Re: USB upgrade fun

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2017年10月28日 15:03, Kai Hendry wrote:
> On Fri, 13 Oct 2017, at 09:42 AM, Kai Hendry wrote:
>> It probably is... since when I remove my new 4TB USB disk from the
>> front, I am at least able to mount my two 2x2TB in degraded mode and see
>> my data!
> 
> Just a follow up. I have not been of late been able to mount my data,
> even in degraded mode.
> 
> However someone on #btrfs suggested I try an older Linux kernel & I also
> found https://www.spinics.net/lists/linux-btrfs/msg69905.html to
> reaffirm my suspicions.
> 
> Low and behold I can mount with an older kernel
> (linux-4.4.3-1-x86_64.pkg.tar.xz) !! But if I reboot into 4.13.9-1-ARCH,
> no worky:
> 
> [  489.139903] BTRFS warning (device sdb1): devid 3 uuid
> e5f03f81-35e7-4a29-9608-bd78864cc0ad is missing
> [  489.524334] BTRFS info (device sdb1): bdev (null) errs: wr 0, rd 1,
> flush 0, corrupt 0, gen 0
> [  489.524367] BTRFS info (device sdb1): bdev /dev/sdb1 errs: wr 13361,
> rd 31990017, flush 155, corrupt 0, gen 0
> [  502.934069] BTRFS warning (device sdb1): missing devices (1) exceeds
> the limit (0), writeable mount is not allowed
> [  502.980748] BTRFS error (device sdb1): open_ctree failed
> 
> 
> Does anyone know how I can track the progress of "--fix-dev-size"? It
> doesn't seem part of btrfs-progs 4.13-1...
> 
Didn't follow the whole thread, so I can't say much about the original
problem.

But concerning "--fix-dev-size", it's not merged into mainline yet.
So if you really want to try it, you could use the out-of-tree btrfs-progs:
https://github.com/adam900710/btrfs-progs/tree/check_unaligned_dev

Don't get confused with the name, to use "fix-dev-size" you need to run
"btrfs rescue fix-dev-size"

However, according to your kernel message, it seems that you're missing
one device, in which case "fix-dev-size" can't handle yet.

So I'm afraid it can't help much for your case.

Thanks,
Qu


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