Re: multiple --name parameters with non-file engine?

[Jens Axboe <axboe@kernel.dk>]

On 2014-08-18 19:42, Mark Nelson wrote:
> Hi Guys,
>
> I'm using the librbd engine and trying to determine what exactly happens
> when multiple --name parameters are passed.  Primarily, I'm wondering if
> each fio process ends up writing to the same blocks on the rbd volume
> during sequential writes.  Looking at the code, I see a note that we
> pretend to deal with files even if the engine doesn't understand the
> concept of files:
>
> https://github.com/axboe/fio/blob/master/engines/rbd.c#L405
> https://github.com/axboe/fio/blob/master/filesetup.c#L1239
>
> I'm not seeing anything (might be missing it) in the rbd engine or there
> that would partition the volume based on the process though.  Am I
> missing anything?

The same thing will happen as if you ran two instances of fio with the 
same options. For rbd, each job will create/connect/open and rbd 
instance. For each of these, you can set the rbd pool and clientname.

-- 
Jens Axboe