: Multipath Setup for NVMe over Fabric

: Multipath Setup for NVMe over Fabric

[Ankur Srivastava]

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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@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@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 ??

Thanks in advance!!


BR~
Ankur

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Re: : 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@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@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@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

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