You have to make sure to set the label size as the same size as the
minimum alignment required. For QEMU emulation I found it to be 2M, and,
in this case, you can correctly work with 2 or more nvdimms. With proper
alignment, you can also re-create namespaces - of other mode like devdax
or fsdax - if you already have a namespace working.
Example:
<!-- nvdimm node 0 -->
<memory model='nvdimm' access='shared'>
<source>
<path>$_nvpath1</path>
</source>
<target>
<size unit='KiB'>1048576</size>
<node>0</node>
<label>
<size unit='KiB'>2048</size>
</label>
</target>
<address type='dimm' slot='0'/>
</memory>
<!-- nvdimm node 1 -->
<memory model='nvdimm' access='shared'>
<source>
<path>$_nvpath2</path>
</source>
<target>
<size unit='KiB'>1048576</size>
<node>1</node>
<label>
<size unit='KiB'>2048</size>
</label>
</target>
<address type='dimm' slot='1'/>
</memory>
So I'm closing this as NOT A BUG as the alignment can be configured
accordingly.
For other examples you can check autopkgtests being proposed as a merge
request at:
https://bugs.launchpad.net/ubuntu/+source/ndctl/+bug/1853506
** Changed in: ndctl (Ubuntu Focal)
Status: Confirmed => Invalid
** Changed in: qemu (Ubuntu Focal)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1855177
Title:
QEMU emulated nvdimm regions alignment need (128MB) or ndctl create-
namespace namespace1.0 might fail
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