[dm-devel] [PATCH]multipath-tools: fix "multipath -ll" bug for Native NVME Multipath devices

[Martin Wilck]

On Fri, 2021-10-08 at 20:24 +0800, chengjike wrote:
> After "Native NVME Multipath" is configured,
> the content displayed is incorrect when you run "multipath -ll"
> command.
> Each NVME devices have the same path name. For example:
> 
> [root at localhost home]# multipath -ll
> eui.710032e8fb22a86c24a52c1000000db8 [nvme]:nvme1n1 NVMe,Huawei-
> XSG1,1000001
> size=10485760 features='n/a' hwhandler='ANA' wp=rw
> > -+- policy='n/a' prio=50 status=optimized
> > `- 1:4:1   nvme1c4n1 0:0 n/a   optimized live
> `-+- policy='n/a' prio=50 status=optimized
>   `- 1:9:1   nvme1c9n1 0:0 n/a   optimized live
> eui.710032e8fb22a86b24a52c7c00000db7 [nvme]:nvme1n2 NVMe,Huawei-
> XSG1,1000001
> size=10485760 features='n/a' hwhandler='ANA' wp=rw
> > -+- policy='n/a' prio=50 status=optimized
> > `- 1:4:1   nvme1c4n1 0:0 n/a   optimized live
> `-+- policy='n/a' prio=50 status=optimized
>   `- 1:9:1   nvme1c9n1 0:0 n/a   optimized live
> [root at localhost home]#
> 
> The logical paths of "nvme1n1" and "nvme1n2" are both "nvme1c4n1" and
> "nvme1c9n1".
> So when multipath-tools aggregates disks, use "nvme_ns_head-
> >instance" for matching.
> such as ,Use "b" in "nvmeanb" string to match "z" in
> "nvmexcynz"(a,b,x,y,z can be any number),
> and if "b" and "z" are the same, they are related.
> 
> Signed-off-by: chengjike <chengjike.cheng at huawei.com>

Reviewed-by: Martin Wilck <mwilck at suse.com>

Thanks!!