Redis on ram vs Redis on flash

[snehasish behera]

Redis on RAM vs Redis on Flash what are the advantages and disadvantages of both? Can anyone help me out please?

Thanks..

[David Maier]

Hi Snehasish,

Redis on Flash is a Redis Enterprise feature which allows using fast (e.g., NVMe Flash) drives as a RAM extension. This is especially useful for huge amounts of data and/or an access pattern that operates on a hot working set. Hot data is data that is very frequently accessed. In that sense, warm data is less often accessed and cold data is rarely accessed. Redis on Flash will then automatically keep warm and cold data on the Flash drive, which can save you infrastructure costs at near RAM performance.

In addition, both Redis on RAM and Redis on Flash can persist data to a persistent media (e.g., an SSD-backed SAN).

Further details can be found here: https://docs.redis.com/latest/rs/databases/redis-on-flash/

BTW: We usually don't use this mailing list to promote Redis Enterprise features. However, since you asked very directly about a Redis Enterprise feature, I thought it would make sense to reply directly in this thread.

Regards,

David