Date: Sun, 8 May 2016 11:56:00 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-fs@freebsd.org Subject: Re: Fwd: The Morning Paper: NOVA - A log-structured file system for hybrid volatile/non-volatile main memories Message-ID: <d88a8502-3db5-5a93-c0c9-21e35054e334@FreeBSD.org> In-Reply-To: <07228891.20160508134321@serebryakov.spb.ru> References: <4188b6afbe9e5d43111fef4d4ae5e599a57.20160506051425@mail23.atl91.mcsv.net> <2BE88161-D83A-4265-9EC3-C2F7F7033E93@neville-neil.com> <59877.1462639101@critter.freebsd.dk> <07228891.20160508134321@serebryakov.spb.ru>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --52WxEOuqfanQLgriumuJ1uH4h5HoxWdt9 Content-Type: multipart/mixed; boundary="S0019WSxuoFIWlr8Np2vdhKURpBeWRpiD" From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-fs@freebsd.org Message-ID: <d88a8502-3db5-5a93-c0c9-21e35054e334@FreeBSD.org> Subject: Re: Fwd: The Morning Paper: NOVA - A log-structured file system for hybrid volatile/non-volatile main memories References: <4188b6afbe9e5d43111fef4d4ae5e599a57.20160506051425@mail23.atl91.mcsv.net> <2BE88161-D83A-4265-9EC3-C2F7F7033E93@neville-neil.com> <59877.1462639101@critter.freebsd.dk> <07228891.20160508134321@serebryakov.spb.ru> In-Reply-To: <07228891.20160508134321@serebryakov.spb.ru> --S0019WSxuoFIWlr8Np2vdhKURpBeWRpiD Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 08/05/2016 11:43, Lev Serebryakov wrote: > Hello Poul-Henning, >=20 > Saturday, May 7, 2016, 7:38:21 PM, you wrote: >=20 >> 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) promi= se > 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 --S0019WSxuoFIWlr8Np2vdhKURpBeWRpiD-- --52WxEOuqfanQLgriumuJ1uH4h5HoxWdt9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQJ8BAEBCgBmBQJXLxtHXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ2NTNBNjhCOTEzQTRFNkNGM0UxRTEzMjZC QjIzQUY1MThFMUE0MDEzAAoJELsjr1GOGkATdLAP/RywGFEYOBvizjQyfpDfnm/z aj2ZK9Wv/AOmJql9CjJFpQHATcHJsoZLBj/ttqBevqxP1IWZuQXy8DYZfbLRYqHo qrP1N90qQchZBu4LxCA47sty9vh5gd+k+TdYJ0IOIvLdEOhbly2XSR+Y3OV9vu5L u8UwMJ5zcZ3T95UgXy+d3FUGYI982HgvdDNmc29obVPLDYPd8iBfJfNjoBPGNa5O 1Ik80mD65aaVjU7DtcPCT6igTPnQq7DpEXXvKhEikVNCreTFXLLdvUGo4VgJnN03 8iXaz/bG73YwGwGhuropOKPABIhoNdUXqX5OaPpaf0cZLKxcrfoygOR0KJNxCHm5 f/VnnISvwp6r8aREZRoWmdZVRfr6qI+ueth3v/8wHyadTnZGWdFzcHBvS3BQ2fP0 2mmlRCcV/DyTAQB/GcE07ZWD7CGC1oulHQXq2NCzyh/lF/HyDcAItZi/NQS7ogjF 0rOeulURv1kZKkfFU5+UFwhxfiTIFmmeb1VlE3H9VtkVd/OHJBVNBY/qJbnepnAn jn8YQzD8I9ImhENAuW6lM/z6Glz5NWQQeTUU6kbvMZUrTa4xi5avn2eTuGPnMAr4 e9Arf+pdbsetdvNsIfiPP0cY1LZIlEFk8njtgX+Ono4oCBkVP7BIRoFTO2+AYa4s P2coiAVOYAf1Ia7viCJW =IItI -----END PGP SIGNATURE----- --52WxEOuqfanQLgriumuJ1uH4h5HoxWdt9--
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