Looks like something in unRAID 6.9.2 is resulting in drives not spinning down. Even trying to manually spin down doesn't help. Here's the Tools > System Log   Apr  8 08:12:12 cobblednas emhttpd: spinning down /dev/sde Apr  8 08:12:12 cobblednas emhttpd: spinning down /dev/sdi Apr  8 08:12:12 cobblednas SAS Assist v0.85: Spinning down device /dev/sde Apr  8 08:12:12 cobblednas SAS Assist v0.85: Spinning down device /dev/sdi Apr  8 08:12:33 cobblednas emhttpd: read