On Sun, Jan 31, 2016 at 8:42 PM, Tinker <ti...@openmailbox.org> wrote:
> Patrick, > > On 2016-02-01 07:10, Patrick Dohman wrote: > >> There is some hardware solution, e.g. Intel made the >>> >> >> http://ark.intel.com/products/70029/Intel-RAID-SSD-Cache-Controller-RCS25ZB04 >> 0LX using the "Nytro MegaRAID" chip. >> >>> >>> Someone would need to port its driver to OpenBSD. >>> >>> Also in the past there was a "Adaptec MaxIQ". Those are the only two >>> "Raid >>> >> controller cache" hardware solutions I am aware of, do you know any more? >> >>> >>> >>> >>> >> Some of the MegaRaid cards feature cache cade. >> > > Do you know any MegaRaid that a) supports that, b) is modern and not > archaic, and c) is supported by OpenBSD? > > Essentially disk cache is written to SSD before being âcopiedâ to spinning >> disk. >> > > I was mostly considering read acceleration. > > ( > >> Keep in mind DRAM based cache can improve performance when implemented in >> conjunction with hardware write back. >> > > Sure. > > Also magnetic disk & SSD with super cap / fault tolerant on disk cache can >> seed up I/O significantly.. >> > > Can you give a practical example of this? > ) > > Thanks, > Tinker > > Why can't the solution be all flash? $400 for 1 TB flash, * 7 sata ports on a decent $100 Motherboard, gets you 7TB of flash for under $3000
