Re: [SPDK] BDEV & VBDEV

[Daniel Verkamp <daniel.verkamp at intel.com>]

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On 10/21/2016 10:59 AM, Kumaraparameshwaran Rathnavel wrote:
> Thanks Daniel.  So in the virtual subsystem the example in the tree is malloc devices.  So instead of that I can create my own subsystem like malloc devices right. Is there support for virtual subsystem from end to end . Say that when I get a read command from kernel initiator the SPDK reads the data n then sends it back to the initiator
>
> Thanking you,
> Param

The nvmf_tgt "Virtual" mode (use bdevs as namespaces) is an alternative 
to "Direct" mode (expose hardware NVMe device directly).  It is 
unrelated to the virtual blockdev layering mechanism.  Any blockdev 
(regular bdev or vbdev) can be used as a namespace in nvmf_tgt Virtual mode.

I'm not sure if I understand the rest of the question - can you 
elaborate on what you are trying to accomplish?

Thanks,
-- Daniel