Posting this to get your ZFS related knowledge up. It helps if you use the correct terms for everything ZFS related as you will have to explain it to those who are not familiar.
BASICS
iX Systems pool layout whitepaper
Special VDEV (sVDEV) Planning, Sizing, and Considerations
SLOG is not a write cache. You only need it for sync writes. So databases, Block storage (iSCSI, zvols for VMs), and NFS.
