Does it make sense use SSD for ZFS log or cache?

only make sense for enterprise NAS, for home use, you do not notice improvements.

Zitat von d13m

I read many posts on reddit someone is telling that use cache no sense, someone that need to use SSD for log only, someone that for cache only...

Does it make sense?

If you're NAS workload generates a lot of "sync writes" and you don't want to use sync=disabled on your zfs pool, then a SSD slog device may be beneficial. But picking the right kind of SSD is essential, it needs to have power loss protection, low latency and high endurance.

The case for using a cache device on a zfs pool again depends of the type of workload and in general the advice is to max out memory first.

Zitat von d13m

I have only 12GB of ram and thought maybe adding disk for cache and log will help me to free ram or something else. Here is I mentioned what pools I have RE: Information about ZFS cache and hitrate

BTW: I have UPS and if no electricity via UPS plugin OMV will be turned off in 3 minutes.

d13m For a better understanding of ARC and L2ARC and SLOG you might find these refs of use:

OpenZFS - The Final Word in File Systems

OpenZFS - The Final Word in File Systems

The docs are not TrueNAS specific.