[SPDK] Re: Spdk nvme CLI - block device

Hi SPDK team

I am trying to configure SPDK  Nvme over tcp with ADQ.

Can anyone guide me on that.

Any help will be appreciated.

Thank you
Revan Biradar

On Mon, Apr 6, 2020 at 8:44 PM Zawadzki, Tomasz <tomasz.zawadzki(a)intel.com>
wrote:

> Hello Gili,
>
> If I understand correctly the goal is to prepare data on a bdev before
> exposing it via NVMe-oF (or other targets - vhost/iSCSI) ?
>
> One way would be to connect to SPDK target with kernel initiator - even
> locally within single machine.
> Then perform necessary preparation using already available tooling.
> As you've noted it is possible to create device in kernel from bdev using
> NBD as well.
>
> Please see https://spdk.io/doc/bdev.html and appropriate target
> documentation to help with set of RPCs that might help.
>
> Note:
> nvme CLI is not needed to configure SPDK target or SPDK initiator, this
> can be done via RPC.
> Branch spdk-1.6 for nvme CLI was created to interact with NVMe bdevs in
> SPDK. Which since has been improved to work
> with stock nvme CLI when using
> https://spdk.io/doc/bdev.html#bdev_config_nvme_cuse
>
> Thanks,
> Tomek
>
> > -----Original Message-----
> > From: Gili Buzaglo <Gili.Buzaglo(a)kioxia.com>
> > Sent: Saturday, April 4, 2020 11:59 AM
> > To: spdk(a)lists.01.org
> > Subject: [SPDK] Spdk nvme CLI - block device
> >
> > Hi
> > I tried to understand if nvme CLI based on spdk-1.6 can somehow generate
> a
> > block device without using the nvme fabrics kernel module.
> > I managed to add tcp support and connect ,but then the code goes to the
> > kernel module and no block device was added.
> > In general , I know that it is possible to create block devices which are
> > implemented in user space (for example with nbd) .. and I know spdk has
> > block device layer..
> > Does someone think that what I did is somehow possible ?
> >
> > The motivation for this is easy host installation without the
> requirement to
> > replace kernel or application changes.
> > I'm aware there will be a performance impact..
> >
> > Thanks
> > -gili
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