From: Chris Murphy <lists@colorremedies.com>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: experiences running btrfs on external USB disks?
Date: Mon, 3 Dec 2018 22:59:08 -0700 [thread overview]
Message-ID: <CAJCQCtRCu5ED+L+j0vWaiPO1ujm=MpMTxD1OvW1v3ZYpT_SMyw@mail.gmail.com> (raw)
In-Reply-To: <e94da83b0a57c01663ad1e40fa6b9b5e@wpkg.org>
On Mon, Dec 3, 2018 at 10:44 PM Tomasz Chmielewski <mangoo@wpkg.org> wrote:
>
> I'm trying to use btrfs on an external USB drive, without much success.
>
> When the drive is connected for 2-3+ days, the filesystem gets remounted
> readonly, with BTRFS saying "IO failure":
>
> [77760.444607] BTRFS error (device sdb1): bad tree block start, want
> 378372096 have 0
> [77760.550933] BTRFS error (device sdb1): bad tree block start, want
> 378372096 have 0
> [77760.550972] BTRFS: error (device sdb1) in __btrfs_free_extent:6804:
> errno=-5 IO failure
> [77760.550979] BTRFS info (device sdb1): forced readonly
> [77760.551003] BTRFS: error (device sdb1) in
> btrfs_run_delayed_refs:2935: errno=-5 IO failure
> [77760.553223] BTRFS error (device sdb1): pending csums is 4096
>
>
> Note that there are no other kernel messages (i.e. that would indicate a
> problem with disk, cable disconnection etc.).
>
> The load on the drive itself can be quite heavy at times (i.e. 100% IO
> for 1-2 h and more) - can it contribute to the problem (i.e. btrfs
> thinks there is some timeout somewhere)?
>
> Running 4.19.6 right now, but was experiencing the issue also with 4.18
> kernels.
>
>
>
> # btrfs device stats /data
> [/dev/sda1].write_io_errs 0
> [/dev/sda1].read_io_errs 0
> [/dev/sda1].flush_io_errs 0
> [/dev/sda1].corruption_errs 0
> [/dev/sda1].generation_errs 0
Hard to say without a complete dmesg; but errno=-5 IO failure is
pretty much some kind of hardware problem in my experience. I haven't
seen it be a bug.
--
Chris Murphy
next prev parent reply other threads:[~2018-12-04 5:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-04 5:37 experiences running btrfs on external USB disks? Tomasz Chmielewski
2018-12-04 5:59 ` Chris Murphy [this message]
2018-12-04 6:13 ` Tomasz Chmielewski
2018-12-04 12:38 ` Austin S. Hemmelgarn
2018-12-04 13:37 ` Graham Cobb
2018-12-04 13:55 ` Austin S. Hemmelgarn
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