> > Persistent backend setup requires some knowledge about nvdimm and ndctl > tool. Some users report they may struggle to gather these knowledge and > have difficulty to setup it properly. > > Here we provide two examples for persistent backend and gives the link > to ndctl. By doing so, user could try it directly and do more > investigation on persistent backend setup with ndctl. > > Signed-off-by: Wei Yang <richardw.y...@linux.intel.com> > --- > docs/nvdimm.txt | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/docs/nvdimm.txt b/docs/nvdimm.txt > index b531cacd35..baba7a940d 100644 > --- a/docs/nvdimm.txt > +++ b/docs/nvdimm.txt > @@ -171,6 +171,32 @@ guest software that this vNVDIMM device contains a > region that cannot > accept persistent writes. In result, for example, the guest Linux > NVDIMM driver, marks such vNVDIMM device as read-only. > > +Backend File Setup Example > +.......................... > + > +Here is two examples for how to setup these persistent backend on > +linux, which leverages the tool ndctl [3]. > + > +It is easy to setup DAX device backend file. > + > +A. DAX device > + > + ndctl create-namespace -f -e namespace0.0 -m devdax > + > +The /dev/dax0.0 could be used directly in "mem-path" option. > + > +For DAX file, it is more than creating the proper namespace. The > +block device should be partitioned and mounted (with dax option). > + > +B. DAX file > + > + ndctl create-namespace -f -e namespace0.0 -m fsdax > + (partition /dev/pmem0 with name pmem0p1) > + mount -o dax /dev/pmem0p1 /mnt > + (dd a file with proper size in /mnt)
This is not clear to me. why 'dd' file is required in /mnt? You mean for creating a backend file? > + > +Then the new file in /mnt could be used in "mem-path" option. > + > NVDIMM Persistence > ------------------ > > @@ -212,3 +238,5 @@ References > > https://www.snia.org/sites/default/files/technical_work/final/NVMProgrammingModel_v1.2.pdf > [2] Persistent Memory Development Kit (PMDK), formerly known as NVML > project, home page: > http://pmem.io/pmdk/ > +[3] ndctl-create-namespace - provision or reconfigure a namespace > + http://pmem.io/ndctl/ndctl-create-namespace.html > -- Looks good to me. Just a small comment above. Other than that: Reviewed-by: Pankaj Gupta <pagu...@redhat.com> > 2.17.1 > > >
