Re: [PATCH] BTT: Change nd_btt_arena_is_valid() to verify UUID

On Fri, 2015-12-18 at 09:54 -0800, Dan Williams wrote: > On Fri, Dec 18, 2015 at 7:15 AM, Toshi Kani <toshi.kani(a)hpe.com&gt; wrote: > > On Fri, 2015-12-18 at 01:34 -0700, Vishal Verma wrote: > > > Also, I wonder if this problem is solved by using libndctl to manage > > > BTTs. > > > > I have not tested with libndctl yet, but I think our bind/unbind > > scripts do the same procedures. > > We loop through all combinations of sector size in our unit test. If > you want to change the sector size the expectation is that the > namespace is destroyed and fully re-created, especially due to the > fact that changing sector size invalidates all data on the namespace. > > See: https://github.com/pmem/ndctl/blob/master/lib/test-libndctl.c The parent_uuid is not set on our NVDIMM-N systems. I do not see 'uuid' file under sysfs 'namespaceX.X' per namespace_visible(), either. This concept of creating/destroying a namespace is a bit foreign to us since we've never needed to do. Can you elaborate how it's supposed to work for NVDIMM-N?