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 -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
