Replying to
@xrobau@mastodon.au
@xrobau@mastodon.au @LapTop006@aus.social SATA SSDs are unlikely to be fast enough to make good cache vdevs. I’d skip it unless you check your ARC stats and have less than a 99.5% hit rate.
https://infosec.exchange/@bob_zim/115465564078061185
And using a single SATA SSD for both cache and log at the same time will definitely hurt performance compared to just using the capacity devices.
A special vdev is more likely to improve performance, but it’s also risky, as it contains the filesystem structure itself (lose the special vdev, and you lose the tree telling the OS what data is where).