RAID, RAM and Cache

[nmarmon]

Hi,

I would like to know if it is possible to use part of the RAM of a motherboard as a cache of a RAID controller. It may sound a little absurd, but I've seen RAID cards out there that apparently have not, and I wondered if they were pulling RAM.

Another question I have is if, for that, said motherboard must have integrated RAID. Maybe someone will take their hands to the head, who apologizes for my ignorance.

Thanks for answering. Regards.

 

[wblock]

ZFS uses the main memory as cache. This is superior to a tiny little hardware RAID controller due to the more powerful processor, more RAM, and ZFS's knowledge of which blocks on a disk are actually in use.

Using separate hardware RAID controllers or "motherboard RAID" is not recommend.

 

[Ericloewe]

Regarding hardware requirements:
https://forums.freenas.org/index.php?resources/hardware-recommendations-guide.12/