Hi again list,
I've seen in a message dating back to january that offline deduplication
has been implemented in BTRFS, but I can't find it in my btrfs-tools
0.19+20100601-3ubuntu2
Has it reached release, or not yet ? How could I give it a try ?
I've seen a discussion about whether deduplication
Hi list,
I'm a new BTRFS user and will try not to ask FAQs ;-)
I'm currently using Btrfs v0.19 on stock Ubuntu Natty (kernel 2.6.38)
and use a BTRFS inside an encrypted LVM.
The wiki gotchas page https://btrfs.wiki.kernel.org/index.php/Gotchas
states :
« btrfs volumes on top of dm-crypt block
Le jeudi 12 mai 2011 à 11:40 -0400, Josef Bacik a écrit :
Did you happen to get dmesg from that? It seems that you got disk
errors while writing out the supers, which points to a hardware
problem, but having the full dmesg would be good to say for sure.
Thanks,
What I got in syslog is
Hi,
Le jeudi 12 mai 2011 à 11:42 -0400, Josef Bacik a écrit :
...So I've turned my write cache off, but I notice this is stated for
kernel 2.6.33, so wonder if this still is an issue with 2.6.38, or has
it been addressed since ?
If you mount and start writing and don't see a message in
Hi Fajar,
Le vendredi 13 mai 2011 à 13:54 +0700, Fajar A. Nugraha a écrit :
Well, first of all, btrfs is still under heavy development.
The wiki https://btrfs.wiki.kernel.org/index.php/Main_Page says in bold:
« Btrfs is under heavy development, but every effort is being made to
keep the
Le vendredi 13 mai 2011 à 16:16 +0700, Fajar A. Nugraha a écrit :
IIRC 2.6.38 has a bug in that you can't use mount option subvol=...
if the fs/subvolume is newly created, while 2.6.39 works fine. At
least that's what I experienced, so now I use subvolid to select
subvolume.
# uname -a
Linux
Le vendredi 13 mai 2011 à 16:16 +0700, Fajar A. Nugraha a écrit :
if you encounter problems try to use latest available kernel for Natty
first. If it doesn't work, try latest vanilla kernel from kernel.org.
When I was younger I used to spend days compiling and installing and
testing things,
Hi, I was wondering about BTRFS memory needs. For example ZFS is known
to have a huge memory footprint, so it is not advisable on systems with
little RAM.
I was wondering about BTRFS, and couldn't find anything in the FAQ...
TIA.
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Hi Helmut,
Le vendredi 13 mai 2011 à 21:50 +0200, Helmut Hullen a écrit :
That may depend on the mkfs.btrfs options - which options have you
set?
Well, actually none, except for -L ;-)
What tells
df -t btrfs
btrfs filesystem show
root@tethys:~# df -t btrfs
Sys. de
Le dimanche 15 mai 2011 à 11:43 +0200, radame...@freenet.de a écrit :
since btrfs uses cow I wonder how I can erase confidential data.
Replacing the file does not work, since the new content is written to new
blocks while the old confidential content remains in its old block (which
may be
Le dimanche 15 mai 2011 à 19:28 +0200, Helmut Hullen a écrit :
shows that that device with brutto 150 GByte is nearly full with its
78 GByte (or 73 GByte) data because it uses this kind of RAID1?
No. Here's the current situation on same machine :
# btrfs fi df /
Data: total=85.01GB,
Le dimanche 22 mai 2011 à 10:34 +0100, Stephane Chazelas a écrit :
I noticed that whenever I do sync, btrfs will write for around 6.5s and
write 13 MB (see below).
[...]
I had also noticed here, without really paying further attention, that
external USB HDs with a BTRFS mounted, but
?
TIA.
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it ?
- Is there a risk that it causes data loss or corruption ?
TIA.
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88003b84bb48
mars 08 08:22:02 tethys kernel: ---[ end trace 718b3fc11b4d9241 ]---
HTH, TIA.
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of my laptops that has a SSD...
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A bus station is where buses stop. A train station is where trains stop.
On my desk, there is a workstation...
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, at least...)
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. The timescales are just quite long.
If the timescales become really too long, people with just end keeping with
the idea that BTRFS is not ready for production and won't be any previsible
time soon...
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Le lundi 10 mars 2014 02:16:01 vous avez écrit :
Does the filesystem pass the btrfsck?
If not, would you please try btrfsck first?
It passes scrub with 0 errors... Do I need to bring it offline to pass btrfsck
anyway ?
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looking for, you will have multiple of these. Thanks,
Josef
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and operate, to the point it has become hardly usable :-(
I would have thought a rebalance would have improved the filesystem
organization, looks like it's the absolute contrary :-(
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?
- Generally speaking, does LZO compression improve or degrade performance ?
I'm not able to figure it out clearly.
TIA for the insight.
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snapshots good at ??
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with HD LED steady
lit, that booting bhas become so long that the GUI DM dies of timeout before
it even starts, and you have to restart it manualle... you can tell it's gone
sloow without any benchmark figures...
(Disk health good on all machines...)
Go figure...
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, and
you shouldn't drive too much in cities as it will smoke too much... and not
too much motorways either as the motor might heat a bit too much.
I need a filesystem that fits me, I don't want to have to fit my filesystem :-\
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, and forget it, and not to
reformat everything again in a month or so (as soon as I will tell myself : «
Well, the improvements promised by kernel 3.14 are still far behind my
usability needs »)...
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[-d] /'.
root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
scrub started at Mon Apr 7 09:49:48 2014, running for 693 seconds
total bytes scrubbed: 34.06GiB with 0 errors
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Sorry, I meant kernel 3.13 :-)
Linux zafu 3.13.8-1-ARCH #1 SMP PREEMPT Tue Apr 1 12:19:51 CEST 2014 x86_64
GNU/Linux
Le lundi 7 avril 2014 10:32:04 Swâmi Petaramesh a écrit :
Hi there,
Machine got rebooted while scrub was in process, and now it looks like a
scrub zombie...
How do I
Install Script : Yes
Validated By : Signature
Thanks again :-)
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signature.asc
Description: This is a digitally signed message part.
in the snapshot as well,
efectively defeating the snapshot ?
2/ Being snapshotted, will the database be COWed even though it's supposed to
be noCow ?
3/ Are both options mutually incompatible in some more osbcure ways ?
I'd like to know where I'm going with this ;-)
TIA and kind regards.
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, since snapshots stop at the subvolume
boundary. That gives NOCOW a chance to actually *BE* NOCOW.
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*minutes*
...Hope this may help hunting this down...
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]---
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?
Is there any pro/cons currently, on a 3.14 kernel, about using BTRFS along
with an SSD ?
Is there specific advice about leaf size, use of compression, snapshots,
(auto-)defrag etc, that might be relevant especially for SSDs ?
TIA.
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both of them on an LVM itself luks-
encrypted using dm-crypt.
All my machines have been made this way for *years*, so I know it works damn
well ;-)
...And it also allows for hibernateing the system to (encrypted) swap space...
That's a pretty fine setup :-)
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Le jeudi 5 juin 2014 17:59:48 Christoph Anton Mitterer a écrit :
Be aware, that discard used with dm-crypt may have security
implications.
Thanks, I knew :-)
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Le sage n’est pas celui qui discrimine, c’est celui qui
it be advisable to change
metadata to SINGLE using a rebalance, or if I'd better just leave things the
way they are...?
TIA for any insight.
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Tout le malheur des hommes vient de ce qu'ils ne vivent pas dans _le_ monde
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, will create entirely different binary
ciphertext, so for sure both metadata copies will always be different and
cannot be deduped by SSD firmware...
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Les êtres humains, cernés par leurs besoins, s'agitent
interesting :-}
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Avant qu'une personne n'étudie le Zen, les montagnes sont les montagnes,
les eaux sont les eaux. Après un premier aperçu de la vérité du Zen, les
montagnes ne sont plus les montagnes, les eaux ne sont plus les
Hi list,
I don't trust theoretical benchmarks that much and prefer real-life
benchs on the occasion, so here's mine:
Given 4 laptops, the most powerful of which was running BTRFS and the
others ext3 or ext4, all machines running Ubuntu 11.04 Natty 32-bit with
a stock Ubuntu 2.6.38-11
my mail, browse
the web, etc, definitely do not correspond to what BTRFS was designed for.
(Sorry for the rant, but this really pisses me off...)
So I'm only wonderign whether I reformat my system to ext4 or ZFS, and whether
I do it right now or on thursday...
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a memory-hungry system running damn slow... For the
time being I will stick to ZFS for 64-bit machines with = 4GB RAM, and to
ext4 for 32-bit systems with less RAM...
I don't feel that BTRFS gives any advantage in its current state of
development. Alas.
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regards.
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a écrit :
On Sun, 22 Jul 2012 17:06:24 +0200
Swâmi Petaramesh sw...@petaramesh.org wrote:
Hi,
I've created a small BTRFS filesystem, where metadata+data are mixed
(and metadata are not DUP'ed).
Then I've enlarged the FS to 1 GB ; now I'd like to make it normal
with separate data and metadata
upon this one as well.
That's typically the kind of bug that makes one wonder to what extent
the software has ever been tested, and doubt it's anything close to
production quality... :-/
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Hi there,
I noticed my syslog is filling up with tons of:
btrfs: free space inode generation (0) did not match free space cache
generation (25326)
...any clue ?
TIA.
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Le 19/09/2012 18:01, Josef Bacik a écrit :
Yeah I need to just put those under a DEBUG ifdef, they aren't a big
deal, just letting you know that the on disk cache is invalid and it
will have to put it together ye olde fashioned way.
...But is it supposed to, and how to fix it ?
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trees (corresponding to removed snapshots
as far as I could tell) were b0rked, and btrfsck couldn't help...
So I lost the FS - and lost quite a bit of confidence into BTRFS the
same day... :-\
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btree space waste bytes: 382927315
file data blocks allocated: 103024238592
referenced 102409895936
Btrfs Btrfs v0.19
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was back to BTRFS, and I wouldn't have to
revert back again :-/
Any advice or help greatly appreciated.
TIA.
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0 0
/dev/VG1/BTR_POOL/data/VBOX_VMSbtrfs
subvol=DATA/VBOX_VMS,space_cache,compress=lzo,noatime0 0
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will be enough, when I see my BTRFS is
currently about 8x slower than what ext4 user to...
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UBUNTU/@home/.snapshots/624/snapshot
ID 3239 top level 5 path STORAGE/.snapshots/659/snapshot
ID 3240 top level 5 path UBUNTU/@/.snapshots/626/snapshot
ID 3241 top level 5 path UBUNTU/@home/.snapshots/625/snapshot
ID 3242 top level 5 path STORAGE/.snapshots/660/snapshot
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of the
prominent purposes for which I use BTRFS, and the number of snapshots
would grow immediately again, as I use the excellent OpenSuSE snapper
tool, that makes a snapshot every single hour...
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as far as RAM is concerned (just booting into a standard Ubuntu
GUI and then accessing emailn, browser, office applications etc.)
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that it's painfully slow.
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More
not ? That's to bad :-(
I fear that both the combination of autodefrag and the high number of
snapshot could be the root-cause of the the bad performance.
As a test, I will try to remove *most* of my snapshots and see if it
helps...
Thanks for the suggestion !
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and swift.
So it seems that the number or active snapshots (or is it the number of
subvols whatsoever ??) dramatically impacts performance...
Thanks for the suggestion.
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their cache ignored...?)
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Hi there,
On a performance standpoint - and on Ubuntu Quantall kernel 3.5.0-17 -
is it advisable to mount BTRFS with inode_cache ?
Is there any risk or counterpart doing so ?
TIA, kind regards.
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.
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Le 11/11/2012 15:05, Bart Noordervliet a écrit :
which kernel version are you running?
Hi Bart,
# uname -srv
Linux 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012
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tomorrow morning (and #me
having slept at night... ;-)
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of the caches
from your fstab and kernel command line before you next mount the FS.
Hugo.
Thanks very much Hugo, I'll give this a try. Should I assume that the
cache clearing / building is complete as soon as the disk is idle ?
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Ne
...
But for now I have to admit that I regret my choice performance wise
(which is terrible...) and stability wise (Already 2 reinstalls with
complete format, if there's a next one, the next one will be ZFS...)
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Ne
.
Unfortunately, same issue after applying your suggestions...
[ 752.943532] btrfs: free space inode generation (0) did not match free
space cache generation (203710)
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loading of the DB took
them a couple hours... With BTRFS it's been 5x24 hours and counting... :-(
This filesystem is pure crap as soon as it comes to database processing :-(
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distro's kernel, or
using vanilla ones. Been there, done that. No more suffering for me
please ;-))
I'll have to stick with current Ubuntu kernel, or at least with a future
backport...
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, what is the effect of nocow with respect to snapshots ? I would
assume that then, snapshots contain the current data ?
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release... If not, maybe in a year... Or a
couple years... Well...
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.
Is it to expect that somewhere in the future, BTRFS will be able to
defragment itself without duplicating snapshot data ?
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Hi there,
A couple days ago, I have converted my Ubuntu Precise machine from ext4
to BTRFS using btrfs-convert.
I currently use kernel:
Linux fnix 3.2.0-26-generic #41-Ubuntu SMP Thu Jun 14 17:49:24 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
...and a btrfs-tools package more recent than the
regards.
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to re-enable the snapshot-awareness of defrag anytime soon ?
TIA.
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=106.00GiB, used=88.28GiB
System, DUP: total=32.00MiB, used=24.00KiB
Metadata, DUP: total=1.00GiB, used=520.36MiB
unknown, single: total=176.00MiB, used=0.00
# btrfs --version
Btrfs v3.14.2
# uname -r
3.15.5-200.fc20.x86_64
TIA, kind regards.
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] ?
kthread_create_on_node+0x1b0/0x1b0
juil. 19 09:12:57 zafu kernel: [81515efc] ret_from_fork+0x7c/0xb0
juil. 19 09:12:57 zafu kernel: [8108d350] ?
kthread_create_on_node+0x1b0/0x1b0
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something could seriously break in
the end...
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1f 00 0f
0b
66 0f 1f 44 00 00 0f 0b 66 0f 1f 44 00 00 0f 0b 4c 89 f7 e8 ae 3a 05 00 8b 45
d0 eb aa
sept. 13 16:20:04 tethys kernel: RIP [a0181457]
walk_down_proc+0x317/0x330 [btrfs]
-- Reboot --
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
doesn't surprise me at all, it's « slow performance », indeed,
although I'm myself more accustomed to « incredibly fscking damn slow
performance »...
HTH
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
Un homme ne doit pas avaler plus de bobards qu'il ne peut en
nt eract_with_direct_IO_or_COW.3F
ah, sorry, I somehow overlooked this.
Thanks
Marc
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
Tout être manifesté est là pour embaumer, pour exprimer la Présence.
-- Jean-Marc Mantel
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corruption occurs, should I expect it to affect snapshots only, or
the whole system ?
TIA for any insight.
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Le dimanche 2 novembre 2014 10:49:52 Hugo Mills a écrit :
I'm a little lost with latest kernel issues, and would like to know if
the data corruption with RO snapshots is fixed in 3.17.2, or not yet ?
Yes, it is.
Thank you Hugo :-)
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Swâmi Petaramesh sw...@petaramesh.org http
:12:32 vajra kernel: [810b5210] ?
kthread_create_on_node+0x1a0/0x1a0
déc. 01 12:12:32 vajra kernel: ---[ end trace f1f27f48a0abdf73 ]---
...etc.
Any indight / help much appreciated.
TIA and kind regards.
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
:32 vajra kernel: [810b5210] ?
kthread_create_on_node+0x1a0/0x1a0
déc. 01 12:12:32 vajra kernel: ---[ end trace f1f27f48a0abdf73 ]---
...etc.
Any indight / help much appreciated.
TIA and kind regards.
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
trace 449348f354fd5be5 ]---
déc. 04 08:51:59 vajra abrt-dump-journal-oops[1249]: abrt-dump-journal-oops:
Found oopses: 1
déc. 04 08:51:59 vajra abrt-dump-journal-oops[1249]: abrt-dump-journal-oops:
Creating problem directories
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP
-server[11581]: Deleting problem directory
oops-2014-12-05-14:28:42-1102-0 (dup of oops-2014-12-01-12:12:02-1332-0)
déc. 05 14:28:43 vajra abrt-dump-journal-oops[1102]: Reported 1 kernel oopses
to Abrt
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
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on /storage type btrfs
(rw,relatime,subvol=STORAGE,autodefrag,compress=lzo)
/dev/mapper/VG1-BTR_POOL on /data/BIG type btrfs
(rw,noatime,subvol=DATA/BIG,compress=lzo)
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
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...
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Le 27/12/2012 20:27, Gene Czarcinski a écrit :
Oh thanks for that little reminder that you can put btrfs on an LV.
That's an installation over a LUKS-encrypted LVM for everything except
for /boot, which lies on a separate ordinary partition...
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Swâmi Petaramesh sw...@petaramesh.org http
. UBUNTU/@boot,
LMDE/@boot etc...
Works just great.
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/initrd.img-3.5.0-24-generic
/boot/initrd.img-3.5.0-24-generic: 3 extents found
Any clue appreciated ;-)
TIA.
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1792
11792 12704495840 3712
2550421832 130756 65 eof
/boot/initrd.img-3.5.0-24-generic: 3 extents found
I'm puzzled...
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copy of
the defragged data ?
TIA.
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= 2.6.37, I should however not defrag until the
patch you mention is actually merged in a future kernel release ?
TIA.
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
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recent
kernel than the one that Ubuntu 13.04 will have would give me huge speed
improvements or features I need much - (and I assume that being able to
defrag, with my snapshots, would be a good reason for me...)
Kind regards.
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP
not (currently) running a headless
generic server for which my main and only concern would be BTRFS...
So I try to stick to the very old - albeit maximum 6 months old ! -
stock Ubuntu kernel...
Well... Sometimes I upgrade to next Beta :-]
Kind regards.
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Swâmi Petaramesh sw...@petaramesh.org
is just a PPA and 2 apt-get install commands away... It
will definitely be easier than start playing with mainline PPA Ubuntu
kernels...
Kind regards.
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Swâmi Petaramesh sw...@petaramesh.org http://petaramesh.org PGP 9076E32E
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