[dm-devel] : Multipath Setup for NVMe over Fabric

[Martin Wilck]

On Wed, 2017-04-12 at 14:50 +0530, Ankur Srivastava wrote:
> Hi All, 
> 
> I am working on NVMe over fabric and want to experiment the
> Multipathing support for the same.
> 
> Setup Info:
> RHEL 7.2 with Kernel 4.9.3
> 
> 
> [root at localhost ~]# nvme list
> Node             SN                   Model                          
>                 Namespace Usage                      Format          
> FW Rev
> ---------------- -------------------- -----------------------------
> ----------- --------- -------------------------- ---------------- -
> -------
> /dev/nvme0n1     30501b622ed15184     Linux                          
>          10        268.44  GB / 268.44  GB    512   B +  0 B   4.9.3
> /dev/nvme1n1     ef730272d9be107c      Linux                        
>            10        268.44  GB / 268.44  GB    512   B +  0 B  
> 4.9.3
> 
> 
> [root at localhost ~]# ps ax | grep multipath
> 1272 ?        SLl    0:00 /sbin/multipathd
> 
> 
> I have connected my Initiator to both the ports of Ethernet
> Adapter(Target) to get 2 IO Paths, from the above data "/dev/nvme0n1"
> is path 1 and "/dev/nvme1n1" is path 2 for the same namespace.
> 
> Note: I am using Null Block device on the Target Side.
> 
> But still the multipath is showing an error ie no path to Host for
> All the NVMe Drives mapped on the Initiator. Does multipathd supports
> NVMe over Fabric ??
> Or what I am missing from configuration side ??

I don't have any practical experience with NVMeoF, but you certainly
need a recent upstream multipath-tools version to make it work.

Regards
Martin

-- 
Dr. Martin Wilck <mwilck at suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
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