On Fri, Feb 15, 2019 at 1:57 AM Johannes Thumshirn <jthumshirn@xxxxxxx> wrote: > > (This is a joint proposal with Hannes Reinecke) > > Servers with NV-DIMM are slowly emerging in data centers but one key feature > for reliability of these systems hasn't been addressed up to now, data > redundancy. > > While it would be best to solve this issue in the memory controller of the CPU > itself, I don't see this coming in the next few years. This puts us as the OS > in the burden to create the redundant copies of data for the users. > > If we leave of the DAX support Linux' software RAID implementations (MD, > device-mapper and BTRFS RAID) do already work on top of pmem devices, but they > are incompatible with DAX. > > In this session Hannes and I would like to discuss eventual ways how we as an > operating system can mitigate these issues for our users. One feature request I have heard in this space is to at least have filesystem metadata redundancy for DAX. For applications that can handle their own data-replication the single-point-of-failure FS metadata becomes a larger liability.
