Re: Btrfs balance invalid argument error

[Andreas Philipp <philipp.andreas@gmail.com>]

On 05/10/2013 11:46 PM, Hugo Mills wrote:
> On Fri, May 10, 2013 at 11:43:34PM +0200, Marcus Lövgren wrote:
>> Yes, you were right! Adding another drive to the array made it continue
>> without errors. Is this already reported as a bug?
>
>    I believe it has been, yes. I think we've even had a patch out for
> it. I haven't looked to see if it's got into 3.10.
>
Yes, there is a patch but as far as I've seen it didn't hit 3.10 (yet).
I'll repost it immediately.

Thanks for reminding me on that,
Andreas

>    Hugo.
>
>> Thanks for the help,
>> Marcus
>>
>>
>> 2013/5/10 Remco Hosman - Yerf IT <remco@yerf-it.nl>
>>
>>> On May 10, 2013, at 10:21 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
>>>
>>>> On Fri, May 10, 2013 at 10:07:56PM +0200, Marcus Lövgren wrote:
>>>>> Hi list,
>>>>>
>>>>> I am using kernel 3.9.0, btrfs-progs 0.20-rc1-253-g7854c8b.
>>>>>
>>>>> I have a three disk array of level single:
>>>>>
>>>>> # btrfs fi sh
>>>>> Label: none  uuid: 2e905f8f-e525-4114-afa6-cce48f77b629
>>>>>        Total devices 3 FS bytes used 3.80TB
>>>>>        devid    1 size 2.73TB used 2.25TB path /dev/sdd
>>>>>        devid    2 size 2.73TB used 1.55TB path /dev/sdc
>>>>>        devid    3 size 2.73TB used 0.00 path /dev/sdb
>>>>>
>>>>> Btrfs v0.20-rc1-253-g7854c8b
>>>>>
>>>>> # btrfs fi df /mnt/data
>>>>> Data: total=3.79TB, used=3.79TB
>>>>> System: total=4.00MB, used=420.00KB
>>>>> Metadata: total=6.01GB, used=4.87GB
>>>>>
>>>>>
>>>>> When running
>>>>> # btrfs balance start -dconvert=raid5 -mconvert=raid5 /mnt/data
>>>>>
>>>>> I get
>>>>>
>>>>> ERROR: error during balancing '/mnt/data' - Invalid argument
>>>>> There may be more info in syslog - try dmesg | tail
>>>>>
>>>>> dmesg | tail says:
>>>>>
>>>>> btrfs: unable to start balance with target data profile 128
>>>>>
>>>>> Isn't it possible to convert raid level to raid5?
>>>>
>>>>   Yes, it should be possible. It looks like the kernel's got a
>>>> problem with it, which is odd because 3.9 should know about RAID-5.
>>>>
>>>
>>> Wasn't there some issues that the kernel or tools wanted 4 disks when
>>> converting to raid5?
>>>
>>> Remco
>>>
>>>>   Hugo.
>>>>
>