On Fri, 2017-01-20 at 18:24 +0900, Yasunori Goto wrote:
:
> >
> > Like mentioned before, this discussion is more about presentation
> > of errors in a known consumable format, rather than recovering from
> > errors. While recovering from errors is interesting, we already
> > have layers like RAID for that, and they are as applicable to
> > NVDIMM backed storage as they have been for disk/SSD based storage.
>
> I have one question here.
>
> Certainly, user can use LVM mirroring for storage mode of NVDIMM.
> However, NVDIMM has DAX mode.
> Can user use LVM mirroring for NVDIMM DAX mode?
> I could not find any information that LVM support DAX....
dm-linear and dm-stripe support DAX. This is done by mapping block
allocations to LVM physical devices. Once blocks are allocated, all
DAX I/Os are direct and do not go through the device-mapper layer. We
may be able to change it for read/write paths, but it remains true for
mmap. So, I do not think DAX can be supported with LVM mirroring.
This does not preclude hardware mirroring, though.
-Toshi
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