vdev

Thought I would elicit some advice from the group regarding an upgrade I am working on. Current Setup: Synology 1812+ 4x8TB RAID5 + 845 DC Evo 960GB as read cache for Media Storage (The spinning drives will be repurposed for an offsite backup) 2x PM853t 960GB Raid1 for NFS ESXi and Docker...

This is on a production NAS so I want make double sure I am doing it right. 14 bay jbod Currently single raidz1-0 vdev with 7 disks and 2 spares. I want to take the 2 spares and 5 new disks and make a second vdev to increase space to max out my box. So my questions are these... Should I...