Re: Data single *and* raid?

[Hendrik Friedel <hendrik@friedels.name>]

Hello Hugo,
hello Chris,

thanks for your advice. Now I am here:
btrfs balance start -dprofiles=single -mprofiles=raid1 /mnt/__Complete_Disk/
Done, had to relocate 0 out of 3939 chunks


root@homeserver:/mnt/__Complete_Disk# btrfs fi show
Label: none  uuid: a8af3832-48c7-4568-861f-e80380dd7e0b
         Total devices 3 FS bytes used 3.78TiB
         devid    1 size 2.73TiB used 2.72TiB path /dev/sde
         devid    2 size 2.73TiB used 2.23TiB path /dev/sdc
         devid    3 size 2.73TiB used 2.73TiB path /dev/sdd

btrfs-progs v4.1.1


So, that looks good.

But then:
root@homeserver:/mnt/__Complete_Disk# btrfs fi df /mnt/__Complete_Disk/
Data, RAID5: total=3.83TiB, used=3.78TiB
System, RAID5: total=32.00MiB, used=576.00KiB
Metadata, RAID5: total=6.46GiB, used=4.84GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

Is the RAID5 expected here?
I did not yet run:
btrfs balance start -dconvert=raid5,soft -mconvert=raid5,soft 
/mnt/new_storage/

Regards,
Hendrik


On 01.08.2015 22:44, Chris Murphy wrote:
> On Sat, Aug 1, 2015 at 2:32 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
>> On Sat, Aug 01, 2015 at 10:09:35PM +0200, Hendrik Friedel wrote:
>>> Hello,
>>>
>>> I converted an array to raid5 by
>>> btrfs device add /dev/sdd /mnt/new_storage
>>> btrfs device add /dev/sdc /mnt/new_storage
>>> btrfs balance start -dconvert=raid5 -mconvert=raid5 /mnt/new_storage/
>>>
>>> The Balance went through. But now:
>>> Label: none  uuid: a8af3832-48c7-4568-861f-e80380dd7e0b
>>>          Total devices 3 FS bytes used 5.28TiB
>>>          devid    1 size 2.73TiB used 2.57TiB path /dev/sde
>>>          devid    2 size 2.73TiB used 2.73TiB path /dev/sdc
>>>          devid    3 size 2.73TiB used 2.73TiB path /dev/sdd
>>> btrfs-progs v4.1.1
>>>
>>> Already the 2.57TiB is a bit surprising:
>>> root@homeserver:/mnt# btrfs fi df /mnt/new_storage/
>>> Data, single: total=2.55TiB, used=2.55TiB
>>> Data, RAID5: total=2.73TiB, used=2.72TiB
>>> System, RAID5: total=32.00MiB, used=736.00KiB
>>> Metadata, RAID1: total=6.00GiB, used=5.33GiB
>>> Metadata, RAID5: total=3.00GiB, used=2.99GiB
>>
>>     Looking at the btrfs fi show output, you've probably run out of
>> space during the conversion, probably due to an uneven distribution of
>> the original "single" chunks.
>>
>>     I think I would suggest balancing the single chunks, and trying the
>> conversion (of the unconverted parts) again:
>>
>> # btrfs balance start -dprofiles=single -mprofile=raid1 /mnt/new_storage/
>> # btrfs balance start -dconvert=raid5,soft -mconvert=raid5,soft /mnt/new_storage/
>>
>
> Yep I bet that's it also. btrfs fi usage might be better at exposing this case.
>
>


-- 
Hendrik Friedel
Auf dem Brink 12
28844 Weyhe
Tel. 04203 8394854
Mobil 0178 1874363

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