Fwd: The Morning Paper: NOVA - A log-structured file system for hybrid volatile/non-volatile main memories

[Matthew Seaman]

On 08/05/2016 11:43, Lev Serebryakov wrote:
> Hello Poul-Henning,
> 
> Saturday, May 7, 2016, 7:38:21 PM, you wrote:
> 
>> Hybrid "disk with SSD cache" is a transitionary phenomena, it's
>> probably not going to be relevant in five years, which means
>> that it is almost already too late to develop a new filesystem
>> for it:  By the time the code is trustworthy, nobody will need
>> it any more.

>    Do you consider new Intel NVM "3D XPoint" technology? They(tm) promise
>  prices lower than DRAM, but higher than SSD. And same for speed. Looks
>  like, there will be THREE layers of NVM in near future: very large and slow
>  (HDD, iSCSI/FC attached "shelf", things like this, multiterabyte), SSD
>  (in 1-10 terabyte range) and this XPoint in current SSD range.

3D X-Point is only something like a factor of 30x slower than current
DRAM modules (which is to say thousands of times faster than existing
Flash modules), and I believe Intel are planning on selling it packaged
as DIMMs as well as PCIx NVME devices.

Kirk mentioned a memory-based variant of UFS in his run through of the
history of filesystems during his talk at EuroBSDCon last year -- looks
like that could suddenly become relevant again.

	Cheers,

	Matthew




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