On Thu, 13 Nov 2014, Thomas Lemarchand wrote:
> Hi Ceph users,
>
> I need to have different filesystem trees in different pools, mainly for
> security reasons.
>
> So I have ceph users (cephx) with specific access on specific pools.
>
> I have one metadata pool ('metadata') and tree data pools ('data',
> 'wimi-files, 'wimi-recette-files').
>
> I used file layouts ( http://ceph.com/docs/master/cephfs/file-layouts/ )
> to associate directories with pools.
>
> My filesystem looks like that :
> Path -> associated pool
>
> / -> data
> /prod -> wimi-files
> /prod/... -> wimi-files
> /recette -> wimi-recette-files
> /recette/... -> wimi-recette-files
>
> Is it the best way to achieve what I need, since it's not possible to
> have multiple CephFS on a Ceph cluster ?
>
> I ask this because my 'rados df' seems strange to me :
>
> pool name category KB objects clones
> degraded unfound rd rd KB wr wr
> KB
> data - 0 9045499 0
> 0 0 434686 434686 9294004 0
> metadata - 58591 52681 0
> 0 0 2168219 2403048804 16461385 180433628
> wimi-files - 9006435331 10169214 0
> 0 0 296284 2747513 19225407 9064999231
> wimi-recette-files - 1036224 309167
> 0 0 0 345223 1401472 658388
> 1170762
> total used 27404544372 19576561
> total avail 78033398196
> total space 105437942568
>
> As you can see, there are 9045499 objects in 'data' pool, while there
> are only two directories ( 'prod', 'recette' ), and not a single file in
> this pool.
>
> Anyone know how this works ?
The MDS puts backtrace objects in the base data pool in order to
facilitate fsck and lookup by ino even when the data is stored elsewhere.
Other strategies that don't do this are possible, but they're more
complicated, and we opted to keep it as simple as possible for now.
sage
>
> Thanks in advance !
>
> Regards
> --
> Thomas Lemarchand
> Cloud Solutions SAS - Responsable des syst?mes d'information
>
>
>
>
>
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