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happosai
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Joined: 17 Aug 2005
Posts: 33

PostPosted: Fri Mar 06, 2015 9:14 am    Post subject: Reply with quote

Of course Btrfs is buggy!

And while it is being marked "stable" in the kernel that doesn't automatically mean that it is production ready yet. Most of the core features by today are being considered stable; others are not. Btrfs is still a heavy work in progress, with getting new features almost added with every new kernel release and the bugs ironed out in the months to come after that. RAID5/6 for example is happening right now.

And of course it is not production ready yet! For Btrfs you've got to stay always with the latest and greatest kernel; something many people just don't want to happen on their production environment.

And to quote their own FAQ: "Is btrfs stable?

Short answer: No, it's still considered experimental.

Long answer: Nobody is going to magically stick a label on the btrfs code and say "yes, this is now stable and bug-free". Different people have different concepts of stability: a home user who wants to keep their ripped CDs on it will have a different requirement for stability than a large financial institution running their trading system on it. If you are concerned about stability in commercial production use, you should test btrfs on a testbed system under production workloads to see if it will do what you want of it. In any case, you should join the mailing list (and hang out in IRC) and read through problem reports and follow them to their conclusion to give yourself a good idea of the types of issues that come up, and the degree to which they can be dealt with. Whatever you do, we recommend keeping good, tested, off-system (and off-site) backups."

There have been at last four major show stoppers/bugs which happened last year in the kernel, which needed to be adressed. Stuff that shouldn't happen on a production ready all purpose general file system.

Just read the Blog of Russel Coker from Australia with his experiences about Btrfs: http://etbe.coker.com.au/2014/12/05/btrfs-status-dec-2014/ He does consider 90 days of running without problems on his file servers a big amount of time!

Take a look at the people from CoreOS; they used Btrfs for over one year as default file system, before they ditched it in favor for something more stable, namely Ext4+the new OverlayFS. Reasons for the switch: the users have been annoyed by wrong "out of space" errors, metadata rebelancing problems and generally overall slow performance.

Don't get me wrong: Btrfs has the potential to become the next standard file system of Linux because of it's unique feature set; but I don't see this happen in the next three years.
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e3k
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Joined: 01 Oct 2007
Posts: 362
Location: Inner Space

PostPosted: Tue Feb 23, 2016 8:45 pm    Post subject: Re: filesystem performance degradation Reply with quote

krinn wrote:
e3k wrote:
should i expect something similar with btrfs after a year?

Certainly not, you will not manage to use it a full year without loosing your data so you won't have time to see something like that appears.
The only crown btrfs own is the buggiest fs that exist.
(i'll not make friends with btrfs lovers)

confirmed. btrfs survived many cold shutdowns at my place and nothing happened. now it was a clean shutdown and the only unusual operation was copying some file to an old mp3 player and i can not boot gentoo anymore. fsck shows 400 errors. repair. fsck shows again 400 errors...

lets see if i can recover some data from the broken fs. i have a partial backup on some other disc. next time i use ext4 again.

written from debian on some old slow atom pc ..
---
@krynn: it was more than a year ;)
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krinn
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Joined: 02 May 2003
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PostPosted: Wed Feb 24, 2016 12:38 am    Post subject: Reply with quote

yeah sorry for the bad date guess :)
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e3k
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Joined: 01 Oct 2007
Posts: 362
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PostPosted: Sun Mar 06, 2016 7:15 pm    Post subject: Reply with quote

krinn wrote:
yeah sorry for the bad date guess :)

after all it was a hw failure. probably electronics. the disk does go click click click. not visible in bios. sata link reset in kernel. i do not have the receipt/or cant find it anymore. Not sure if it is possible to bring this to the manufacturer WD. disc still in waranty 5y.

writing from a new gentoo instalation. the docs did not suck as i expected. my compliments. but i did not get the thing with --autoumask-write where it is all written to some present file. currently it is named: /etc/portage/package.use/iputils. what is iputils? it reminds me of netfilter somehow.

eselect profile is Desktop.

---edit---2018---

and the moral of that story was that reformating EXT4 brings you back performance on a rotational disk device.
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