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Ant P.
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PostPosted: Mon Oct 10, 2011 5:43 pm    Post subject: Reply with quote

Btrfs ate my netbook today. Unexpected power loss, when it came back it panicked on boot mounting the filesystem. Impossible to get a backtrace since most of it flies off the top of the screen, and AFAIK, btrfsck is a dummy command that doesn't actually fix anything. Back to ext4 for me then.

I guess I deserved the data loss for being naïve enough to use Oracle software in the first place ;)
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devsk
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PostPosted: Mon Oct 10, 2011 7:45 pm    Post subject: Reply with quote

pjp wrote:
btrfs remains under heavy development and is not yet intended for use where data loss is a problem or inconvenience. Using it at this point seems to be acceptance of such issues.


pjp wrote:
Anyway, as for trying ZFS, I've used ~arch way back when ('03 - '04) and had problems. I've decided to never do that again, so I only use stable. I'm also not interested in maintaining random overlays separately from portage (I find it to be a nuisance), and even less interested in maintaining custom ebuilds, especially of the critical variety. None of those scenarios are why I started using Gentoo, or continue using it.


Those two statements are contradictory. BTRFS is unstable at this time with no way to recover but you advocate it. ZFS is super stable but you don't want to use it just because its not in portage. Tells me you have a mental bias! But, to each their own!
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pjp
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PostPosted: Mon Oct 10, 2011 10:32 pm    Post subject: Reply with quote

I have not advocated for anyone to use btrfs.

As for what I have done, I've considered testing btrfs with data I don't care if I lose. I have installed btrfs in a virtual box, just to see how to interact with it (ZFS' cli is better IMO). In doing so, btrfs seems easier to implement currently than ZFS (without supported ebuilds, and purely from a package management point of view). If a supported ZFS ebuild comes along, I'd try it in a vm as well.

I'm glad you like ZFS. It seems appropriate for your situation and your tolerance for data loss.
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Ant P.
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PostPosted: Sat Oct 15, 2011 5:35 pm    Post subject: Reply with quote

I just found this on the Arch wiki, which let me salvage my SSD data.
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lkraav
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PostPosted: Sat Oct 15, 2011 5:41 pm    Post subject: Reply with quote

i just had a situation where a btrfs partition wouldnt mount. solution is to mount the partition with 2.6.38 kernel one time, for example systemrescuecd 2.1.1, so it could repair the log. waiting for pf-sources-3.1 ..
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kernelOfTruth
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PostPosted: Sun Oct 16, 2011 11:41 am    Post subject: Reply with quote

lkraav wrote:
i just had a situation where a btrfs partition wouldnt mount. solution is to mount the partition with 2.6.38 kernel one time, for example systemrescuecd 2.1.1, so it could repair the log. waiting for pf-sources-3.1 ..


O.o

had the same in the past & the only solution so far was to reformat, discard the data and backup again on that drive


Ant P.'s zeroing of the log also might work but could lead to data inconsistencies - hm, not a state to really rely on that filesystem solely :roll:


thanks !
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Ant P.
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PostPosted: Sat Oct 22, 2011 3:40 pm    Post subject: Reply with quote

There's nothing wrong with throwing away corrupt incomplete data after a crash, xfs does it by default and you just lose the last 15 seconds of data or so. The main difference is that does it automatically, instead of kernel panicking, forcing you hunt across google for an hour and then manually compile a non-default tool from a livecd to fix it...
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devsk
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PostPosted: Sat Oct 22, 2011 5:20 pm    Post subject: Reply with quote

Ant P. wrote:
There's nothing wrong with throwing away corrupt incomplete data after a crash, xfs does it by default and you just lose the last 15 seconds of data or so.
That's just plain wrong! Is that your definition of enterprise-ready filesystem? Do you have any idea how many transactions can be processed in 15 seconds?
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Simba7
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PostPosted: Sun Oct 23, 2011 4:42 pm    Post subject: Reply with quote

Ant P. wrote:
There's nothing wrong with throwing away corrupt incomplete data after a crash, xfs does it by default and you just lose the last 15 seconds of data or so. The main difference is that does it automatically, instead of kernel panicking, forcing you hunt across google for an hour and then manually compile a non-default tool from a livecd to fix it...

Let me make sure I *NEVER* hire you as a network or system administrator. Fifteen seconds of data can equal several tens of gigabytes in an enterprise environment.
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Ant P.
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PostPosted: Mon Oct 24, 2011 2:24 pm    Post subject: Reply with quote

devsk wrote:
That's just plain wrong! Is that your definition of enterprise-ready filesystem?

No, that's SGI's definition of an enterprise-ready filesystem. This has been its default behaviour for years. If you don't like it then RTFM and learn how to change the default.

devsk wrote:
Do you have any idea how many transactions can be processed in 15 seconds?

Simba7 wrote:
Let me make sure I *NEVER* hire you as a network or system administrator.

If you're even thinking of running mission-critical systems that can't tolerate 15 seconds of downtime on a standard Linux filesystem without redundancy and expecting not to lose data then I want to stay as far away from whatever company you work for as possible ;)
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devsk
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PostPosted: Mon Oct 24, 2011 2:47 pm    Post subject: Reply with quote

Ant P. wrote:
devsk wrote:
That's just plain wrong! Is that your definition of enterprise-ready filesystem?

No, that's SGI's definition of an enterprise-ready filesystem. This has been its default behaviour for years. If you don't like it then RTFM and learn how to change the default.
And that's exactly why it has such deep penetration in the enterprise world...:D
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ToeiRei
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PostPosted: Wed Nov 02, 2011 11:25 am    Post subject: Reply with quote

btrfs-progs know about scrubbing now. Just too bad you don't get the filename/path of the corrupted files yet... But that's about to come in Kernel 3.2 (patches queued up already, testing them now)

if you feel like you want to test stuff, here's what I did to patch:

Code:

cd /usr/src/linux
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=5da6fcbc4eb50c0f55d520750332f5a6ab13508c" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=4a54c8c165b66300830a67349fc7595e3fc442f7" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=2774b2ca3d49124bf1ae89e8d575b3dab4221266" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=1503140d3ec2be9b917d2f8f7c64cb77b79a215b" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=a1d3c4786a4b9c71c0767aa656a759968f7554b6" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=d7728c960dccf775b92f2c4139f1216275a45c44" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=0ef8e45158f97dde4801b535e25f70f7caf01a27" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=e12fa9cd390f8e93a9144bd99bd6f6ed316fbc1e" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=8ddc7d9cd0a00062247c732b96386ec2462bdbc7" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=193ea74b2729e6ddc08fb6bde6e15a3bd4d94071" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=558540c17771eaf89b1a3be39aa2c8bc837da1a6" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=13db62b7a1e8c64763a93c155091620f85ff8920" | patch -p1
curl -s "http://git.jan-o-sch.net/?p=btrfs-unstable;a=patch;h=a542ad1bafc7df9fc16de8a6894b350a4df75572" | patch -p1


Compile, reboot and test :)
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Simba7
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PostPosted: Sat Nov 05, 2011 11:02 pm    Post subject: Reply with quote

So.. Does btrfs now use a flat 2GB for metadata use?

Also, is there going to be a sparc64 edition? I picked up (5) SunFire V100's (1GB RAM/80GB HDD) that I wouldn't mind throwing Gentoo on.
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hasufell
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PostPosted: Sun Nov 06, 2011 9:30 pm    Post subject: Reply with quote

Ant P. wrote:
Btrfs ate my netbook today. Unexpected power loss, when it came back it panicked on boot mounting the filesystem. Impossible to get a backtrace since most of it flies off the top of the screen, and AFAIK, btrfsck is a dummy command that doesn't actually fix anything. Back to ext4 for me then.

I guess I deserved the data loss for being naïve enough to use Oracle software in the first place ;)

got the same and solved it by clearing the journal

http://www.funtoo.org/wiki/BTRFS_Fun#In_last_resort:_clearing_the_BTRFS_journal
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kernelOfTruth
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PostPosted: Wed Nov 09, 2011 12:37 am    Post subject: Reply with quote

git approach:

linux-kernel 3.1 with latest btrfs-changes on top

for those who're not so experienced with git yet (like me recently ^^)


Code:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git linux-btrfs

cd linux-btrfs

git branch --track for-linux origin/for-linus

git checkout for-linus

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tclover
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PostPosted: Wed Nov 09, 2011 1:43 pm    Post subject: Impressive? Reply with quote

Yeah, that huge commit seems promising for many fixes... although his last comment on btrfs "eating his data" with no possibility/time for fixes before pulling his request is not that appealing. I'd look at you guys--who are using btrfs--with a little distance with your "eaten data" funny stories before making any move to btrfs.

But hey, again, that pull request is impressive! and it's normally trouble free on top of 3.1.
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kernelOfTruth
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PostPosted: Wed Nov 09, 2011 3:25 pm    Post subject: Reply with quote

still not ready for production / normal backup purpose:

Quote:
[ 8189.430062] ------------[ cut here ]------------
[ 8189.430103] Kernel BUG at ffffffff812beaa7 [verbose debug info unavailable]
[ 8189.430151] invalid opcode: 0000 [#1] PREEMPT SMP
[ 8189.430204] CPU 4
[ 8189.430221] Modules linked in: radeon ttm drm_kms_helper drm i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect iptable_filter ip_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore e1000e i7core_edac wmi i2c_i801 snd_page_alloc libphy e1000 auth_rpcgss lockd sunrpc scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage ehci_hcd [last unloaded: nfs_acl]
[ 8189.430752]
[ 8189.430766] Pid: 10477, comm: btrfs-transacti Not tainted 3.1.0-btrfs++ #1 Packard Bell ipower G3710/FMP55
[ 8189.430841] RIP: 0010:[<ffffffff812beaa7>] [<ffffffff812beaa7>] btrfs_delalloc_release_metadata+0xf7/0x100
[ 8189.430914] RSP: 0018:ffff8801c8c99c70 EFLAGS: 00010246
[ 8189.430952] RAX: 0000000000000000 RBX: ffff880232981000 RCX: 0000000000f70a14
[ 8189.431002] RDX: 0000000000f70a04 RSI: 0000000000009000 RDI: ffff88016fd9c42c
[ 8189.431051] RBP: ffff88016fd9c42c R08: ffffffff812d5ae3 R09: ffff8801c8c99b00
[ 8189.431101] R10: 0000000000000009 R11: 0000000000000008 R12: 0000000000009000
[ 8189.431150] R13: ffff88016fd9c5a0 R14: 0000000000001000 R15: ffff8801dd43ca20
[ 8189.431200] FS: 0000000000000000(0000) GS:ffff88023fd00000(0000) knlGS:0000000000000000
[ 8189.431256] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 8189.431296] CR2: 0000257b1355b000 CR3: 0000000001c35000 CR4: 00000000000006e0
[ 8189.431345] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 8189.431394] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 8189.431444] Process btrfs-transacti (pid: 10477, threadinfo ffff8801c8c98000, task ffff880232735cc0)
[ 8189.431506] Stack:
[ 8189.431521] ffff880232981000 ffff88016fd9c5a0 ffff88015a654500 ffff8801dd723ca8
[ 8189.431583] 00000000ffffffff ffffffff81306924 0000000000000000 0000000000009000
[ 8189.431644] ffff88016fd9c5a0 ffff880232981000 ffff8801dd723ca8 ffff88016fd9c5a0
[ 8189.431705] Call Trace:
[ 8189.431727] [<ffffffff81306924>] ? btrfs_write_out_ino_cache+0xc4/0xd0
[ 8189.431790] [<ffffffff812c7a1e>] ? btrfs_save_ino_cache+0x17e/0x280
[ 8189.431817] [<ffffffff812cf4b8>] ? commit_fs_roots.isra.26+0xb8/0x170
[ 8189.431865] [<ffffffff813179b0>] ? btrfs_scrub_pause+0xf0/0x100
[ 8189.431907] [<ffffffff812d0230>] ? btrfs_commit_transaction+0x3c0/0x7c0
[ 8189.431948] [<ffffffff81068860>] ? add_wait_queue+0x60/0x60
[ 8189.431985] [<ffffffff812d0a39>] ? start_transaction+0x89/0x290
[ 8189.432058] [<ffffffff812c91cd>] ? transaction_kthread+0x24d/0x260
[ 8189.432097] [<ffffffff812c8f80>] ? btrfs_congested_fn+0xc0/0xc0
[ 8189.432137] [<ffffffff8106810e>] ? kthread+0x7e/0x90
[ 8189.432167] [<ffffffff8169f874>] ? kernel_thread_helper+0x4/0x10
[ 8189.432201] [<ffffffff81068090>] ? kthread_worker_fn+0x180/0x180
[ 8189.432237] [<ffffffff8169f870>] ? gs_change+0xb/0xb
[ 8189.432263] Code: 00 00 4c 8b 74 24 20 48 83 c4 28 e9 84 fb ff ff 0f 1f 40 00 4c 89 ef 31 d2 e8 06 85 ff ff 48 89 ef 49 89 c5 e8 2b ec 3d 00 eb b0 <0f> 0b 0f 1f 80 00 00 00 00 48 83 ec 28 48 89 5c 24 18 48 89 fb
[ 8189.432540] RIP [<ffffffff812beaa7>] btrfs_delalloc_release_metadata+0xf7/0x100
[ 8189.432581] RSP <ffff8801c8c99c70>
[ 8189.450827] ---[ end trace 1b95a00d25cebed8 ]---


afaik this happens with inode_cache enabled pretty reliably

[3.0+]

no time for a in-depth bug report *sigh* :(


will try again & see if this also happens with the inode cache disabled ...



edit:

ok, not inode_cache related - but inode_cache seems to speed up transfers up significantly

still happening

looks like a regression or BUG introduced by 3.0 kernel series


back to ZFS for now until someone else who has time stumbles over this issues reproducibly & can go through it with the devs and test fixes :\
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hasufell
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PostPosted: Tue Dec 06, 2011 3:21 pm    Post subject: Reply with quote

after about 3 months of using btrfs on rootfs i gave up and switched back to ext4.

The systems is often unresponive and I even got serious slowdowns (cant really move mousepointer) when doing "emerge --sync", not to mention rsync...
Sometimes there are very long write-operations and I can't even tell why.

with ext4... all that stuff is gone, so it's definitely not just imagination.
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Dont Panic
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PostPosted: Tue Dec 06, 2011 5:08 pm    Post subject: Reply with quote

I've seen several posts on the Btrfs Mailing List regarding slowdowns.

I've never experienced it myself.

But they've been having a hard time nailing that issue down since it's hard to replicate. And it seems like every time they think they have it fixed, it crops back up again in a month or two.
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PostPosted: Wed Dec 07, 2011 7:32 pm    Post subject: Reply with quote

maybe it performs differently on storage partitions
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Small_Penguin
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PostPosted: Tue Dec 20, 2011 11:20 pm    Post subject: Reply with quote

I wanted to try btrfs with lzo compression for /usr/portage, hoping for the compression to speed things up.
Its partition size is only 512MiB. Unfortunately, the data does not even fit with btrfs. What a showstopper!

However, using ext4 with 1024 block size: /dev/sdb5 519412 376850 142562 73% /usr/portage

It's a pity ext4 can't do compression. However, both its stability and configurability are great and I had no problems so far.
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PostPosted: Sun Jan 01, 2012 12:40 am    Post subject: Reply with quote

Small_Penguin wrote:
I wanted to try btrfs with lzo compression for /usr/portage, hoping for the compression to speed things up.
Its partition size is only 512MiB. Unfortunately, the data does not even fit with btrfs. What a showstopper!

However, using ext4 with 1024 block size: /dev/sdb5 519412 376850 142562 73% /usr/portage

It's a pity ext4 can't do compression. However, both its stability and configurability are great and I had no problems so far.


You need to enable the "-M" option when creating a small partition with btrfs. Otherwise it will use a lot of space for metadata. Regarding compressing /usr/portage you should probably use something like squashfs.
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PostPosted: Thu Jan 19, 2012 8:36 pm    Post subject: Reply with quote

darklegion wrote:
Small_Penguin wrote:
I wanted to try btrfs with lzo compression for /usr/portage, hoping for the compression to speed things up.
Its partition size is only 512MiB. Unfortunately, the data does not even fit with btrfs. What a showstopper!

However, using ext4 with 1024 block size: /dev/sdb5 519412 376850 142562 73% /usr/portage

It's a pity ext4 can't do compression. However, both its stability and configurability are great and I had no problems so far.


You need to enable the "-M" option when creating a small partition with btrfs. Otherwise it will use a lot of space for metadata. Regarding compressing /usr/portage you should probably use something like squashfs.


mkbtrfs
Code:
usage: mkfs.btrfs [options] dev [ dev ... ]
options:
    -A --alloc-start the offset to start the FS
    -b --byte-count total number of bytes in the FS
    -d --data data profile, raid0, raid1, raid10 or single
    -l --leafsize size of btree leaves
    -L --label set a label
    -m --metadata metadata profile, values like data profile
    -n --nodesize size of btree nodes
    -s --sectorsize min block allocation
Btrfs Btrfs v0.19


Don't see -M here. Can you tell me where one needs to enable -M option ? Thanks.
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kernelOfTruth
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PostPosted: Fri Jan 20, 2012 6:51 pm    Post subject: Reply with quote

it should be

mkfs.btrfs -d single -m single /dev/foo

what you're looking for ...
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PostPosted: Fri Jan 20, 2012 6:54 pm    Post subject: Reply with quote

kernelOfTruth wrote:
it should be

mkfs.btrfs -d single -m single /dev/foo

what you're looking for ...


Thanks for that. I will use it next time when I create btrFS. I already ran mkbtrfs on a device w/o any options yesterday. :(
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