On Wednesday, 26 September 2018 1:38:15 PM AEST John Hearns via Beowulf wrote:
> I had a look at the Intel pages on Optane memory. It is definitely > being positioned as a fast file cache, ie for block oriented devices. Interestingly there was a (non-block device) filesystem presented this year called NOVA targeting these sorts of NVMM devices. LWN has a nice little article on it (which in turn links to earlier articles on it, and the original paper). https://lwn.net/Articles/754505/ It's still going through rapid development and (learning from the btrfs experience) the kernel folks aren't going to let it in without a working fsck from the sound of things. There's also some NVDIMM documentation in the kernel tree which is pretty heavy going, I've just tried to skim it and I think I know less now than when I started. ;-) https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/nvdimm/nvdimm.txt There's also the more readable documentation for the "block translation table" which seems to be intended to provide a way to give some atomicity to storage transactions to NVDIMMs which are not present given the nature of the hardware: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/nvdimm/btt.txt There is also the persistent memory wiki: https://nvdimm.wiki.kernel.org/ > This worked by tiering RAM memory - ie a driver in the Linux > kernel would move little used pages to the slower but higher capacity > device. > I though the same thing would apply to Optane, but it seems not. Well the simplest way to get what you describe there might be to use the Optane as a swap partition. :-) Red Hat have some docs about using NVDIMMs. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-persistent-memory-nvdimms Not sure I helped much there! :-) All the best, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
