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Windows obtains the removability status from the hardware, so I'd suggest checking the documentation for the HBA to see if there's a internal setting or manufacturer utility to mark the drives/buses as hot-pluggable. (There did indeed used to be such a key and yeah Microsoft removed it for their ineffable reasons.) You might also try this piece of software http://mt-naka.com/hotswap/index_enu.htm as it does have command line functionality - but it may not support your hardware. Also, disclaimer, I haven't tried it myself; proceed with caution.

Did some looking. AFAICT there's no official DP method (command-line or GUI) to gracefully offline a pool. Tagging @Christopher (Drashna) ? What I have so far found seems to work, with a bit of experimentation today, was the following: 1. Ensure that all relevant poolpart volumes appear to Windows as ejectable drives, then set the override for CoveFs_IsDiskRemovable to true and restart Windows; the pool drive composed from those volumes should now itself show up as an ejectable drive (but doing so via the Windows GUI will just have DrivePool immediately redetect and remount the pool). 2. In your batch file the command diskpart /s scriptfile.txt should now* be usable to take the pool offline where scriptfile.txt is the name of the file containing the following text (replacing pooldriveletter with the letter of your pool drive): SELECT VOLUME pooldriveletter OFFLINE VOLUME 3. If the command was successful then the errorlevel for the diskpart command should be zero (if you need to check for that in your script) and the designated pool should gracefully disappear from DrivePool; you should then be able to eject / depower the relevant physical drives. I might still recommend using DrivePool_RunningFile to ensure that DrivePool isn't in the middle of any maintenance operations, as I don't know if interrupting those in this manner would cause DrivePool to want to recheck the pool, but if you find it doesn't then I guess it won't be needed! How are you scripting the JBODs to power on/off? *I found that using diskpart to offline a non-removable pool drive would sometimes crash diskpart/drivepool/windows so I don't recommend trying that.