On 11/02/2012 08:05 PM, Gabriel wrote:
> On Fri, 02 Nov 2012 13:02:32 +0100, Goffredo Baroncelli wrote:
>> On 2012-11-02 12:18, Martin Steigerwald wrote:
>>> Metadata, DUP is displayed as 3,50GB on the device level and as 1,75GB
>>> in total. I understand the logic behind this, but this could be a bit
>>> confusing.
>>>
>>> But it makes sense: Showing real allocation on device level makes
>>> sense,
>>> cause thats what really allocated on disk. Total makes some sense,
>>> cause thats what is being used from the tree by BTRFS.
>>
>> Yes, me too. At the first I was confused when you noticed this
>> discrepancy. So I have to admit that it is not so obvious to understand.
>> However we didn't find any way to make it more clear...
>>
>>> It still looks confusing at first…
>> We could use "Chunk(s) capacity" instead of total/size ? I would like an
>> opinion from a "english people" point of view..
>
> This is easy to fix, here's a mockup:
>
> Metadata,DUP: Size: 1.75GB ×2, Used: 627.84MB ×2
> /dev/dm-0 3.50GB
>
> Data Metadata Metadata System System
> Single Single DUP Single DUP Unallocated
>
> /dev/dm-16 1.31TB 8.00MB 56.00GB 4.00MB 16.00MB 0.00
> ====== ======== =========== ====== =========== ===========
> Total 1.31TB 8.00MB 28.00GB ×2 4.00MB 8.00MB ×2 0.00
> Used 1.31TB 0.00 5.65GB ×2 0.00 152.00KB ×2
Nice idea. Even tough I like the opposite:
Data Metadata Metadata System System
Single Single DUP Single DUP Unallocated
/dev/dm-16 1.31TB 8.00MB 28.00GB x2 4.00MB 8.00MB x2 0.00
====== ======== =========== ====== =========== ===========
Total 1.31TB 8.00MB 28.00GB 4.00MB 8.00MB 0.00
Used 1.31TB 0.00 5.65GB 0.00 152.00KB
However how your solution will became when RAID5/RAID6 will arrive ? mmm
may be the solution is simpler: the "x2" factor is applied only to DUP
profile. The other profiles span different disks.
As another option, we can add a field/line which reports the RAID factor:
Metadata,DUP: Size: 1.75GB, Used: 627.84MB, Raid factor: 2x
/dev/dm-0 3.50GB
Data Metadata Metadata System System
Single Single DUP Single DUP Unallocated
/dev/dm-16 1.31TB 8.00MB 56.00GB 4.00MB 16.00MB 0.00
====== ======== ======== ====== ======== ===========
Raid factor - - x2 - x2 -
Total 1.31TB 8.00MB 28.00GB 4.00MB 8.00MB 0.00
Used 1.31TB 0.00 5.65GB 0.00 152.00KB
>
> Also, I don't know if you could use libblkid, but it finds more
> descriptive names than dm-NN (thanks to some smart sorting logic).
I don't think that it would be impossible to use libblkid, however it
would be difficult to find spaces for longer device name
>
>
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