.uk | gets
empty single chunks left behind by
mkfs are still there. I don't think we have a good solution to this
yet (other than fixing mkfs so it doesn't happen in the first place).
Hugo.
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Hugo Mills | Our so-called leaders speak
hugo@... carfax.org.uk | with words they try to jail ya
http
(which might be empty?).
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Description
?
A scrub is currently running and showed no errors yet.
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. That really ought to be filed as a bug with that distro to
flat out remove 4.1.1 from the repos.
If they picked up 4.1.1 fast enough, they should pick up 4.1.2 just
as quickly...
Hugo.
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Hugo Mills | What are we going to do tonight?
hugo@... carfax.org.uk | The same thing we do
mean a warning like the very first sentence, in bold, that's
already on the wiki page?
https://btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3
Hugo.
--
Hugo Mills | You've read the project plan. Forget that. We're
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YKWpWyKVh7qlENEoqKb4exqr1WGYKU+kBLXRs4wdm3xb66EcWYs0Er1u6v+K1trx
nryFrfUxYtMJsSuR9ZJm88DOsXKAuX1LEdRKVOlq7krsIK8HlTizccMXAl10gKk=
=ndkL
-END PGP SIGNATURE-
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as important (I need to retain fewer of them) is very
useful.
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-physical lookups, and the root tree and log tree
locations make sense.
I don't know whether btrfs-image works any differently from that,
or if so, how it differs.
Hugo.
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http
On Tue, Jul 14, 2015 at 09:09:00PM +0200, Patrik Lundquist wrote:
On 14 July 2015 at 20:41, Hugo Mills h...@carfax.org.uk wrote:
On Tue, Jul 14, 2015 at 01:57:07PM +0200, Patrik Lundquist wrote:
On 24 June 2015 at 12:46, Duncan 1i5t5.dun...@cox.net wrote:
Regardless of whether 1 or huge
of the internal data structures).
Hugo.
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raw storage.
Hugo.
or do they need to be of the same replication scheme too ?
On Jun 27, 2015, at 10:34 AM, Vincent Olivier vinc...@up4.com wrote:
ok i’ll go home and rethink my life then ;)
On Jun 27, 2015, at 10:21 AM, Hugo Mills h...@carfax.org.uk wrote:
On Sat, Jun 27
in.
Are you thinking of the read-only flag? That's not the same thing
as the various UUID properties (e.g. parent) which can be used to
detemine if a subvolume was made using a snapshot.
Hugo.
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tried this one, because Samba and I get on like a house on fire(*).
Hugo.
(*) Screaming, shouting, people running away, emergency services.
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hugo@... carfax.org.uk | brimstone. Be prepared to make a nice cup of tea.
http
, but sticking a copy of what you've
discovered so far into bugzilla.kernel.org may help it not to get
lost.
Hugo.
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/write multiple files from/to different disks, so less
performance only for single-file-reads/writes
[3] using two disks, otherwise (totalDisks-failedDisks)/totalDisks
--
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hugo@... carfax.org.uk | Oh, she'll go all the way to the bottom if we don't
could further degrade).
What is your recommendation?
Physically remove the device from the array, mount with -o
degraded, optionally add the new device, and run a balance.
Hugo.
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is it ignored by send/receive or does send/receive
re-enacts” the journal exactly ?
It'll be ignored. The FS doesn't keep track of how it reached a
particular state -- only what that state is.
Hugo.
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of parity RAID repair code
in it.
I'll do a scrub later, for now I have to wait 20 hours for the raid rebuild
first.
You'll probably find that the rebuild is equivalent to a scrub anyway.
Hugo.
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hugo
On Wed, Jun 17, 2015 at 12:58:35PM +0200, Sander wrote:
Hugo Mills wrote (ao):
On Wed, Jun 17, 2015 at 12:16:54AM -0700, Marc MERLIN wrote:
I had a few power offs due to a faulty power supply, and my mdadm raid5
got into fail mode after 2 drives got kicked out since their sequence
cases, all you need to do is clean up one data chunk to
give the metadata enough space to work in. Instead of manually
iterating through several values of usage= until you get a useful
response, you can use limit=n to stop after n successful block
group relocations.
Hugo.
--
Hugo Mills
On Tue, Jun 16, 2015 at 01:13:40PM +, Holger Hoffstätte wrote:
Forking from the other thread..
On Tue, 16 Jun 2015 12:25:45 +, Hugo Mills wrote:
Yes. It's an artefact of the way that mkfs works. If you run a
balance on those chunks, they'll go away. (btrfs balance start
or once a month -- opinions vary (as do runtimes).
My fourth question, still within the same context: are there best
practices when using smartctl for periodically testing (long test,
short test) btrfs RAID devices?
I can't answer that one, I'm afraid.
Hugo.
--
Hugo Mills
.
In my big disk array at home, I have two 4-slot enclosures, and I
leave one of them empty specifically for this reason. It's a less
attractive proposition with only 4 slots in total, though.
Hugo.
--
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hugo@... carfax.org.uk | The same
.
Is this likely to give me ok-ish performance? What other
possibilities are there?
I would recommend benchmarking over time with your workloads, and
seeing how your performance degrades.
Hugo.
--
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hugo
performance? What other
possibilities are there?
I would recommend benchmarking over time with your workloads, and
seeing how your performance degrades.
Hugo.
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have to go in the FARv2 update, though.
However, since this patch doesn't rule out the above happening at
some future date, and I think it'll do the job as described above,
Reviewed-by: Hugo Mills h...@carfax.org.uk
for whatever little it's worth.
Hugo.
Reported-by: Neil Horman nhor
On Thu, Jun 11, 2015 at 01:16:26PM -0400, Josef Bacik wrote:
On 06/11/2015 01:09 PM, Hugo Mills wrote:
On Thu, Jun 04, 2015 at 05:17:25PM -0400, Josef Bacik wrote:
Neil Horman pointed out a problem where if he did something like this
receive A
snap A B
change B
send -p A B
3517706 top level 5 path var/tmp
ID 276 gen 3517669 top level 5 path .snapshots
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=190.00GiB, used=176.47GiB
System, DUP: total=32.00MiB, used=48.00KiB
Metadata, DUP: total=8.00GiB, used=6.08GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
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about which device(s) it's meant to be writing to.
Hugo.
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a filtered balance on it to clean up
unused chunks:
# btrfs balance start -dusage=5 /
as suggested in the FAQ [1].
Hugo.
[1]
https://btrfs.wiki.kernel.org/index.php/FAQ#if_your_device_is_large_.28.3E16GiB.29
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hugo
On Tue, May 26, 2015 at 09:29:25AM +, sri wrote:
Hugo Mills hugo at carfax.org.uk writes:
On Tue, May 26, 2015 at 08:45:06AM +, sri wrote:
Hi,
According to btrfs wiki page, under Stability status it is written
that
The filesystem disk format is no longer unstable
definitely support conversion to DUP, and prevent
the automatic upgrade to RAID-1, but I think we don't at the moment.
Hugo.
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on any one of the drives,
right?
Is that also true during reading of data, i.e. is the parity also
checked for read operations?
Parity is spread evenly across all devices, so a read of more than
a trivial quantity of data would almost certainly spin up all devices
anyway.
Hugo.
--
Hugo
GlobalReserve, single: total=512.00MiB, used=0.00B
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between the original block device and the snapshot, and
may try using the wrong one (or possibly both).
Hugo.
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On Mon, Apr 27, 2015 at 02:41:41PM +, sri wrote:
Hugo Mills hugo at carfax.org.uk writes:
On Mon, Apr 27, 2015 at 12:05:28PM +, sri wrote:
Hi,
I would like to know if btrfs file system is created on LVM2 logical
volumes, does freeze and thaw operations takes place
On Mon, Apr 27, 2015 at 10:34:42PM +0500, Roman Mamedov wrote:
On Mon, 27 Apr 2015 14:55:49 +
Hugo Mills h...@carfax.org.uk wrote:
This is strange considering that I wanted a consistent snapshot of
entire btrfs filesystem at volume level.
Is there a way to achive
the cryptsetup open
operation).
Hugo.
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the process to mount using chroot,
--max-errors N Terminate as soon as N errors happened while,
processing commands from the send stream.,
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) to select the subvolume
you want to mount. If you want to make a read-only snapshot into a
read-write one, you can simply snapshot it again without the -r
option.
Hugo.
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check --readonly on the filesystem
(unmounted), and report back what that says.
Hugo.
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I could fix
this issue?
See the first issue here: https://btrfs.wiki.kernel.org/index.php/Gotchas
Hugo.
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is of 5Mb.
So for incremetal backup, it consumes total of 11Mb.
I want a way to reduce it to total of 6Mb but there should a way to
recover from fist snapshot dump and second snapshot dump as well.
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http
On Sun, Apr 19, 2015 at 07:50:32PM +0200, Martin Steigerwald wrote:
Am Sonntag, 19. April 2015, 15:18:51 schrieb Hugo Mills:
On Sun, Apr 19, 2015 at 05:10:30PM +0200, Martin Steigerwald wrote:
Am Sonntag, 19. April 2015, 22:31:02 schrieb Craig Ringer:
I'm curious as to whether +C has any
On Sun, Apr 19, 2015 at 08:41:39PM +0200, Martin Steigerwald wrote:
Am Sonntag, 19. April 2015, 18:18:24 schrieb Hugo Mills:
On Sun, Apr 19, 2015 at 07:50:32PM +0200, Martin Steigerwald wrote:
Am Sonntag, 19. April 2015, 15:18:51 schrieb Hugo Mills:
On Sun, Apr 19, 2015 at 05:10:30PM
the checksumming
features of the FS, and hence the self-healing properties if you're
running with btrfs-native RAID.
Hugo.
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themselves), then it's already been done with
qgroups, and you don't need to write any btrfs code at all.
What exactly are you going to be doing with this information?
Hugo.
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to balance two drive btrfs raid1 to two drive btrfs raid5
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PGP: E2AB1DE4 | gdb
for working out what goes on which
disks, and you're done.
Hugo.
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, so there
probably isn't much BTRFS specific literature out there.
I would, however suggest looking at the FUSE drivers for ext4 and ZFS,
as those are both ported from kernel space, and should give some good
examples of where to start.
pnbsp;/ppnbsp;/p
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rootflags=subvol=root
Hugo.
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On Tue, Apr 07, 2015 at 01:08:59PM +0200, arnaud gaboury wrote:
On Tue, Apr 7, 2015 at 1:03 PM, Hugo Mills h...@carfax.org.uk wrote:
On Tue, Apr 07, 2015 at 12:58:28PM +0200, arnaud gaboury wrote:
[snip]
After more reading, it seems to me creating a top root subvolume is
the right thing
On Tue, Apr 07, 2015 at 06:31:36PM +0200, arnaud gaboury wrote:
On Tue, Apr 7, 2015 at 4:20 PM, Hugo Mills h...@carfax.org.uk wrote:
On Tue, Apr 07, 2015 at 01:08:59PM +0200, arnaud gaboury wrote:
On Tue, Apr 7, 2015 at 1:03 PM, Hugo Mills h...@carfax.org.uk wrote:
On Tue, Apr 07, 2015
://www.tux.org/lkml/#s3
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On Mon, Apr 06, 2015 at 10:40:03AM +0300, Pavel Volkov wrote:
On Sunday, April 5, 2015 1:04:17 PM MSK, Hugo Mills wrote:
That's these, I think:
#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL 5)
#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF(1ULL 6)
so it's definitely -O
On Sun, Apr 05, 2015 at 03:30:47AM +, Russell Coker wrote:
On Sun, 5 Apr 2015 03:16:21 AM Duncan wrote:
Hugo Mills posted on Sat, 04 Apr 2015 13:00:47 + as excerpted:
On Sat, Apr 04, 2015 at 12:55:08PM +, Russell Coker wrote:
As an aside are there options to mkfs.btrfs
mention be added to the man page.
Yes, there are. It's probably -O^extref, but if you can show the
dmesg output from the 3.2 kernel on the failed mount (so that it shows
what the actual failure was), we should be able to give you a more
precise answer.
Hugo.
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