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 “copied” 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
